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Plant Growth and Development

Short Answer Type

101. Would a defoliated plant respond to photoperiodic cycle ? Why ?

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102. What would be expected to happen if :

(a) GA₃ is applied to rice seedlings.

(b) Dividing cells stop differentiating.

(d) You forget to add cytokinin to the culture medium

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Long Answer Type

103. What do you understand by photoperiodism and vernalisation ? Describe their significance.

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104. Describe briefly : (a) Arithmetic growth (b) Geometric growth (c) Sigmoid growth curve (d) Absolute and relative growth rates.

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105. Both growth and differentiation in higher plants are open. Comment.

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Multiple Choice Questions

106.

The Avena curvature is used for bioassay of

GA₃
IAA
Ethylene
Ethylene

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107.

During seed germination its stored food is mobilised by

ethylene
cytokinin
ABA
ABA

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108.
Match the following and select the correct answer.

Column I

Column II

A.

Centriole

1.

Infolding in mitochondria

B.

Chlorophyll

2.

Thylakoids

C.

Cristae

3.

Nucleic acid

D.

Ribozymes

4.

Basal body cilia of flagella

A

B

C

D

4

3

1

2

A

B

C

D

1

2

4

3

A

B

C

D

1

3

2

4

A

B

C

D

1

3

2

4

A	B	C	D
4	3	1	2

a) Centriole: In an organism with flagella and cilia, the position of these organelles is determined by the mother centriole which becomes the basal body.

b) Chlorophyll: Chlorophyll molecules are specially arranged in and around photosystem that is embedded in the thylakoid membrane of the chloroplast.

c) Cristae: These are folded in the inner membrane of mitochondria, which provides a large amount of surface area for chemical reaction.

d) Ribozymes (Ribonucleic acid enzymes) is an RNA molecule that is capable of catalysing the specific biochemical reaction of nucleic acids.

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109.

A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white - coloured like albinos. Which of the following terms will you use to describe them?