CBSE Class 10 Science 2018 · Paper 31(B) · Question 10
How does chemical co-ordination occur in plants ?
Answer
Plants have no nervous system; hormones made in the stimulated part diffuse to nearby cells, which respond by changing growth.
Plants have no nervous system; chemical co-ordination in plants is brought about by chemical compounds called plant hormones.
(i) When a part of the plant is stimulated, cells in that specific part make and release a hormone.
(ii) The hormone diffuses to the neighbouring cells, the area of action.
(iii) The cells that recognise the hormone respond, bringing about the required change in growth; this is control and co-ordination.
Examples: auxin makes cells grow longer (the shoot bends towards light); gibberellins help the stem to grow; cytokinins promote cell division; abscisic acid inhibits growth and causes wilting of leaves.
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