Q. No.Induction of flowering by low temperature in plants is
1. cryobiology
2. vernalization
3. phototropism
4. pruning.
An enzyme that can stimulate germination of barley seeds is:-
1. α-amylase
2. lipase
3. protease
4. invertase
How does pruning help in making the hedge dense:-
1.
It induces the differentiation of new shoots from the rootstock
2.
It frees axillary buds from apical dominance
3.
The apical Shoot grows faster after pruning
4.
It releases wound hormones
Parthenocarpy in grapes is induced by:-
1. cytokinins
2. gibberellins
3. topoisomerases
4. primase
Phytohormones are?
| 1. | hormones regulating growth from seed to adulthood |
| 2. | growth regulators synthesised by plants and influencing physiological process |
| 3. | hormones regulating flowering |
| 4. | hormones regulating secondary growth |
Which of the following statements is correct regarding short day plants (SDPs)?
1. They can flower in complete darkness if supplied with exogenous nutrients.
2. They are the same as long day plants.
3. They do not have a critical photoperiod.
4. All of these.
Pruning of plants promotes branching because the auxillary buds get sensitized to:-
1. ethylene
2. gibberellin
3. cytokinin
4. indole acetic acid
Vernalization is the process of
1. flower induction by high temperature treatment
2. inhabitation of flowering by low temperature treatment
3. flower induction by light treatment
4. acceleration of the ability of a plant to produce flowers by chilling treatment
Phytochromes play a role in
(1) seed germination
(2) flowering
(3) photomorphogenesis
(4) photosynthesis.
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