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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

ABA

Gibberellin induces aleurone cells to secrete an enzyme to break stored food in the seed. Cytokinines promote nutrient mobilisation, which helps in the delay of leaf senescence.
ABA plays an important role in seed development, maturation and dormancy. Ethylene induces fruit ripening, breaks seed dormancy.

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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?