M.C.Q

MCQ 11 Mark

Consider the following three flowers namely $\mathrm{X}, \mathrm{Y}$ and Z . Which flower(s) would develop into a fruit?

✓
X and Y only
B
X only
C
$Y$ and $Z$
D
Z only

Answer

Correct option: A.

X and Y only

(A) $X$ and $Y$ only
Explanation:A flower's ovary develops into the flower's fruit. Because Flowers X and Y both contain ovaries, they can both develop into

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MCQ 21 Mark

In an ecosystem, the $10 \%$ of energy available for transfer from one trophic level to the next trophic level is in the form of:

✓
Chemical energy
B
Heat energy
C
Mechanical energy
D
Light energy

Answer

Correct option: A.

Chemical energy

(A) Chemical energy
Explanation:The autotrophs capture the energy present in sunlight and convert it into chemical energy. Therefore, the energy available for transfer from one trophic level to the next trophic level in an ecosystem is in the form of chemical energy. When one form of energy is changed to another, some energy is lost.

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MCQ 31 Mark

In the excretory system of human beings, some substances in the initial filtrate such as glucose, amino acids, salts and water are selectively reabsorbed in

✓
Nephron
B
Ureter
C
Urethra
D
Urinary bladder

Answer

Correct option: A.

Nephron

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MCQ 41 Mark

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

A
$0.1 \%$
B
$100 \%$
✓
$10 \%$
D
$1 \%$

Answer

Correct option: C.

$10 \%$

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MCQ 51 Mark

In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as:

✓
Neuromuscular junction
B
Dendrites
C
Axon
D
Cell body

Answer

Correct option: A.

Neuromuscular junction

(A) Neuromuscular junction
Explanation:In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as Neuromuscular junction.

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MCQ 61 Mark

Match the following with correct response.

Column A	Column B
(i) The largest part of the brain	(a) Cranial meninges
(ii) The protective covering of the brain	(b) Spinal cord
(iii) Forebrain	(c) Olfactory lobe
(iv) Cerebellum	(d) Cerebrum

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

Answer

Correct option: D.

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

(D) (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
Explanation:
- The cerebrum is the largest part of the brain, located superiorly and anteriorly in relation to the brainstem.
- The primary function of Cranial meninges is to protect the nervous system. It is a three-layer protective tissue that surrounds the neuraxis.
- Olfactory lobe Either member of a pair of lobes in the forebrain.
- At the anterior end of the cerebrum; the part of the brain at the back of the skull in vertebrates, which coordinates and regulates muscular activity.

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MCQ 71 Mark

A cross between two tall pea plants resulted in offsprings having a few dwarf plants. The gene-combination of the parental plants must be

✓
Tt and Tt
B
Tt and tt
C
TT and tt
D
TT and Tt

Answer

Correct option: A.

Tt and Tt

(A) Tt and Tt

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MCQ 81 Mark

Anaerobic process

✓
takes place in yeast during fermentation
B
produces only energy in the muscles of human beings
C
takes place in the presence of oxygen
D
produces ethanol, oxygen, and energy

Answer

Correct option: A.

takes place in yeast during fermentation

(A) takes place in yeast during fermentation

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