K.C.S.E Biology Q & A - MODEL 2016PP1QN24
How does nutrition as a characteristic of living organisms differ in plants and animals?
answers
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K.C.S.E Biology Q & A - MODEL 2016PP1QN23
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State two functions of saliva.,
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K.C.S.E Biology Q & A - MODEL 2016PP1QN22
State three characteristics of the class Crustacea.
answers
K.C.S.E Biology Q & A - MODEL 2016PP1QN017
State the name given to the study of:
(i) The cell (ii) Micro-organisms
answers
​(i) The cell
Cytology: (ii) Micro-organisms Microbiology
K.C.S.E Biology Q & A - MODEL 2016PP1QN13
State two factors that affect enzymatic activities
(b)Explain how one of the factors stated in (a) above affects enzymatic activities.
answers
K.C.S.E Biology Q & A - MODEL 2016PP1QN08
State three functions of Golgi apparatus.
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K.C.S.E Biology Q & A - MODEL 2016PP1QN03
State the important of tactic response among some members of the kingdom protista.
answer
K.C.S.E Biology Q & A - MODEL 2015PP2QN04
In an experiment to investigate a factor affecting photosynthesis, a potted plant which had been kept in the dark overnight was treated as shown in the diagram below and exposed to light.
​(a) Why was the potted plant kept in the dark overnight’?
(b) Which factor was being investigated in the experiment? (c) (i) Which test did the students perform to confirm photosynthesis in the leaves labelled P and Q? (ii) State the results obtained in the leaves labelled P and Q. P Q (iii) Explain the results obtained in the leaves labelled P and Q. P Q (d) What was the purpose of leaf Q in the experiment?
ANSWERS
(a) To destarch/remove starch from the leaves;
(b) Carbon (IV) Oxide/CO2; (c) (i) Test for starch; (ii) p - Retained the colour of iodine solution/brown/yellow; Q - Turned blue-black/black/dark-blue; (iii) P - Did not photosynthesize /no starch is formed because Sodium Hydroxide pellets absorbed Carbon (IV) Oxide; Q - Photosynthesized /starch was formed because Carbon (IV) Oxide was in the flask; (d) Control (experiment);
K.C.S.E Biology Q & A - MODEL 2015PP1QN17
What happens to the glucose synthesized during photosynthesis?
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN17
How is a human stomach adapted to
(i) protein digestion? (ii) churning?
answers
​ (i) Has gastric glands; that secrete gastric juice;
(ii) Thick muscular wall; that contract and relax;
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 2015PP1QN08
State two control measures for malaria.
answers
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; 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;
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?
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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 2015PP1QN01
State two guidelines that should be followed when typing scientific names.
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN01
What is meant by the term binomial nomenclature?
answer
K.C.S.E Biology Q & A - MODEL 2014PP2QN07
Describe the process of carbohydrate digestion in human beings.
answers
​In the mouth;
K.C.S.E Biology Q & A - MODEL 2014PP2QN07
Explain how each of the following factors affects the rate of photosynthesis:
(i) temperature; (ii) chlorophyll concentration.
answers
(i) Reactions in photosynthesis are catalysed by enzymes; at optimum temperature photosynthesis proceeds faster;
Below optimum temperature the rate of photosynthesis decreases because enzymes are inactivated by the low temperatures / above optimum the rate of photosynthesis decreases because enzymes are denatured; (ii) Chlorophyll traps energy from sunlight for photosynthesis; The higher the chlorophyll concentration the higher the rate of photosynthesis and vice versa; K.C.S.E Biology Q & A - MODEL 2014PP1QN26
The table provided shows the concentration of sodium and iodine in sea water and cell sap of a plant.
​(a) (i) Name the process through which the plant cells take up sodium ions.
(ii) Give a reason for your answer in (a) (i) above. (b) If the plant was sprayed with a chemical that inhibits respiration: (i) which of the two ions uptake will be affected’? (ii) give a reason for your answer in (b) (i) above.
ANSWERS
​(a) (i) Diffusion;
(ii) Sea water contains a higher concentration of sodium ions than the cell sap; (b) (i) Iodide ions; (ii) Sea water has a lower concentration of iodide ions than the cell. The plant requires energy to take up the iodide ions (by active transport); K.C.S.E Biology Q & A - MODEL 2014PP1QN20
State one function of each of the following cell organelles:
(a) golgi bodies (b) lysosomes.
ANSWERS
​(a) Packaging of substances/glycoproteins/ transportation of glycoproteins;
Secretion of synthesized proteins and carbohydrates; Formation of lysosomes/modification of carbohydrates to form glycoproteins; (1 mark) (b) Digestion of food/Breakdown large molecules; Destroy worn out organdies or cells/tissue; K.C.S.E Biology Q & A - MODEL 2014PP1QN10
What is meant by each of the following terms?
(i) Crenated cell. (ii) Flaccid cell.
ANSWERS
​(i) Crenated cell is a shrunk animal cell that has lost water by osmosis;
(ii) Flaccid cell is a flabby /shrunk plant cell that has lost waster by osmosis;
K.C.S.E Biology Q & A - MODEL 2014PP1QN10
Explain two roles of diffusion in human beings.
ANSWERS
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