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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

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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?

Mutated
Embolised
Etiolated
Etiolated

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110.
Which one of the following growth regulators is known as stress hormone?

abscsic acid

Ethylene

GA₃

GA₃

abscsic acid

Abscisic Acid (ABA) is also known as stress hormone or dormin because it is produced in much higher amounts, when plants are subjected to various kinds of stresses. It often gives plants organs a signal that they are undergoing physiological stresses such as lack of water, saline soil, cold temperature and frost. ABA often cause responses that help plants and protect against these stresses.

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