Match the following:
|Column I||Column II|
|(a) Biosphere||(1) Blanket of air which surrounds the earth|
|(b) Atmosphere||(2) Domain of water|
|(c) Hydrosphere||(3) Gravitational force of earth|
|(d) Environment||(4) Our surroundings|
|(5) Narrow zone where land, water and air interact|
|(6) Relation between the organisms and their surroundings|
Answer: (a) 5, (b) 1, (c) 2, (d) 4
Question 1: Which is not a natural ecosystem?
Answer: (b) Aquarium
Question 2: Which is not a component of human environment?
Answer: (a) Land
Question 3: Which is a human made environment?
Answer: (c) Road
Question 4: Which is a threat to environment?
Answer: (b) Growing population
Question 1: What is an ecosystem?
Answer: An ecosystem is the relation between the living organisms, as well as the relation between the organisms and their surroundings.
Question 2: What do you mean by natural environment?
Answer: Natural environment is the environment that is given to us by nature and comprises of land, water, air, plants and animals.
Question 3: Which are the major components of the environment?
Answer: The major components of the environment are – natural, human made and human.
Question 4: Give four examples of human made environment.
Answer: Four examples of human made environment are (a) Roads, (b) Monuments, (c) Industries and (d) Buildings
Question 5: What is lithosphere?
Answer: Lithosphere is the solid crust or the hard top layer of the earth.
Question 6: Which are the two major components of biotic environment?
Answer: Plants and animals are the major components of the biotic environment.
Question 7: What is biosphere?
Answer: Plant and animal kingdom together make the biosphere. It is a narrow zone of the earth where land, water and air interact with each other to support life.
Question 8: Give reason for the following:
(a) Man modifies his environment
Answer: Human beings have to fulfill their various needs from the environment. For some of the needs, human beings need to modify the environment. For example; for making paper and furniture, man needs wood. Wood can be obtained by cutting trees. Felling of trees modifies the environment.
(b) Plants and animals depend on each other
Answer: Animals depend on plants for oxygen through photosynthesis and also for food. They also use plants as shelter and also to hide from predators. Plants depend on animals for seed dispersal, pollination and also for nutrients which the plant gets when the animal dies and decomposes.
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