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Q.
Auxin inhibits growth in
NTA AbhyasNTA Abhyas 2020
Solution:
Auxin induces shoot apical dominance. Due to a high concentration of auxin, the axillary buds are inhibited and this directly stimulates ethylene synthesis in lateral buds, causing inhibition of their growth and potentiation of apical dominance. The inhibitory effect is removed, when the apex of the plant is removed and the growth of lateral buds is enhanced. As auxin is sent to the part of the plant facing the light, growth gets promoted towards that direction. Auxin is produced in the stem, buds, and root tips and it promotes stem elongation, inhibits the growth of lateral buds. A plant movement called phototropism results due to this, which produces a curving of the plant stem tip toward the light.