GIVE REASONS FOR THE FOLLOWING
(1) The leaves are reduced to spines in desert plants.
(2) A fish does not survive outside water.
(3) Trees of lower areas of rainforest have broad leaves.
Answers
Answer:
We already discussed how fish adapts to live in the sea. Many sea animals have streamlined bodies to help them move easily in water. There are some sea animals like squids and octopus, which do not have this streamlined shape. They stay deeper in the ocean, near the seabed and catch any prey that moves towards them. However, when they move in water they make their body shapes streamlined. These animals have gills to help them use oxygen dissolved in water.
There are some sea animals like dolphins and whales that do not have gills. They breathe in air through nostrils or blowholes that are located on the upper parts of their heads. This allows them to breathe in air when they swim near the surface of water. They can stay inside the water for a long time without breathing. They come out to the surface from time to time, to breathe in air. Did you ever see this interesting activity of dolphins in television programme or films on ocean life?
Ponds and lakes
Have you seen plants growing in ponds, lakes, rivers and even some drains? Go on a field trip to a nearby pond, if possible, and try to draw the kinds of plants that are seen there. How are the leaves, stems and roots of these plants placed?
Some of these plants have their roots fixed in the soil below the water . In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size and their main function is to hold the plant in place.
The stems of these plants are long, hollow and light. The stems grow up to the surface of water while the leaves and flowers, float on the surface of the water.
Some aquatic plants are totally submerged in water. All parts of such plants grow under water. Some of these plants have narrow and thin ribbon-like leaves. These can bend in the flowing water. In some submerged plants, leaves are often highly divided, through which the water can easily flow without damaging them.
Frogs usually have ponds as their habitat. Frogs can stay both inside the pond water as well as move on land. They have strong back legs that help them in leaping and catching their prey. They have webbed feet which help them swim in water.
,
Explanation:
I don't not more thing about this chapter
Answer:
Trees of lower areas of rainforest have broad leaves.