Question

Q.VII. Answer in brief: a.
a) State the various function of the leaf?

b) What is germination? List the conditions necessary for germination.

c)Describe the special characteristic of flows pollinated by insect.

d)List the function of mitochondria. Nucleus is the most important part of a cell.​

Answer 1

• Its main functions are photosynthesis and gas exchange. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. Most leaves have stomata, which open and close. They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere.

• All seeds need water, oxygen, and proper temperature in order to germinate. Some seeds require proper light also. Some germinate better in full light while others require darkness to germinate. When a seed is exposed to the proper conditions, water and oxygen are taken in through the seed coat.

• Hint: Insect-pollinated flowers are often sweetly-scented. They are large and have brightly colored petals. They usually contain nectar- to attract insects. They have pollen grains that are often sticky and spiky so that they can stick to the legs and body of insects.

• Mitochondria — often called the powerhouses of the cell — enable eukaryotes to make more efficient use of food sources than their prokaryotic counterparts. That's because these organelles greatly expand the amount of membrane used for energy-generating electron transport chains.

hope it helps!