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 

 63%
From NCERT
AIPMT - 2012
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Photoperiodism was first characterized in:

1. tobacco

2. potato

3. tomato

4. cotton

 73%
AIPMT - 2010
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Importance of day length in the flowering of plants was first shown in:

1. Lemma

2. tobacco

3. cotton

4. Petunia

 83%
AIPMT - 2008
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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

AIPMT - 2007
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