[Short Notes ] NCERT Class VI – The Living Organisms and Their Surroundings – Chapter 9 – Part-2
Read complete book (must) at :NCERT Class VI – The Living Organisms and Their Surroundings – Chapter 9
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Aquatic Habitats
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Many sea animals have streamlined bodies to help them move easily in water.
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There are some sea animals like squids and octopus, which do not have 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.
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These animals have gills to help them use oxygen dissolved in water.
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Some sea animals like dolphins and whales that do not have gills.
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They breathe in air through nostrils or blowholes that are located on the upper parts of their heads.
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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.
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Ponds and lakes
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Some of the plants have their roots fixed in the soil below.
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In aquatic plants, roots are much reduced in size and their main function is to hold the plant in place.
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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.
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Some aquatic plants are totally submerged in water.
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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.
