TYPES OF GERMINATION
Practical Activity - To investigate epigeal and hypogeal germination
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GROWTH AND DEVELOPMENT IN PLANTS
The main growth and development phase in plants begins with the germination of the mature seed. Seeds are of two kinds depending on the number of cotyledons or embryo leaves.
STRUCTURE OF THE SEED
Dormancy in Seeds
Factors that Cause Dormancy
Ways of Breaking Dormancy
Conditions Necessary for Germination
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ROLE OF PLACENTA
The placenta facilitates the transfer of nutrients from maternal blood to foetus.
Placenta facilitates the removal of nitrogenous wastes from the foetus' blood to maternal blood.
Oxygen from the maternal blood diffuses into the foetal blood while carbon (IV) oxide from foetal blood diffuse into maternal blood.
Production of hormones
Placenta produces progesterone and oestrogen.
The period between conception and birth is called gestation.
In humans gestation takes nine months (40 weeks).
The embryo differentiates into tissues and organs during this period.
Week 1 to 3:
Zygote divides to form blastocyst.
Implantation takes place.
The three germ layers form endoderm, mesoderm and ectoderm.
Nervous system starts to form.
Week 4 to 7:
Development of circulating and digestive systems.
Further development of nervous system, formation of sensory organs,
All major internal organs are developed.
At week 5, heartbeat starts.
Week 8 to 24:
All organs well developed including sex organs.
Hair, finger and toe nails grow.
Foetus move and eyelids open.
Week 25- 30:
The fully developed foetus responds to touch and noises and moves vigorously.
The head turns and faces downwards ready for birth.
Foetus increases in size.
Examining the stages of mitosis
To examine spores on sori of ferns
Dispersal of fruits and seeds
What is Measurement of Growth?
Growth can be estimated by measuring some aspect of the organism such as height, weight, volume and length over a specified period of time. The measurements so obtained if plotted against time result into a growth curve.
The following results were obtained from a study of germination and early growth of maize.
The grains were sown in soil in a greenhouse and.at two-day intervals. Samples were taken, oven dried and weighed. See table.
Plot a graph of dry mass of embryo against time after sowing.
Describe the shape of the graph.
For most organisms when the measurements are plotted they give an S-shaped graph called a sigmoid curve such as in figure. This pattern is due to the fact that growth tends to be slow at first and then speeds up and finally slows down as adult size is reached. A sigmoid curve may therefore be divided into four parts.
Lag phase (slow growth)
This is the initial phase during which little growth occurs. The growth rate is slow due to various factors namely:
Exponential phase (log phase)
This is the second phase during which growth is rapid or proceeds exponentially. During this phase the rate of growth is at its maximum and at any point, the rate of growth is proportional to the amount of material or numbers of cells of the organism already present.
This rapid growth is due to:
This is the third phase during which time growth becomes limited as a result of the effect of some internal or external factors, or the interaction of both.
The slow growth is due to:
Plateau (stationary) phase
This is the phase which marks the period where overall growth has ceased and the parameters under consideration remain constant.
This is due to the fact that:
PRACTICAL ACTIVITY I: PROJECT
To measure the growth of a plant
Small plots/boxes, meter rule and seeds of beans (or green grams, peas, maize),
Reproduction in Animals
Reproduction in Humans
Structure of female reproduction system,
The female reproduction system consist of the following: Ovaries
Structure of male reproductive system
The male reproductive system consists of the following:
Fertilisation in Animals
Growth is a characteristic feature of all living organisms.
Most multi cellular organisms start life as a single cell and gradually grow into complex organisms with many cells. This involves multiplication of cells through the process of cell division.
This quantitative permanent increase in size of an organism is referred to as growth.
For growth to take place the following aspects occur
In flowering plants, the flower is the reproductive organ which is a specialised shoot consisting of a modified stem and leaves. The stem-like part is the pedicel and receptacle, while modified leaves form corolla and calyx.
Structure and functions of parts of named insect and wind pollinated flowers
Structure of a flower
A typical flower consists of the following parts:
Made up of sepals.
They enclose and protect the flower when it is in a bud. Some flowers have an outer whorl made of sepal-like structures called epicalyx.
Consists of petals. The petals are brightly coloured in insect - pollinated flowers.
This is the male part of the flower, it consists of stamens. Each stamen consists of a filament whose end has an anther. Inside the anther are pollen sacs which contain pollen grains.
It is the female part of the flower, it consists of one or more carpels. Each carpel consists of an ovary, a sty le and a stigma. The ovary contains ovules which become seeds after fertilisation.
A monocarpous pistil has one carpel e.g. Beans, a polycarpous pistil has many carpels. If the carpes are free, it is called apocarpous as in rose and Bryophyllum, in carpels that are fused it is called syncarpous as in Hibiscus.
A complete flower has all the four floral parts, a regular flower can be divided into two halves by any vertical section passing through the centre. E.g. morning glory. Irregular flower can be divided into two halves in only one plane e.g. crotalaria.
Pollination and agents of pollination
This is the transfer of pollen grains from the anther to the stigma.
Types of pollination
Self-pollination is the transfer of pollen grains from the anther of one flower to the stigma of the same flower.
Cross-pollination is the transfer of pollen grains from the anther of one flower to the stigma of a different flower, of the same species.
Agents of pollination
Agents of pollination include wind, insects, birds and mammals.
Insect pollinators include bees, butterflies and mosquitoes.
Features and mechanisms that hinder self-pollination and self-fertilization
The process of fertilization
Fertilisation in Plants
The pollen grain contains the generative nucleus and a tube nucleus. When the pollen grain lands on the stigma, it absorbs nutrient and germinates forming a pollen tube. This pollen tube grows through the style pushing its way between the cells thus getting nourishment from these cells.
The tube nucleus occupies the position at the tip of the growing pollen tube. The generative nucleus follows behind the tube nucleus, and divides to form two male gamete nuclei. The pollen tube then enters the ovule through the micropyle.
When the pollen tube penetrates the ovule disintegrates and the pollen tube bursts open leaving a clear way for the male nuclei. One male nucleus fuses with the egg cell nucleus to form a diploid zygote which develops into an embryo. The other male gamete nucleus fuses with the polar nucleus to form a triploid nucleus which forms the primary endosperm. This is called double fertilisation.
After fertilisation the following changes take place in a flower:
Fruit and seed formation and dispersal
Fruit development without fertilisation is called parthenocarpy e.g. as in pineapples and bananas.Such fruits do not have seeds.
Classification of fruits
This is the arrangement of the ovules in an ovary.
The placenta appears as one ridge on the ovary wall e.g. bean.
The placenta is on the ridges on ovary wall.
Ovules are in them e.g. pawpaw.
The placenta is in the centre.
Ovary is divided into a number of loculi. e.g. orange.
The placenta is formed at the base of the ovary e.g. sunflower.
Free Central placentation.
Placenta is in the centre of the ovary.
There are no loculi e.g. in primrose.
Methods of fruit and seed dispersal.
Fleshy fruits are eaten by animals.
Animals are attracted to the fruits by the bright colour, scent or the fact that it is edible.
The seeds pass through the digestive tract undamaged and are passed out with faeces. E.g. tomatoes and guavas.
Such seeds have hard, resistant seed coats.
Others have fruits with hooks or spines that stick on animal fur or on clothes.
Later the seeds are brushed of or fall off on their own e.g. Bidens pilosa (Black jack).
Fruits and seeds are small and light in order to be carried by air currents.
A fruit that is a capsule e.g. tobacco split or has pores at the top e.g. Mexican poppy.
The capsule is attached to along stalk when swayed by wind the seeds are released and scattered.
Some seeds have hairy or feather-like structures which increase their surface area so that they can be blown off by the wind e.g. Sonchus.
Others have wing-like structures e.g. Jacaranda and Nandi Flame.
These extensions increase the surface area of fruits and seeds such that they are carried by the wind.
Fruits like coconut have fibrous mescocarp which is spongy to trap air, the trapped air make the fruit light and buoyant to float on water.
Plants like water lily produce seeds whose seed coats trap air bubbles.
The air bubbles make the seeds float on water and are carried away.
The pericarp and seed coat are waterproof.
Self-dispersal (explosive) Mechanism
This is seen in pods like bean and pea.
Pressure inside the pod forces it to open along lines of weakness throwing seeds away from parent plant.
Abiotic factors (environmental factors)
According to biology dictionary, abiotic factors are non-living factors in the ecosystem. These factors do affect the living things in it, but they are not living themselves. In this context, we will focus mainly on light, temperature, atmospheric pressure, salinity, humidity, pH and wind.
This is the hotness or coldness of an area or habitat. It directly affects the distribution and productivity (yield) of populations and communities.
Most organisms are found in areas where temperature is moderate. However, certain plants and animals have adaptations that enable them to live in areas where temperatures are in the extremes such as the hot deserts and the cold Polar Regions. Temperatures not only influence distribution of organisms but also determine the activities of animals. High temperatures usually accelerates the rates of photosynthesis, transpiration, evaporation and the decomposition and recycling of organic matter in the ecosystem.
Light is required by green plants for photosynthesis. Light intensity, duration and quality affect organisms in one way or another.
This is the force per unit area of atmospheric air that is exerted on organisms at different altitudes. Growth of plants and activity of animals is affected by atmospheric pressure e.g., rate of transpiration in plants and breathing in animals.
This is the salt content of soil or water. Animals and plants living in saline conditions have special adaptations.
Humidity describes the amount of moisture (water vapour) in the air. It affects the rate of transpiration in plants and evaporation in animals.
pH Is the measure of acidity or alkalinity of soil solution or water, it is very important to organisms living in water and soil. Most organisms prefer a neutral pH.
Wind is moving air currents and it influences the dispersion of certain plants by effecting the dispersal of spores, seeds and fruits.
Air currents also modify the temperature and humidity of the surroundings.
These are surface features of a place. The topographical factors considered include altitudes, gradient (slope), depressions and hills, all these characteristics affect the distribution of organisms in an area e.g. the leeward and windward sides of a hill.
These are living components of an ecosystem. These factors affect the ecosystem through enhancing
Inter-relationships between Organisms
The relationships between organisms in a given ecosystem is primarily a feeding one. Organisms in a particular habitat have different feeding levels referred to as trophic levels. There are two main trophic levels:
These organisms that occupy the first trophic level, they manufacture their own food hence are autotrophic.
These are the organisms that feed on organic substances manufactured by green plants, they occupy different trophic levels as follows:
These are herbivores and feed on green plants.
These are carnivores and feed on flesh. First order carnivores feed on herbivores while second order carnivores feed on other carnivores, i.e., tertiary consumers.
These are animals that feed on both plant and animal material. They can be primary, secondary or tertiary consumers.
Competition between themselves for survival
this describes the situation where two or more organisms in the same habitat require or depend on the same resources. Organisms in an ecosystem compete for resources like food, space, light, water and mineral nutrients. Competition takes place when the environmental resource is not adequate for all.
Predation is a relationship whereby one animal (the predator) feeds on another (the prey).
Questions on Topic
1. The flow chart below shows a food web in a terrestrial ecosystem.
2. The food web represents a feeding relationship in an ecosystem.
3. State four abiotic factors in an ecosystem.
Concept of reproduction
The process by which mature individuals produce offspring is called reproduction. Reproduction is a characteristic of all living organisms and prevents extinction of a species.
There are two types of reproduction:
Importance of reproduction
The main importance to reproduction is to give rise to young ones of same ensuring continuity of the group.
Chromosomes, mitosis and meiosis (mention gamete formation)
Cell division starts with division of nucleus. In the nucleus are a number of thread-like structures called chromosomes, which occur in pairs known as homologous chromosomes.
Each chromosome contains-genes that determine the characteristics of an organism. The cells in each organism contains a specific number of chromosomes.
There are two types of cell division:
This takes place in all body cells of an organism to bring about increase in number of cells, resulting in growth and repair. The number of chromosomes in daughter cells remain the same as that in the mother cell.
Mitosis is divided into five main stages:
This type of cell division takes place in reproductive organs (gonads) to produce gametes. The number of chromosomes in the gamete is half that in the mother cell.
Meiosis involves two divisions of the parental cell resulting into four daughter cells. The mother cell has the diploid number of chromosomes. The four cells (gametes) have half the number of chromosomes (haploid) that the mother cell had, in the first meiotic division there is a reduction in the chromosome number because homologous chromosomes and not chromatids separate.
Homologue pairs separate during a first round of cell division, called meiosis I. Sister chromatids separate during a second round, called meiosis II. Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase. [additional information by the Khan Academy]
Meiosis I (First Meiotic division)
Before entering meiosis I, a cell must first go through interphase. As in mitosis the cell prepares for division, this involves replication of chromosomes, organelles and buildup of energy to be used during the meiotic division.
Usually the two daughter cells go into a short resting stage (interphase) but sometimes the chromosomes remain condensed and the daughter cells go straight into metaphase of second meiotic division. The second meiotic division takes place just like mitosis.
Asexual reproduction is the formation of offspring from a single parent, the offspring are identical to the parent.
Types of asexual reproduction.
Binary fission in amoeba
This involves the division of the parent organism into two daughter cells, the nucleus first divides into two and then the cytoplasm separates into two portions. Binary fission also occurs in bacteria, Paramecium, Trypanosoma and Euglena.
Spore formation/reproduction in mucor / Rhizopus
Rhizopus is a saprophytic fungus which grows on various substrate such as bread, rotting fruits or other decaying organic matter. The vegetative body is called mycelium which has many branched threads called hyphae. Horizontal hyphae are called stolons, vertical hyphae are called sporangiophore.
The tips of sporangiophore become swollen to form sporangia, the spore bearing structure, each sporangium contains many spores, as it matures and ripens, it turns black in colour.
When fully mature the sporangium wall burst and release spores which are dispersed by wind or insects. When spores land on moist substratum, they germinate and grow into a new Rhizopus and start another generation.
Spore formation in ferns
The fern plant is called a sporophyte, on the lower side of the mature leaves are sari (Singular: sorus) which bear spores.
Budding in yeast
Budding involves the formation of a protrusion called a bud from the body of the organism, the bud separates from the parent cell, in yeast budding goes on so fast and the first bud starts to form another bud before the separation. A short chain or mass of cells is formed.
WHAT IS ECOLOGY?
Ecology, also called ‘bioecology’, ‘bionomics’, or ‘environmental biology’ is the scientific study of interactions among organisms and between organisms and their environment.
"The word ecology was coined by the German zoologist Ernst Haeckel, who applied the term oekologie to the “relation of the animal both to its organic as well as its inorganic environment.” The word comes from the Greek oikos, meaning “household,” “home,” or “place to live.”" Thus, ecology deals with the organism and its environment. [Source: britannica.com]
Organisms are affected by their environment, and they in turn affect the environment. Green plants manufacture food by photosynthesis which other organisms obtain directly or indirectly.
Growth of plants is mainly affected by environmental factors such as soil and climatic factors, on the other hand, organisms modify the environment through various activities.
This interrelationship comprises the study of ecology, which is important in several fields of study such as agriculture and environmental studies.
Concepts of Ecology
The community and the abiotic or non-living environment together make up an ecosystem or ecological system.
In this system energy flow is clearly defined from producers to consumers and nutrient cycling takes place in paths that links all the organisms and the non-living environment.
This is the place or "home" that an organism lives or is found, e.g., forest or grassland.
A niche is the functional unit in the habitat which includes not only the specific place in which an organism lives but also how the organism functions. To avoid or reduce competition, organisms are separated or segregated by their niches, for example, different species of birds make their nest on one tree, some at tips of terminal branches, and others feed on leaves, some on flowers and yet others on fruits of the same tree, i.e., food niche.
Yet others feed on same food, e.g., worms in the same place but at different times - time niche.
The term population refers to the total number of individuals of a species living in a given area at a particular time.
Density is used in relation to population to refer to the number of individuals of a population found in a unit area.
This is the term used to describe all the organisms living together in an area. During the development of an ecosystem, the species composition of a community changes progressively through stages.
Finally a steady state is reached and this is described as the climax community. This development of an ecosystem is termed succession. Each stage in development of an ecosystem is a sere.
(A seral community (or sere) is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community. In many cases more than one seral stage evolves until climax conditions are attained.)[Source: wikipedia.org].
Succession is primary when it starts with bare ground, and secondary when it starts in a previously inhabited area e.g. after clearing a forest.
This is the mass of all the organisms in a given area, ideally, it is the dry mass that should be compared.
Dictionary.com defines biomass as; ‘the amount of living matter in a given habitat, expressed either as the weight of organisms per unit area or as the volume of organisms per unit volume of habitat.’
This is the maximum sustainable density in a given area e.g. the number of herbivores a given area can support without overgrazing.
This is the distribution of individuals in the available space.
Dispersion may be uniform as in maize plants in a plantation; random as in cactus plants in the savannah ecosystem or clumped together as in human population in cities.
Ecology Practical Activities
Adaptions to Habitat
Comparison of Root nodules from fertile and poor soils
Estimation of Population using Sampling Methods
ENERGY FLOW IN AN ECOSYSTEM, POPULATION ESTIMATION METHODS, ADAPTATIONS AND EFFECTS OF POLLUTION - K.C.S.E BIOLOGY NOTES
Energy Flow in an Ecosystem
Most of the energy used in an ecosystem is derived from the sun. Solar energy is trapped by photosynthetic plants.
It flows through different trophic levels and at each level energy is lost as heat to space and also through respiration.
Besides animals lose energy through excretion and defecation, the amount of energy passed on as food from one trophic level to another decreases progressively.
The energy in the organisms is recycled back to plants through the various nutrient or material cycles.
A food chain is a linear relationship between producers and consumers. It represents the transfer of food energy from green plants through repeated stages of eating and being eaten.
Types of Food Chain
Detritivores feed on organic wastes and dead matter derived from the grazing food chain. Many different types of organisms feed on detritus, they include fungi, protozoa, insects, mites annelids and nematodes.
In a natural community, several food chains are interlinked to form a food web.
Several herbivores may feed on one plant, similarly, a given herbivore may feed on different plants and may in turn be eaten by different carnivores.
These are mainly bacteria and fungi. These organisms feed on dead organic matter thereby causing decomposition and decay and releasing nutrients for plants. They form a link between the biotic and the abiotic components.
Pyramid of Numbers
Refers to the number of organisms in each trophic level presented in a graphic form and a pyramid shape is obtained.
The length of each bar is drawn proportional to the number of organisms represented at that level.
This is because an herbivore feeds on many green plants. One carnivore also feeds on many herbivores.
In a forest the shape of the pyramid is not perfect, this is because very many small animals such as insects, rodents and birds feed on one tree.
Pyramid of Biomass
This is the mass of the producers and consumers at each trophic level drawn graphically.
Population Estimation Methods
It is important to find or estimate the sizes of the different populations in a habitat. Direct counting or head count which involves the counting of every individual, is not always applicable for all organisms. e.g., it is impossible to count directly the numbers of grasshoppers in an area.
Different sampling methods are thus used; a sample acts as a representative of the whole population. .
A Quadrat is a square, made of wood’s metal/hard plastic. It can also be established on the ground using pegs, rope/permanent coloured ink, using metre rule or measuring tape. The size is usually one square metre (1M2), in grassland.
In wooded or forest habitat it is usually larger, and can reach up to 20 m2 depending on particular species under investigation. The number of each species found within the quadrat is counted and recorded. Total number of organisms is then calculated by, finding the average quadrats and multiplying it with the total area of the whole habitat.
The number of quadrats and their positions is determined by the type of vegetation studied.
In a grassland, the quadrat frame can be thrown at random. In other habitats of forest, random numbers that determine the locus at which to establish a quadrat are used.
A line transect is a string or rope that is stretched along across the area in which all the plants that are touched are counted.
It is tied on to a pole or tent peg.
It is particularly useful where there is change of populations traversing through grassland, to woodland to forest land.
This method can also be used in studying the changes in growth patterns in plants over a period of time.
Two line transects are set parallel to each other to enclose a strip through the habitat to be studied. The width is determined by the type of habitat, i.e., grass or forest and by the nature of investigation.
In grassland it can be 0.5 m or 1 m. Sometimes it can be 20 metres or more especially when counting large herbivores. The number of organisms within the belt is counted and recorded.
This is used for animals such as fish, rodents, arthropods and birds.
The animals are caught, marked, counted and released. For example, grasshoppers can be caught with a net and marked using permanent ink. After sometime, the same area is sampled again, i.e., the grasshoppers are caught again. The total number caught during the second catch is recorded.
The number of marked ones is also recorded:
The following assumptions are made:
Density is calculated by dividing the number of organisms by the size of the area studied.
Frequency is the number of times that a species occurs in the area being studied.
This is the proportion of the area covered by a particular species. For example, a given plant species may cover the whole of a given area. In this case the plant is said to have 100% cover.
This is the term used to describe a species that exerts the most effect on others. The dominance may be in terms of high frequency or high density.
Adaptations of Plants to Various Habitats
Organisms have developed structural features that enable them to live successfully in their particular habitats. Plants found beneath the canopies of trees are adapted to low light intensities by having broad leaves.
These are plants that grow in dry habitats, i.e., in deserts and semi-deserts.
They have adaptations to reduce the rate of transpiration in order to save on water consumption. Others have water storage structures.
These are the ordinary land plants which grow in well-watered habitats and have no special adaptations.
Stomata are found on both upper and lower leaf surfaces for efficient gaseous exchange and transpiration.
However, those found in constantly wet places e.g. tropical rain forests, have features that increase transpiration.
These plants are called hygrophytes.
The leaves are broad to increase surface areas for transpiration and thin to ensure short distance for carbon (IV) oxide to reach photosynthetic cells and for light penetration. The stomata are raised above the epidermis to increase the rate of transpiration. They have grandular hairs or byhathodes that expel water into the saturated atmosphere. This phenomenon is called guttation.
Hydrophytes (Water plants)
Water plants are either submerged, emergent or floating.
The leaves have an epidermis with very thin walls and a delicate cuticle.
They have no stomata.
Water is excreted from special glands and pores at the tips.
Other adaptations include the following:
Their structure is similar to that of mesophytes.
The leaves are broad to increase the surface area for water loss.
They have more stomata on the upper surface than on the lower surface to increase rate of water loss. Examples are Pistia sp. (water lettuce), Salvinia and Nymphea.
Halophytes (Salt plants)
These are plants that grow in salt marshes and on coastlines, have root cells that concentrate salts and enable them to take in water by osmosis; they also have salt glands which excrete salts.
Fruits have large aerenchymatous tissues for air storage that makes them float, Some have shiny leaves to reduce water loss. The mangrove plants have roots that spread horizontally, and send some branches into the air.
These aerial roots are known as breathing roots or pneumatophores. They also have lenticel-Iike openings called pneumatothodes through which gaseous exchange takes place.
Effect of Pollution on Human Beings and other Organisms
This is the introduction of foreign material, poisonous compounds and excess nutrients or energy to the environment in harmful proportions. Any such substance is called a pollutant.
Effects and Control of causes of Pollutants in Air, Water and Soil
Industrialisation and urbanisation are the main causes of pollution.
As human beings exploit natural resources the delicate balance in the biosphere gets disturbed.
The disturbance leads to the creation of conditions that are un-favourable to humans and other organisms.
Sources of Pollutants
In most cases, chex, pical wastes from industries are discharged into water. Toxic chemicals such as mercury compounds may be ingested by organisms. Insecticides like DDT, and weedkillers eventually get into the water and contaminate it.
Oil and detergents also pollute water. Excess nitrates and phosphates from sewage and fertilisers cause overgrowth of algae and bacteria in water. This is called eutrophication.
As a result there is insufficient oxygen which causes the deaths of animals in the water.
Smoke from industries and motor vehicles contains poisonous chemicals like carbon (II) oxide, carbon (IV) oxide, sulphur (IV) oxide and oxides of nitrogen.
When sulphur (IV) oxide and oxides of nitrogen dissolve in rain, they fall as acid rain.
Accumulation of carbon (IV) oxide in the atmosphere causes the infrared light to be confined within the atmosphere, the earth's temperature rises. This is called the greenhouse effect.
Carbon particles in smoke coat the leaves of plants and hinder gaseous exchange and photosynthesis. The particles also form smog in the air. Lead compounds are from vehicle exhaust pipes. All these have negative effects on man and the environment.
Plastics and other man-made materials are biologically non-degradable i.e they are not acted upon by micro-organisms. Scrap metal and slag from mines also pollute land.
Failure to rehabilitate mines and quarries also pollute land.
Effects of Pollutants to Humans and other organisms
The term disease denotes any condition or disorder that disrupts the steady state of wellbeing of the body.
Health is a state of physical, mental and emotional wellbeing in the internal environment of the body.
Some of the causes of diseases are due to entry of pathogens and parasites. Pathogens include bacteria, viruses, protozoa and fungi.
Parasites are organisms which live on or in the body of another organisms.
Vectors are animals that carry the pathogen from one person to another. Most are ectoparasites that transmit the disease as they feed.
Bacterial diseases - Cholera and Typhoid
Causative agent is a bacterium Vibrio cholerae.
It is spread through water and food contaminated by human faeces containing the bacteria. The bacteria produce a powerful toxin, enterotoxin that causes inflammation of the wall of the intestine leading to:
Carriers should be identified, isolated and treated during outbreaks.
The term disease causative agent usually refers to the biological pathogen that causes a disease, such as a virus, parasite, fungus, or bacterium. Technically, the term can also refer to a toxin or toxic chemical that causes illness. [Source: wikipedia.org]
Protozoa - Malaria and Amoebic dysentry (Amoebiasis)
Use appropriate anti-malarial drugs.
Amoebic dysentry (Amoebiasis)
This disease is caused by Entamoeba histolytica. The parasites live in the intestinal tract but may occasionally spread to the liver. Transmission - They are transmitted through contaminated water and food especially salads.
Treatment of infected people with appropriate drugs.
Ascaris lumbricoides and Schistosoma
Ascaris lumbricoides lives in the intestines of a man or pig, feeding on the digested food of the host.
The body of the worm is tapered at both ends.
The female is longer than the male.
Mode of transmission
Deworm using appropriate drugs - ant-helminthic.
Schistosoma or bilharzia worm is a flat worm, parasitic on human beings and fresh water snails. (Biomphalaria and Bulinus). The snail act as intermediate host.
Mode of Transmission
Schistosomiasis also known as a bilharsiasis is caused by several species of the genus schistosoma. Schistosoma haematobium - infects the urinary system mainly the bladder. S. japonicum and S. mansoni both infect the intestines. Schistosoma haemotobium is common in East Africa where irrigation is practised and where slow moving fresh water streams harbour snails.
It is spread through contamination of water by faeces and urine from infected persons. The embryo (miracidium) that hatch in water penetrates into snails of the species Biompharahia and Bulinus. Inside the snail's body, the miracidium undergoes development and multiple fission to produce rediae. The rediae are released into the water and develop to form cercariae which infect human through:
Effects on the host
By the end of the topic, the learner should be able to: