M.C.Q

MCQ 11 Mark

Select from the following a plant hormone which promotes cell division.

A
Abscissic Acid
✓
Cytokinins
C
Auxins
D
Gibberellins

Answer

Correct option: B.

Cytokinins

(B) Cytokinins
Explanation: Cytokinins promote cell division.

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MCQ 21 Mark

Select from the following the correct statement about tropic movement in plants:

A
It is due to stimulus of touch and
B
It does not depend upon the direction of temperature. stimulus received.
C
It is observed only in roots and not in stems
✓
It is a growth related movement.

Answer

Correct option: D.

It is a growth related movement.

(D) It is a growth related movement.
Explanation: It is a growth related movement.

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MCQ 31 Mark

What will happen if the deer are missing in the following food chain?
Grass $\rightarrow$ Deer $\rightarrow$ Tiger

A
The population of tigers will increase
✓
The tigers will die
C
The amount of grass will decrease
D
The tigers will start eating grass

Answer

Correct option: B.

The tigers will die

(B) The tigers will die
Explanation: The tigers will die

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MCQ 41 Mark

Match the following with correct response.

Column A	Column B
(i) Central nervous system	(a) Brain
(ii) Peripheral nervous system	(b) Sympathetic nervous system
(iii) Autonomic nervous system	(c) Cranial and spinal nerves
(iv) Reflex action	(d) Reflex arc

A
(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)
✓
(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
C
(i) - (b), (ii) - (d), (iii) - (a), (iv) - ©
D
(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)

Answer

Correct option: B.

(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)

(B) (i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
Explanation:
- The central nervous system (CNS) is made up of the brain, the spinal cord, and the optic nerves.
- The nervous system outside the brain and spinal cord.
- The part of the nervous system responsible for the control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.
- Reflex action is an involuntary and nearly instantaneous movement in response to a stimulus. It is made possible by neural pathways called the reflex arc.

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MCQ 51 Mark

Disposable plastic plates should not be used because:

A
They are made of materials with light weight.
B
They are made of biodegradable materials.
C
They are made of toxic materials.
✓
They are made of non-biodegradable material.

Answer

Correct option: D.

They are made of non-biodegradable material.

(D) They are made of non-biodegradable material.
Explanation: Disposable plastic plates should not be used because they are made of non-biodegradable material. Non-biodegradable substances may be inert, are not broken down and persist in the environment for a long time. They may thus cause harm to the various members of the ecosystem.

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MCQ 61 Mark

In an experiment to study independent inheritance of two separate traits : shape and colour of seeds, the ratio of the different combinations in $\mathrm{F}_{2}$ progeny would be

A
$1: 3$
B
$1: 2: 1$
C
$1: 2: 1$
✓
$9: 3: 3: 1$

Answer

Correct option: D.

$9: 3: 3: 1$

(d) $9: 3: 3: 1$
Explanation:
$9: 3: 3: 1$

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MCQ 71 Mark

As compared to terrestrial organisms, the rate of breathing in aquatic organisms is:

A
slower because the capacity of water of dissolving atmospheric air is limited.
B
slower because the amount of dissolved oxygen in water is fairly low.
✓
faster because they need more oxygen for their survival.
D
faster because the amount of dissolved oxygen in water is fairly low.

Answer

Correct option: C.

faster because they need more oxygen for their survival.

(C) faster because they need more oxygen for their survival.
Explanation: Since the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster than in terrestrial organisms.

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