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The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :
A plant growth inhibitor hormone which causes wilting of leaves is called :
Where are auxins synthesized ? How do they promote phototropism ?
Distinguish between hormonal co-ordination in plants and animals.
How is brain and spinal-cord protected against mechanical injuries ?
What are tropic movements ? Give an example of a plant hormone which (1) inhibits growth and (2) promotes cell division.
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