Temperature is the main factor which stimulate the synthesis of seeds.and inthe germination of a seed heat is evolved so, the correct answer is option C

Explanation:

Seed germination is a process in which a seedling emerges from a seed and begins to grow into a new plant. This process is accompanied by several physiological and biochemical changes, one of which is the evolution of heat.

Evolution of Heat:
During seed germination, the stored food in the seed is broken down by enzymes into simpler molecules, which can be used by the growing seedling for its growth and development. This breakdown of food molecules is an exothermic process, which means that it releases heat. This heat is known as the heat of germination, and it is essential for the seed to complete its germination process.

Absorption of Heat:
While seed germination is accompanied by the evolution of heat, it also involves the absorption of heat from the environment. The seed needs to absorb a certain amount of heat from the surrounding soil or air to activate the enzymes responsible for breaking down the stored food molecules.

Starch Synthesis:
Starch synthesis is not a part of seed germination. Instead, it is the process of converting simple sugars into complex carbohydrates (starch) in plants. This process occurs during photosynthesis, where plants use sunlight to convert carbon dioxide and water into glucose, which is then stored as starch.

Fat Synthesis:
Fat synthesis is also not a part of seed germination. Instead, it is the process of converting simple molecules into complex lipids (fats) in plants. This process occurs in specialized cells called adipocytes, where fatty acids are synthesized and stored as triglycerides.

Conclusion:
Seed germination is a complex process that involves several physiological and biochemical changes. The evolution of heat is an essential part of seed germination, as it provides the energy required for the seedling to grow and develop. The absorption of heat from the environment is also necessary for the activation of enzymes responsible for breaking down stored food molecules. Starch synthesis and fat synthesis are not a part of seed germination and occur in different parts of the plant.