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Question (31)

QN0036102

31 A plant root grows towards a region containing more water. This movement would be called

(A) Hydrotropism
(B) Phototropism
(C) Geotropism
(D) Chemotropism

Correct Answer: A

Explanation:

Hydrotropism is directional growth in response to water.

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Question (32)

QN0036103

32 Why are growth-related movements in plants generally slower than the movement of a sensitive plant's leaves?

(A) Growth requires changes over time
(B) Plants have no cells
(C) Sensitive plants have muscles
(D) Growth movements do not involve cells

Correct Answer: A

Explanation:

Growth-related movements depend on changes in growth and therefore occur more slowly.

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Question (33)

QN0036104

33 A tendril comes in contact with a support. The side away from the support grows faster. What is the result?

(A) The tendril becomes straight
(B) The tendril circles around the support
(C) The tendril stops growing completely
(D) The tendril falls down

Correct Answer: B

Explanation:

Unequal growth causes the tendril to circle around the support.

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Question (34)

QN0036105

34 Which plant hormone is synthesised at the shoot tip and helps cells grow longer during phototropism?

(A) Insulin
(B) Auxin
(C) Adrenaline
(D) Thyroxin

Correct Answer: B

Explanation:

Auxin is produced at the shoot tip and promotes cell elongation.

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Question (35)

QN0036106

35 When light falls from one side of a shoot, auxin tends to accumulate more on the

(A) Illuminated side
(B) Shaded side
(C) Root tip only
(D) Leaf surface only

Correct Answer: B

Explanation:

Auxin diffuses towards the shaded side and promotes elongation there.

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Question (36)

QN0036107

36 Which hormone promotes cell division in plants?

(A) Cytokinin
(B) Abscisic acid
(C) Insulin
(D) Adrenaline

Correct Answer: A

Explanation:

Cytokinins promote cell division.

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Question (37)

QN0036108

37 Which plant hormone inhibits growth and can cause wilting of leaves?

(A) Auxin
(B) Gibberellin
(C) Abscisic acid
(D) Cytokinin

Correct Answer: C

Explanation:

Abscisic acid is a growth-inhibiting hormone and its effects include wilting.

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Question (38)

QN0036109

38 Which pair of plant hormones is associated with promoting plant growth?

(A) Auxins and gibberellins
(B) Insulin and adrenaline
(C) Thyroxin and insulin
(D) Abscisic acid and insulin

Correct Answer: A

Explanation:

Auxins and gibberellins promote plant growth.

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Question (39)

QN0036110

39 Why do multicellular organisms use chemical communication in addition to electrical impulses?

(A) Chemical signals can reach cells without direct nervous connections
(B) Electrical impulses cannot move
(C) Hormones always act faster than nerve impulses
(D) Chemical signals work only in plants

Correct Answer: A

Explanation:

Chemical signals can reach cells throughout the body and their effects may persist longer.

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Question (40)

QN0036111

40 A chemical signal released by a cell spreads to other cells and is detected by them. This illustrates

(A) Chemical communication
(B) Digestion
(C) Respiration
(D) Circulation

Correct Answer: A

Explanation:

Chemical compounds can act as signals between cells.

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Question (31)

31 A plant root grows towards a region containing more water. This movement would be called

Explanation:

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Question (32)

32 Why are growth-related movements in plants generally slower than the movement of a sensitive plant's leaves?

Explanation:

Link:

Question (33)

33 A tendril comes in contact with a support. The side away from the support grows faster. What is the result?

Explanation:

Link:

Question (34)

34 Which plant hormone is synthesised at the shoot tip and helps cells grow longer during phototropism?

Explanation:

Link:

Question (35)

35 When light falls from one side of a shoot, auxin tends to accumulate more on the

Explanation:

Link:

Question (36)

36 Which hormone promotes cell division in plants?

Explanation:

Link:

Question (37)

37 Which plant hormone inhibits growth and can cause wilting of leaves?

Explanation:

Link:

Question (38)

38 Which pair of plant hormones is associated with promoting plant growth?

Explanation:

Link:

Question (39)

39 Why do multicellular organisms use chemical communication in addition to electrical impulses?

Explanation:

Link:

Question (40)

40 A chemical signal released by a cell spreads to other cells and is detected by them. This illustrates

Explanation:

Link:

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