Advertisements
Advertisements
Question
Why is abscisic acid also known as a stress hormone?
Advertisements
Solution
- Abscisic acid is called a stress hormone as it induces various responses in plants against stress conditions.
- It increases the tolerance of plants to various stresses. It induces the closure of the stomata during water stress. It promotes seed dormancy and ensures seed germination under favourable conditions.
- It helps seeds withstand desiccation. It also helps in inducing dormancy in plants at the end of the growing season and promotes the abscission of leaves, fruits, and flowers.
APPEARS IN
RELATED QUESTIONS
List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
Which one of the plant growth regulators would you use if you are asked to:
Induce immediate stomatal closure in leaves.
Would a defoliated plant respond to photoperiodic cycle? Why?
Select the wrong statement from the following:
If the diameter of the pulley is 6 inches, length of pointer is 10 inches and distance travelled by pointer is 5 inches. Calculate the actual growth in length of plant.
Fill in the places with appropriate word/words.
Apical dominance as expressed in dicotyledonous plants is due to the presence of more ______ in the apical bud than in the lateral ones.
A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant growth regulator can be applied to achieve this?
Where are the following hormones synthesized in plants?
IAA
Where are the following hormones synthesized in plants?
Gibberellins
Where are the following hormones synthesized in plants?
Cytokinins
Which one of the plant growth regulators would you use if you are asked to:
Induce rooting in a twig
Which one of the plant growth regulators would you use if you are asked to:
Quickly ripen a fruit
Which one of the plant growth regulators would you use if you are asked to:
Delay leaf senescence
Which one of the plant growth regulators would you use if you are asked to:
Induce growth in axillary buds
Which one of the plant growth regulators would you use if you are asked to:
'Bolt' a rosette plant
