221.

Cellular totipotency was first demonstrated by

• F C Steward

• Robert Hooke

• T Schwann

• A v Leeuwenhoek

Choose the minor carp from the following

• Cyprinus carpio

• Anguilla sp

• Labeo bata

• cetanophyrngodon idella

Name of a gaseous plant hormone is

• IAA

• gibberellin

• ethylenes

• abscisic acid

During seed germination its stored food is mobilised by

• ethylene

• cytokinin

• ABA

• gibberellin

Which one of the following is a growth regulator produced by plants?

• Naphthalene acetic acid

• Zeatin

• 2,4-dichlorophenoxy acetic acid

• Benzyl aminopurine

Match the items in column I with those in column II and choose the correct answer

Column I	Column II
A. Control of weeds	1. Gibberellin
B. Induction of germination	2. Cytokinin
C. Ripening of fruit	3. 2, 4- D
D. Delaying of senescence	4. Ethylene

• A- 2; B- 4; C- 3; D- 1

• A- 3; B- 1; C- 4; D- 2

• A- 1; B- 2; C- 4; D- 3

• A- 2; B- 3; C- 1; D- 4

The aleurone synthesises and secretes digestive enzymes that hydrolyse nutrients stored in the endosperm, in the presence of

• auxin

• gibberellin

• cytokinin

• ethylene

Vernalisation promotes flowering by

• low temperature

• high temperature

• prolonged photoperiod

• short photoperiod

Elongation of internode is caused by

• ethylene

• gibberellin

• abscisic acid

• cytokinin

Which one of the following is correct for blooming of 'short day' plants?

• The long dark period is not critical

• It is affected by interruption of long dark period by brief exposure of light

• It is not affected by interruption of long dark period by brief exposure of light

• It is affected if the continuous light period is interrupted