M.C.Q

MCQ 11 Mark

Choose the correct order of the stages of binary fission in Leishmania.

A
I, III, V, II, IV
✓
I, III, II, V, IV
C
I, II, III, V, IV
D
I, II, III, IV, V

Answer

Correct option: B.

I, III, II, V, IV

(B) I, III, II, V, IV
Explanation:
In Leishmania binary fission occurs in a definite orientation:
i. A constriction in the cell membrane first appears after nuclear division.
ii. Inwardly transversely from the centre of the dividing cell, the membrane expands.
iii. The cytoplasm divides into two equal pieces, each with a single nucleus
iv. The daughter cells can split off and create two new creatures.

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MCQ 21 Mark

Identify the food chain in which the organisms of the second trophic level are missing:

✓
Tiger, grass, snake, frog
B
Grasshopper, grass, snake, frog, eagle
C
Grass, goat, lion
D
Zooplankton, Phytoplankton, small fish, large fish

Answer

Correct option: A.

Tiger, grass, snake, frog

(A) Tiger, grass, snake, frog
Explanation:
Tiger, grass, snake, frog

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MCQ 31 Mark

One of the events that does not occur during photosynthesis is:

A
Chlorophyll absorbs solar energy.
✓
Carbon dioxide is released during the process.
C
Carbon dioxide is absorbed during the process.
D
Oxygen is released during the process.

Answer

Correct option: B.

Carbon dioxide is released during the process.

(B) Carbon dioxide is released during the process.
Explanation:
During this process, the following things take place:
i. Chlorophyll's absorption of light energy.
ii. Splitting of water molecules into hydrogen and oxygen and the conversion of light energy into chemical energy.
iii. Carbon dioxide is converted to carbohydrates.
$\underset{\text { carbon dioxide }}{6 \mathrm{CO}_{2}}+\underset{\text { water }}{6 \mathrm{H}_{2} \mathrm{O}} \xrightarrow{\text { photosynthesis }} \underset{\text { glucose }}{\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}}+\underset{\text { oxygen }}{6 \mathrm{O}_{2}}$

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MCQ 41 Mark

A food chain will be more advantageous in terms of energy if it has

A
3 trophic levels
✓
2 trophic levels
C
5 trophic levels
D
4 trophic levels

Answer

Correct option: B.

2 trophic levels

(B) 2 trophic levels
Explanation:
2 trophic levels

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MCQ 51 Mark

In plants the role of cytokinin is:

A
Promote the opening of stomatal pore.
B
Help in the growth of stem.
C
Wilting of leaves.
✓
Promote cell division.

Answer

Correct option: D.

Promote cell division.

(D) Promote cell division.
Explanation:
In plant cells, cytokinins encourage cell division, Plant roots and shoots contain it.

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MCQ 61 Mark

Match the following with correct response.

Column A	Column B
(i) The master gland	(a) Control cell division and cell growth
(ii) Cytokinin	(b) Regulates metabolism
(iii) Insulin	(c) Reduces blood sugar
(iv) Thyroxine	(d) Pituitary gland

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

Answer

Correct option: A.

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

(A) (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
Explanation:
- The pituitary gland is a master gland that produces growth hormones.
- Cytokinins are a group of hormones that promote cell division in plant roots and shoots and the growth of buds.
- The insulin hormone is secreted by the pancreas which maintains blood sugar level in the body.
- Thyroxine a hormone that is made by the thyroid gland and is one of the most important thyroid hormones and it also maintains metabolism in the body.

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MCQ 71 Mark

A zygote is formed by the fusion of a male gamete and a female gamete. The number of chromosomes in the zygote of a human is

A
23
B
92
✓
46
D
44

Answer

Correct option: C.

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MCQ 81 Mark

The process in which loss of water in the form of vapours from the aerial parts of plants takes place is $X$, which helps in Y . Here X and Y respectively are:

A
transpiration and photosynthesis.
B
translocation and absorption of water and minerals from soil by roots.
C
translocation and movement of soluble products of photosynthesis in phloem.
✓
transpiration and temperature regulation.

Answer

Correct option: D.

transpiration and temperature regulation.

(D) transpiration and temperature regulation.
Explanation:
transpiration and temperature regulation.

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