The movement of pollen tube from stigma to micropyle is an example of:
Thigmotropic
Geotropic
Chemotropic
Hydrotropic
Who discovered photoperiodism?
F.W. Went
Boysen
Kurosowa
Garnes and Allard
Which of the following acts as a stress hormone?
Indole acetic acid
Gibberellic acid
Ethylene
Abscisic acid
Which hormone is produced by plants during drought condition?
Naphthalene acetic acid
Zinc is essential for the biosynthesis of:
Gibberellin
Cytokinin
IAA
Where are the flowering hormones synthesized?
Flowers
Leaves
Stem
Buds
Which of the following is commonly known as 'Indian telegraph plant'?
Butea monosperma
Crotalaria juncea
Madhuca indica
Desmodium gyrans
Which of the following statements about stationary phase is true?
Growth is slow due to the utilization of reserve food materials
Growth is slow due to the limitation of nutrients.
Growth is high and reaches maximum
Both a and b
Nastic movements produced in response to the stimulus of contact with objects are called:
Seismonasty
Thigmonasty
Photonasty
Thermonasty
Gibberellic acid has been successfully employed to induce flowering in:
Long day plants under short day conditions
Short day plants under long day conditions
Day neutral plants
All of the above
