KNEC KCSE BIOLOGY TOPICAL QUESTIONS

Exposes leaves/ shoots for maximum/ a lot of absorption for sunlight for photosynthesis;
Enable roots of plants to seek/search water; rej mineral salts/ ions alone.
Enables plants stems to obtain mechanical support especially those that lack woody stems
Enables roots to grow deep in soil fro anchorage
Enable pollen tube to grow towards embryo sac to facilitate fertilization

Comments

What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN20

What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?

answer

Thigmotropism/ Haptotropism;

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.

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

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

19/6/2020

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

a) Explain how the following prevent self pollination.
(i) Protoadry
(ii) Self – sterility.

answers

(i) Protoandry – Male reproduction organ/ anthers androecia/ stamens mature earlier than female reproduction organ/ carpels/ stigma/ pistil/ gynoecium.
(ii) Self sterility- pollen grains are sterile to stigma of some plants/ flowers

Comments

How does substrate concentration affect the rate of enzyme action?

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN18

How does substrate concentration affect the rate of enzyme action?

answer

Increase in substrate concentration rise enzyme action up to a certain point and further rise of substrate will have no effect.

Comments

State two functions of bile juice in the digestion of food.

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN18

State two functions of bile juice in the digestion of food.

answers

emulsification of fats/ breaking into small droplets; Increase surface area for digestion; Neutralizes acidity of chime/ provides alkaline media for enzyme action.

Comments

A certain animal has no incisors, no canines, 6 premolars and 6 Molars in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 Premolars and six molars.Write its dental formula.

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN17

A certain animal has no incisors, no canines, 6 premolars and 6 Molars in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 Premolars and six molars. Write its dental formula.

answer

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What is the function of carnassials teeth?

19/6/2020

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K.C.S.E Biology Q & A - MODEL 2006PP1QN17

What is the function of carnassials teeth?

answer

Cutting/ chopping/ Shearing/ Slicing/ crusting

Comments

Distinguish between the terms homodont and heterodont.

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN17

Distinguish between the terms homodont and heterodont.

answers

Homodont – having same kind/ type/ similar teeth.while Heterodont – having different type kind of teeth

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN16

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN16

What is the importance of the following in an ecosystem?
a) Decomposers
b) Predation

answers

(a) Decomposer – recycling of nutrients
(b) Predation – regulation of numbers/ population

Comments

Explain continental drift as an evidence of evolution.

19/6/2020

Comments

K.C.S.E Biology Q & A - MODEL 2006PP1QN15

Explain continental drift as an evidence of evolution.

answers

Current continents existed as one large land mass/ Pingea/ Laureshia Guondaland; the present continent drifted leading to isolation of organisms; organism in each continent evolved along different lines hence emergence of new species,

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K.C.S.E Biology Q & A - MODEL 2006PP1QN23

K.C.S.E Biology Q & A - MODEL 2006PP1QN23

State two functional differences between the rods and cones in the human eye.

State two functional differences between the rods and cones in the human eye.

State the function of ciliary muscles in the human eye.

State the function of ciliary muscles in the human eye.

K.C.S.E Biology Q & A - MODEL 2006PP1QN21

K.C.S.E Biology Q & A - MODEL 2006PP1QN21

State three biological importance of tropisms plants.

State three biological importance of tropisms plants.

What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?

What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?

Give three advantages of cross pollination.

Give three advantages of cross pollination.

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

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

How does substrate concentration affect the rate of enzyme action?

How does substrate concentration affect the rate of enzyme action?

State two functions of bile juice in the digestion of food.

State two functions of bile juice in the digestion of food.

A certain animal has no incisors, no canines, 6 premolars and 6 Molars in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 Premolars and six molars.Write its dental formula.

A certain animal has no incisors, no canines, 6 premolars and 6 Molars in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 Premolars and six molars. Write its dental formula.

What is the function of carnassials teeth?

What is the function of carnassials teeth?

Distinguish between the terms homodont and heterodont.

Distinguish between the terms homodont and heterodont.

K.C.S.E Biology Q & A - MODEL 2006PP1QN16

K.C.S.E Biology Q & A - MODEL 2006PP1QN16

Explain continental drift as an evidence of evolution.

Explain continental drift as an evidence of evolution.

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