During seed germination its store food is mobilized by_______a)ABAb)Cytokininc)Ethylened)GibberellinCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Gibberellin is a type of plant hormone. In seed the stored food is starch Gibberellins stimulate the synthesis of two enzymes i.e protease and α-amylase which are involved in the formation of sugar from starch. The proteases convert an inactive β-amylase to the active form. The active β-amylase and α-amylase together convert starch to glucose which is mobilized to meet the metabolic demands of the embryo during the germination of seed.

Answer

Function of Gibberellins -

Internodes elongation

Bolting

Promotes seed germination

Promotes flowing in long day plants and inhibit it in short day plants.

Delay Senescene

Induce parthenocarpy in pome fruits

Break bud and seed dormancy

- wherein

Commercially used to increase yield of malt from barley.

Gibberellins promotes seed germination and secretes enzyme to break stored food in seed

Answer

Gibberellin induces aleurone cells to secrete enzyme to break stored food in seed. Option D is right.

Answer

Seed Germination and Food Mobilization

Seed germination is the process by which a seed develops into a new plant. It involves the activation of metabolic processes that lead to the growth and development of the embryo within the seed. During germination, the stored food reserves in the seed are mobilized to provide energy and nutrients for the growing embryo until it can establish its own photosynthetic system.

Role of Gibberellin in Food Mobilization

Gibberellins are a group of plant hormones that play a crucial role in seed germination and plant growth. They are responsible for various physiological processes, including the mobilization of stored food reserves in seeds.

Gibberellins stimulate the production and secretion of enzymes called hydrolytic enzymes. These enzymes break down complex food reserves such as starch and proteins into simple sugars and amino acids, which can be easily transported and utilized by the growing embryo.

Hydrolytic Enzymes and Food Mobilization

During seed germination, hydrolytic enzymes such as amylase, protease, and lipase are produced and activated. These enzymes catalyze the breakdown of starch, proteins, and lipids respectively. Let's understand the role of each enzyme in food mobilization:

1. Amylase: Amylase is responsible for the breakdown of starch into glucose molecules. Starch is the primary energy storage molecule in seeds. By breaking it down, amylase provides a readily available energy source for the growing embryo.

2. Protease: Protease enzymes break down proteins into amino acids. Proteins serve as a source of nitrogen and amino acids, which are essential for building new proteins and other cellular components during seed germination.

3. Lipase: Lipase enzymes hydrolyze lipids or fats into fatty acids and glycerol. Lipids are another important source of energy in seeds. By breaking down lipids, lipase releases fatty acids that can be utilized by the embryo for energy production.

Conclusion

In conclusion, during seed germination, the stored food reserves in the seed are mobilized to provide energy and nutrients for the growing embryo. This process is mediated by gibberellins, which stimulate the production of hydrolytic enzymes. These enzymes, such as amylase, protease, and lipase, break down complex food reserves into simpler forms that can be easily transported and utilized by the developing embryo. Therefore, the correct answer is option D, 'Gibberellin.'

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