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Describe causes and methods of controlling water pollution

22/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP2QN08

Describe causes and methods of controlling water pollution

Picture
answers
  • It is addition of substance into water that may cause harm to organisms and are disruptive to ecosystem.
  • The causes of water pollution include:
  • Industrial effluents that may be toxic chemicals which may kill the aquatic organisms. It can be controlled by treating the effluents before discharging them.
  • Hot water that reduces concentration of oxygen killing the animals. It is controlled by placing high penalties on factories discharging hot water.
  • Oil spillage from oil tankers that reduces oxygen in water, penetration of light intensity and clog feathers of marine birds. It can be controlled by regular servicing of oil tankers.
  • Domestic effluents that include:
  • Untreated sewerage that causes water borne diseases. It can be controlled by treating sewerage before being discharged.
  • Detergents that cause eutrophication causing reduced oxygen concentration. It is controlled by banning phosphate based detergents.
  • Agricultural effluents that include:
  • Pesticides and herbicides that have heavy metals that they may cumulates along the food chain killing the higher animals. It is controlled by use of biological control of pests. 
  • Inorganic fertilizers that have nitrates and sulphates that cause eutrophication is controlled by use of organic fertilizers.
  • Silting due to soil erosion reduces penetration of light to the plants and clog respiratory surfaces of animals. It is controlled by proper methods of soil erosion and proper farming methods.
Comments

Name the part of a bean that elongates to bring about epigeal germination

21/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP1QN19

Name the part of a bean that elongates to bring about epigeal germination

Picture
ANSWER
  • Hypocotyl
Comments

State two environmental conditions that can cause seed dormancy

21/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP1QN19

State two environmental conditions that can cause seed dormancy

Picture
ANSWERS
  •  absence of water (moisture)
  • Unsuitable temperature
  • Lack of oxygen
  • Lack of light
Comments

State two disadvantages of sexual reproduction in animals

21/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP1QN18

State two disadvantages of sexual reproduction in animals

Picture
ANSWERS
  • Harmful characteristics from the parents may be passed on the offsprings
  • Takes a longer time
  • Few offsprings are produced at a time
Comments

K.C.S.E Biology Q & A - MODEL 2007PP1QN17

21/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2007PP1QN17

The diagram below represents a stage during cell division
Picture
(a) (i) Identify the stage of cell division 
(ii) Give three reasons for your answer in (a) (i) above 
(b) Name the structures labeled M 
ANSWERS
(a) (i) Anaphase 1
(i) Homologous chromosomes separates at the equator
(ii) Chromosomes start migrating to opposite poles
(iii) Sister chromatids attached at the centromere
(b) Spindle fibres
Comments

State two ways in which schritosoma species is adapted to parasitic mode of life

21/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP1QN16

State two ways in which schritosoma species is adapted to parasitic mode of life

Picture
ANSWERS
  •  Produce large number of eggs for increased survival
  • Produce enzymes to digest human skin when penetrating
  • Can withstand low oxygen concentration
  • Have hooks – like structures to attach to the intestinal walls
Comments

K.C.S.E Biology Q & A - MODEL 2007PP1QN15

21/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2007PP1QN15

Name a method that could be used to estimate the population size of the following organisms
(i) Fish in a pond 
(ii) Black jack in a garden 
Picture
ANSWERS
​(i) Capture and recapture  method
(ii) Line transect
Comments

Distinguish between population and community

21/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP1QN15

Distinguish between population and community

Picture
ANSWERS
  • Population – It is all members of a given species in particular habitat at a particular time.
  • Community-all organisms belonging to different species interact in the same habitat.
Comments

K.C.S.E Biology Q & A - MODEL 2007PP1QN14

21/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2007PP1QN14

 What is the meaning of the terms
(i) Homeostatic 
(ii) Osmoregulation? 
Picture
ANSWERS
  • maintenance of a concentration of water and salts ion the body fluid.
  • maintenance by an organism of an internal balance between water and dissolved materials regardless of environmental conditions.
Comments

K.C.S.E Biology Q & A - MODEL 2006PP2QN05

19/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2006PP2QN05

The diagram below represents human foetus in a uterus.
Picture
a) Name the part labeled S. 
b) i) Name the types of blood vessels found in the structure labeled Q. 
ii) State the differences in composition of blood found in the vessels named in (b)(i) above. 
c) Name two features that enable the structure labeled P carry out its function. 
d) State the role of the part labeled R 
answers
(a) Chorion
(b) (i) Arteries; veins
(ii) More food nutrients; more oxygen in veins less food nutrients more  excretory products in arteries
(c) Highly vascular zed; large surface area
 Presence of secretory cells
(d) Cushion/ absorb shock
Comments

Give three reasons for loss of energy from one trophic level to another in the food chain.

19/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2006PP2QN03

Give three reasons for loss of energy from one trophic level to another in the food chain.

Picture
answers
  •  Insufficient utilization of food resource/ wastage
  • Through respiration
  • Though excretion
Comments

Distinguish between pyramid of numbers and pyramid of biomass.

19/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2006PP2QN03

Distinguish between pyramid of numbers and pyramid of biomass.

Picture
answers
  • Pyramid of numbers is a diagrammatic representation of the  number of  organism, at each trophic level in a food chain; While biomass is a diagrammatic representation  of dry weight organism at each trophic level  in a  food  chain.
Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN26

19/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2006PP1QN26

The chart below represents a simplified nitrogen cycle.
Picture
​What is represented by X,Y, and Z?
answers
X- Denitrifying bacteria/ denitrification
Y- Animals/ Herbivores; accept primary consumers
Z- Nitrogen fixing bacteria ( in soil) accept Azotobacter.
Comments

Give three advantages of cross pollination.

19/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2006PP1QN19

Give three advantages of cross pollination.

Picture
answers
  • Increases variety;
  • Hybrid vigour/ heterosis
  • Resistance of disease/ drought/ dry climate/ unfavorable environmental conditions/ Frost; E.g. resistance to virus, fungi, bacterial diseases of pest.
Comments

Why is oxygen necessary in the germination of seeds?

19/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2006PP1QN14

Why is oxygen necessary in the germination of seeds?

Picture
answer
  • Required in aerobic respiration/ oxidation; to release energy from food reserve for germination; 
Comments
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    FORM 1
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