Through their effect on plant growth regulators, what do the temperature and light control in the plants ?

1. Flowering 

2. Closure of stomata

3. Fruit elongation 

4. Apical dominance 

Subtopic:  Photoperiodism | Vernalization |
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Photoperiodism was first characterized in

1. tobacco

2. potato

3. tomato

4. cotton

Subtopic:  Photoperiodism |
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Importance of day length in flowering of plants was first shown in

1.  Lemma

2.  tobacco

3.  cotton

4.  Petunia

Subtopic:  Photoperiodism |
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The wavelength of light absorbed by Pr form of phytochrome is :

1. 640 nm

2. 680 nm

3. 720 nm

4. 620 nm

Subtopic:  Photoperiodism |
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