KNEC KCSE BIOLOGY TOPICAL QUESTIONS - ATIKA SCHOOL

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State four structural differences between millipedes and centipedes.

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN16

State four structural differences between millipedes and centipedes.

answers

Millipedes Centipedes
Cylindrical body Dorso - ventrally flattened
Head has two clumps of many simple eyes Head has a pair of simple eyes
Each segment has two pairs of walking Each segment has a pair of waking legs
legs (except the first thoracic segment)
Head has a pair of short antennae; Head has a pair of long antennae.
No poison claws Has poison claws
Three body parts - head short, throrax, Two body parts - head and trunk
and trunk
Has anterior genital aperture Has aposterior genital aperture
Has 9 - 100 segments Has 15 - 21 segments

K.C.S.E Biology Q & A - MODEL 2015PP1QN15

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN15

The photomicrographs below show the various stages of cell division in a certain plant.

(a) (i) Name the type of cell division illustrated.
(ii) Give a reason for your answer in (a) (i) above.
(b) (i) Name the stage of cell division labelled K.
(ii) Give a reason for your answer in (b) (i) above.

answers

(a) (i) Mitosis;
(ii) Formation of two daughter cells.
(b) (i) Metaphase;
(ii) Chromosomes are at the equator

Name two types of involuntary muscles in mammals.

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN14

Name two types of involuntary muscles in mammals.

b)State the location of each of the muscles named in (a) above.

answers

Smooth muscles/visceral muscles;
Cardiac muscles;

b) Smooth muscles - tubular visceral organs;
Cardiac muscles - heart

State three differences between the end products of mitosis and meiosis.

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN13

State three differences between the end products of mitosis and meiosis.

answers

K.C.S.E Biology Q & A - MODEL 2015PP1QN12

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN12

(a) What is meant by each of the following:
(i) pyramid of biomass?
(ii) pyramid of numbers’?
(b) During an ecological visit to the Savanna Grassland, students were able to see lions, antelopes, vultures and pastoralists grazing their cattle. Construct a food chain with four consumer levels to illustrate the energy flow in the ecosystem.

answers

(a) (i) Pyramid of biomas represents total dry mass weight of organisms in each trophic level;
(ii) While pyramid of numbers represents the total number of organisms at each trophic level/feeding levels/nutrition levels;

Name two structures used for gaseous exchange in plants.

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN11

Name two structures used for gaseous exchange in plants.

answers

Stomata (in leaves);
Lenticels (in stems and roots)/pneumatophores;
Epidermis (roots)
Cuticle

K.C.S.E Biology Q & A - MODEL 2015PP1QN10

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN10

The diagram below illustrates the skulls of adult human and chimpanzee.

(a) State one difference between the two skulls in the following structures:

(b) State the significance of the evolution observed on the parietal bone in the chimpanzee and human skulls.

answers

(b) Accommodate large sized brain in humans;

K.C.S.E Biology Q & A - MODEL 2015PP1QN09

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN09

The diagram below shows an experimental set up to investigate a certain physiological process in plants.

(a) State the aim of the experiment.
(b) State the role of the following in the experiment:
(i) potassium hydroxide;
(ii) aluminum foil.
(c) Account for the expected colour change in tube F.

answers

(a) To show that carbon (TV) oxide is produced during respiration in plants;
(b) (i) Absorb carbon (IV) oxide from the (incoming) air;
(ii) Exclude light / to prevent photosynthesis;
(c) No colour change in tube F / no observable colour change.
Carbon (IV) oxide removed/absorbed from air by potassium hydroxide.

State two control measures for malaria.

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN08

State two control measures for malaria.

answers

Controlling mosquitoes/vectors/cleaning breeding sites/draining stagnant water/use of insecticides;
Vaccination/taking prophylactic drugs;
Sleeping under mosquito nets / use of mosquito repellants.

K.C.S.E Biology Q & A - MODEL 2015PP1QN08

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN08

Name the organism that:
(î) causes malaria;
(ii) transmits malaria.

answers

(i) Plasmodium spp/malariae, vivax, Ovale, falseparum;
(ii) Anopheles female mosquito;

How is a guard cell structurally adapted for gaseous exchange?

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN07

How is a guard cell structurally adapted for gaseous exchange?

answers

Thin/elastic outer wall; it bulges outwards;
Thick/less elastic inner wall; it curves to open the stomata/straightens to close the stomata;
Has chloroplasts; for photosynthesis/synthesized sugar (glucose/sucrose/fructose) that is osmotically active.

K.C.S.E Biology Q & A - MODEL 2015PP1QN06

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN06

Students set up an experiment as illustrated below.

(a) Name the physiological process that resulted in the observations made after 30 minutes.
(b) State the importance of the physiological process investigated in plants.
(c) Explain the observations made after 30 minutes.

answers

(a) Osmosis;
(b) Absorption of water from the soil; opening and closing of stoma; feeding in insectivorous plants; support (in seedlings, leaves,herbaceous plants);
Movement of water from cell to cell in plants.
(c) The thistle funnel gained water by osmosis; because the sucrose solution was hypertonic;

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN05

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?

answers

Click the low power objective lens into position. Bring it down to the lowest level using the coarse adjustment knob;
With eyes on the eyepiece lenses and using the coarse adjustment knob gradually raise lower the low power objective lens to bring the specimen into focus;

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN05

State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.

answers

(i) To hold the specimen in place;
(ii) Protects specimen from dehydration/drying up/dust particles;
(iii)Protect objective lens from staining.

K.C.S.E Biology Q & A - MODEL 2015PP1QN04

29/6/2020

K.C.S.E Biology Q & A - MODEL 2015PP1QN04

Colour blindness is a sex linked trait controlled by a recessive gene b. If a mother is a carrier and the father is normal, what is the chance that their son will be colour blind? Show your working.

answers

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