Question

6. Why does a seed need these a.Oxygen b. Water c. Warmth.
7. Explain why birds flying high up in the sky not cast their shadow on the earth.​

Answer 1

Answer:

a.Oxygen

Seeds need oxygen so that they can produce energy for germination and growth. The embryo gets energy by breaking down its food stores. Like all organisms, this is done through a process known as aerobic respiration. —a series of reactions where energy is released from glucose, using oxygen.

Solution: The birds flying in the sky do not cast their shadow on the earth because the umbra is absent and the penumbra is too large and too faint that it is not visible as the distance of earth is very large from the bird.

Answer 2

Answer:

Ans6)

◇Oxygen

Seeds need oxygen so that they can produce energy for germination and growth. The embryo gets energy by breaking down its food stores. Like all organisms, this is done through a process known as aerobic respiration. —a series of reactions where energy is released from glucose, using oxygen.

◇Water

Water allows the seeds to absorb nutrients from soil fungi, but it also softens the seed coating. Because these seeds have limited viability, the inside embryo will die without fast connection between the soil fungi and seed, a process made possible by water.

◇Warmth

Warmth is needed to speed up the chemical reactions that take place in the seed. Warmth also speeds up the making of new cells when the plant embryo is growing. Therefore low soil temperatures for example, will slow down the rate of germination.

Explanation:

I have given answers above.