KNEC KCSE BIOLOGY TOPICAL QUESTIONS AND ANSWERS

(a) Name the organs labelled L and M.
L
M .
(b) (i) Name the substance produced by the organ labelled K.
(ii) State the function of the substance named in b(i) above.

answers

.(a) L - Duodenum;
M - Pancreas;
(b) (i) Bile;
(ii) Emulsification/emulsifies fats;
(iii) Provides alkalinic medium for enzyme action.
(iv) Neutralizes acidic chyme.

Comments

What is the role of blood platelets in the blood clotting process?

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN16

What is the role of blood platelets in the blood clotting process?

answers

When exposed to air they disintegrate/rupture/burst; releasing thromboplastin; thrombokinase

Comments

Describe the condition known as varicose veins.

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN16

Describe the condition known as varicose veins.

answers

Weakened/defective valves in veins; causing blood/body fluid to accumulate; leading to swelling.

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN15

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN15

Give reasons for carrying out the following procedures when preparing temporary wet mounts of plant tissues.
(a) Making thin plant sections.
(b) Adding water on the plant section.
(c) Placing a cover slip over the plant section.

answers

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN14

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN14

The diagram below represents a certain plant.

(a) What is the likely habitat for the plant?
(b) Give two reasons for your answer in (a) above.

answers

(a) Dry/Arid/Semi-arid/Desert;
(b) Succulent/ fleshy stem; reduced leaves/leaves reduced into thorns/leaves modified into spines/spikes;

Comments

State two functions of carbohydrates in the human body.

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN13

State two functions of carbohydrates in the human body.

answers

Source of energy;
Storage materials;

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN12

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN12

The diagram below represents a certain organism.

State the phylum and class to which it belongs.
Phylum
Class

answers

Chordata; . Aves; .

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN11

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN11

State the functions of the following parts of a light microscope.
(a)Fine adjustment knob.
Stage.

answers

(a)Moves the body tube through smaller distances to bring the image/specimen/object into sharper focus;
(b)Platform where specimen (on slide) is placed;

Comments

Name the site of anaerobic respiration in a cell.

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN10

Name the site of anaerobic respiration in a cell.

answer

Cytoplasm;

Comments

Give two differences in the products of anaerobic respiration between plants and animals.

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN10

Give two differences in the products of anaerobic respiration between plants and animals.

answers

(i) Lactic acid in animals while in plants it is ethanol/alcohol;
(ii) No carbon IV oxide produced in anaerobic respiration in animals while anaerobic respiration in plants produces carbon IV oxide;

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN09

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN09

The diagrams below illustrate the organs of some flowering plants.

State the classes of plants to which each belong.
A
B

answers

(a) Dicotyledonae;
(b) Monocotyledonae;

Comments

State three characteristics of the class crustacea.

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN08

State three characteristics of the class crustacea.

answers

Fused head and thorax/cephalothorax often protected by a carapace;
Gaseous exchange through gills;
Two pairs of antennae;
Five to twenty pairs of limbs;
A pair of compound eyes;
Three pairs of mouth parts (consisting of mandibles, maxillary, palp and labium) a pair of
mandibles and 2 pairs of maxillae.

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN07

25/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2011PP1QN07

The diagrams below show an experimental set-up to investigate a certain process in a plant tissue.

Explain the results obtained after 30 minutes.

answers

Water was hypotonic to cell sap of adjacent cells; and these cells absorbed water through osmosis; and their cell sap became less concentrated than those of the next cells;
The process was repeated until water reached the sugar solution:

Comments

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Forward>>

State two functions of saliva.

State two functions of saliva.

Name one salivary gland in humans,

Name one salivary gland in humans,

K.C.S.E Biology Q & A - MODEL 2011PP1QN17

K.C.S.E Biology Q & A - MODEL 2011PP1QN17

What is the role of blood platelets in the blood clotting process?

What is the role of blood platelets in the blood clotting process?

Describe the condition known as varicose veins.

Describe the condition known as varicose veins.

K.C.S.E Biology Q & A - MODEL 2011PP1QN15

K.C.S.E Biology Q & A - MODEL 2011PP1QN15

K.C.S.E Biology Q & A - MODEL 2011PP1QN14

K.C.S.E Biology Q & A - MODEL 2011PP1QN14

State two functions of carbohydrates in the human body.

State two functions of carbohydrates in the human body.

K.C.S.E Biology Q & A - MODEL 2011PP1QN12

K.C.S.E Biology Q & A - MODEL 2011PP1QN12

K.C.S.E Biology Q & A - MODEL 2011PP1QN11

K.C.S.E Biology Q & A - MODEL 2011PP1QN11

Name the site of anaerobic respiration in a cell.

Name the site of anaerobic respiration in a cell.

Give two differences in the products of anaerobic respiration between plants and animals.

Give two differences in the products of anaerobic respiration between plants and animals.

K.C.S.E Biology Q & A - MODEL 2011PP1QN09

K.C.S.E Biology Q & A - MODEL 2011PP1QN09

State three characteristics of the class crustacea.

State three characteristics of the class crustacea.

K.C.S.E Biology Q & A - MODEL 2011PP1QN07

K.C.S.E Biology Q & A - MODEL 2011PP1QN07

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