Mastering KCSE Biology with Comprehensive Topical Questions and Answers

Explain structure and functions of the human eye.

4/11/2021

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Explain structure and functions of the human eye. (20mks)

Conjuctiva - Protects eyeball from mechanical injury.
Cornea - Allows light to pass through
Iris - Controls amount of light passing through
Forea - Where image is formed
Sctera - Protect the eye ball; give it shape
Choroid - Absorbs stray lights
Provide nourishment to the eye.
Aqueous/vitreous humour - refract light into the eye towards retina maintain shape of eye ball.
Ciliary body - Controls curvature of the lens.
Rods - Perceive light of low intensity
Cones - Perceives light of high intensity.

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A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected?

1/11/2021

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(a) A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected? (1mk)

Cerebrum;

(b) (i)State two functions of cerebrospinal fluid. (2mks)

Nourishes the brain cells/supplies nutrients/removes metabolic wastes from brain cells.
Acts as a shock absorbs to the CNS

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State how the following parts of the mammalian ear are adapted to their functions.

1/11/2021

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State how the following parts of the mammalian ear are adapted to their functions. (3mks)

(i) Pinna

Funnel shaped to collect and concentrate sound waves into the external auditory meatus;
In some animals its large and when flapped creates air currents lining about cooling effect to the animals;

(ii) Eardrum

Its thin and flexible to enable transformation of sound waves into vibrations

(ii) Cochlea

It’s coiled to offer a large surface area for the attachment of the sensory cells.
Has numerous sensory cells to perceive sound vibrations.
Has thin membrane that vibrates more increasing the intensity of sound vibrations;
It’s filled with a fluid to enhance transmission of sound waves in it.

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KCSE Biology Topical Questions and Answers | Atika School

Explain structure and functions of the human eye.

Explain structure and functions of the human eye. (20mks)

A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected?

(a) A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected? (1mk)

(b) (i)State two functions of cerebrospinal fluid. (2mks)

State how the following parts of the mammalian ear are adapted to their functions.

State how the following parts of the mammalian ear are adapted to their functions. (3mks)

(i) Pinna

(ii) Eardrum

(ii) Cochlea

TOPICS

Form 2

Form 3

Form 4

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KCSE Biology Topical Questions and Answers | Atika School

Explain structure and functions of the human eye.

​Explain structure and functions of the human eye. (20mks)

A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected?

​(a) A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected? (1mk)

(b) (i)State two functions of cerebrospinal fluid. (2mks)

State how the following parts of the mammalian ear are adapted to their functions.

​State how the following parts of the mammalian ear are adapted to their functions. (3mks)

​(i) Pinna

(ii) Eardrum

​(ii) Cochlea

TOPICS

Form 2

Form 3

Form 4

Archives

Categories

Explain structure and functions of the human eye. (20mks)

(a) A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected? (1mk)

State how the following parts of the mammalian ear are adapted to their functions. (3mks)

(i) Pinna

(ii) Cochlea