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Q.
Mobilisation of stored food in germinating seed is triggered by
Plant Growth and Development
Solution:
The process by which the dormant embryo of seed resumes active growth and forms a seedling is known as germination. When conditions are appropriate, the embryo will renew its growth and the seed germinates. But this event is preceded by a series of biochemical reactions. Those include the release of hydrolytic enzymes that digest and mobilise the stored food reserve. It is concluded from various experiments that GA is provided by embryo for the activation of aleurone layer to secrete $\alpha$ -amylase and $\beta$ -amylase. These hydrolyse the starch stored in endosperm into glucose which is necessary for use both as respiratory substrate and as a source of carbon reguired for growth.