Question

B. SHORT ANSWER TYPE QUESTIONS
1. What is meant by adaptation ?
2. Give two characteristics of the animals showing aquatic adaptation.
3. What happens during respiration ?
4. What is meant by habitat? Name the various habitats in the biosphere.
5. Distinguish between aquatic and terrestrial habitats.​

Answer 1

Answer:

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Explanation:

1) the act of adapting or the state of being adapted. 2. something produced by adapting: an adaptation of a play for television. 3. a. any beneficial alteration in an organism resulting from natural selection by which the organism survives and multiplies in its environment.

2) •The animals which grow, multiply and adjust themselves inside water are called aquatic animals. ...

•The body of aquatic animals is streamlined i.e. ...

•The body is provided with air sacs or air bladder so that they do not sink when they stop swimming.

•They have paired and unpaired fins, flippers and paddles and webbed legs for swimming.

3) respiration the process by which cells get energy from glucose. plants and animals respire. this is happening continuously. during respiration the cells break down food molecules (like sugar) and release the energy stored in the food.

4) A Habitat is an ecological or environmental area that is inhabited by a particular Species of Animal, Plant or other type of organism.

Type # 1. Marine Habitat:

The marine habitat is the largest of all habitats. The seas, oceans and bays have occupied about 70% of the earth’s surface. The physical features of the marine habitat are relatively stable.

Type # 2. Fresh-Water Habitat:

Fresh-water habitat is the smallest of the three primary environments. The habi­tat is extremely variable. In depth such habitats vary from shallow rain puddles to Lake Baikal of U.S.S.R. that reaches a depth of 5712 feet. Temperature of these habitats varies from frozen to boiling condition

Type # 3. Estuarine Habitat:

Estuarine or Brackish zone is formed in those regions where a river meets a sea. The composition of water in this zone undergoes constant change. The concentra­tion of dissolved substances in such habitats is unstable. At high tides such habitats experience maximum salinity. Salinity decreases during low tide and periods of heavy rain.