1. List the factors which have made life exist on earth.
2. Define the following-
a. Lithosphere
b. Population
c. Biotic community d. Food web e Trophic level
3. What is an ecosystem?
4. Why is the use of DDT not advisable?
5. Construct a simple food chain.
6. What may happen if all herbivores are killed in a terrestrial ecosystem?
7. In any food chain trophic level-1 is occupied by green plants. Give
reason
Answers
Answer:
A1} a. Water
b. Atmosphere
c. Temperature
A2] a) Lithosphere is the outer part of the solid earth composed of rock essentially like that exposed at the surface, consisting of the crustand outermost layer of the mantle, and usually considered to be about 60 miles (100 kilometers) in thickness.
b) Population is the whole number of people or inhabitants in a country or region.
c) Biotic Community is the group of organisms that live together and interact with each other within an environment or habitat.
d) Food webs show how plants and animals are connected in many ways. The arrow points from the organism being eaten to the organism that eats it.
e) The trophic level of an organism is the number of steps it is from the start of the chain.
A3) All the plants and animals in a particular area considered together with their surroundings is known as Ecosystem.
A4》DDT is not advisable because it is effective, relatively inexpensive to manufacture, and lasts a long time in the environment.
A5> Grass → Grass hopper → Frog → Snake → Eagle.
A6- In case if all herbivores are killed in a terrestrial ecosystem, at last all the life will die. It is because, if there is noherbivores, then there will be no source of food for the carnivores. Thus, the balance of ecosystem will fall down and the life would come to an end.
A7= In any food chain trophic level-1 is occupied by green plants. This is because all living beings need food energy and green plants are the only producers. They make their own food and are not dependent on any other organism for food. Animals cannot make their own food and depend on plants for food energy to survive. For this reason, green plants occupy the first trophic level in every food chain.
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