Bioassay for gibberellin is
Important Questions on Plant Growth and Development
It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
Assertion The foolish seedling disease in rice seedlings is caused by a fungal pathogen, Gibberella fuzikuroi.
Reason E. Kurosawa reported the appearance of symptoms of the disease in uninfected rice seedlings when they were treated with sterile filtrates of the fungus and the active principle was identified as gibberellic acid.
The correct answer is:
Match the following concerning the activity/function and the phytohormone involved:-
| (a) | Fruit ripener | (i) | Abscisic acid |
| (b) | Herbicide | (ii) | |
| (c) | Bolting agent | (iii) | |
| (d) | Stress hormone | (iv) | Ethephon |
Select the correct option from following:-
Withstand desiccation and other factors unfavourable for growth
Promotes female flowers in cucumber
Increase absorption surface
Rapid elongation in internodes
Observe the given set of physiological activities regulated by different plant growth regulators and list out the number of activities promoted by auxins, cytokinin, gibberellin and ethylene, respectively.
a) Xylem differentiation
b) Improvement of the shape of an apple
c) Hastening the apple ripening
d) Delay of senescence
e) Promote nutrient mobilization
f) Lateral and adventitious shoot growth
g) Root growth and root hair formation
h) Increase of root absorption surface
