Which of the following is the site for perception of light/dark in plants?
1. Root apex
2. Shoot apex
3. Leaves
4. Flower
A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
1. cause increased flower production.
2. have no effect upon flowering.
3. inhibit flowering.
4. stimulate flowering.
Phytochrome is a
(1) flavoprotein
(2) glycoprotein
(3) lipoprotein
(4) chromoprotein
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?
1. Mutated
2. Embolised
3. Etiolated
4. Defoliated
Photoperiodism was first characterised in :-
1. tobacco
2. potato
3. tomato
4. cotton
Importance of day length in flowering of plants was first shown in
1. Lemna
2. tobacco
3. cotton
4. Petunia
Phytochromes play a role in
(1) seed germination
(2) flowering
(3) photomorphogenesis
(4) photosynthesis.
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.
Refer the given figures on photoperiodism and select the correct option.
A physiological response of plants to the duration of light and darkness is a:-
(1) daily phase cycle
(2) circadian rhythms
(3) biological clock
(4) photoperiodism