Multiple Choice QuestionsCellular 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
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
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
B.
It is affected by interruption of long dark period by brief exposure of light
Short day plants flower when exposed to day lengths shorter than a certain critical duration. Interruption by dark during long light period does not stimulate flowering. It means they do not flower if dark period is interrupted by a flash of light. They are also called long night plants. Whereas interruption by dark during long light period does not inhibit flowering in long-day plants (short-night plants).
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