CBSE Class 10 Science 2019 · Paper 31/1/1 · Question 11
What are plant hormones ? Name the plant hormones responsible for the following :
- (i)Growth of stem
- (ii)Promotion of cell division
- (iii)Inhibition of growth
- (iv)Elongation of cells
Answer
Gibberellins promote stem growth, cytokinins cell division, abscisic acid inhibits growth and auxins elongate cells.
Plant hormones (phytohormones) are chemical substances that help to coordinate growth, development and responses to the environment in plants.
(i) Growth of stem: gibberellins (auxins also help).
(ii) Promotion of cell division: cytokinins.
(iii) Inhibition of growth: abscisic acid (ABA).
(iv) Elongation of cells: auxins (gibberellins also help).
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