Question
Biology Question on plant growth and development
Leaf fall can be prevented with the help of
A
abscisic acid
B
auxins
C
florigen
D
cytokinins.
Answer
cytokinins.
Explanation
Solution
Cytokinins delay senescence of leaves and other organs by mobilisation of nutrients. Abscissic acid promotes abscission of flowers and fruits. Its excessive presence stops protein and RNA synthesis in the leaves and hence stimulates their senescence.