Q U I

Z

Q. What is the ultimate source of energy?

Answer: Sun (Solar energy) Q. Which disease is caused in human

beings due to a depletion of ozone layer in the atmosphere?

Answer: Disease caused – i) skin cancer ii) cataract iii) defect in immune

system

Q. Differentiate between food chain & food web.

Answer: Q. State one function of ozone

layer in the atmosphere. How is it formed?

Answer: Ozone layer protect living organisms of earth from the disease causing UV radiation.

O₂ UV O + O O+O₂ O₃ (ozone)

FOOD CHAIN FOOD WEB

1. It is a sequence of living organisms in which one consumes another to transfer food energy.

2. In a food chain, each organism in a trophic levels gets food from one group of organisms.

3. It forms a part of a food web.

4. It indicates the transfer of food in a path.

1. Food web is the network of interconnected food chains operating in an ecosystem.

2. In a food web, each organism in a trophic level gets food from more than one group of organisms.

3. It is composed of many food chains.

4. In this, the food is transferred in different paths to reach the ultimate consumer.

FOOD WEBFOOD CHAIN

Q. What are producers? How they are different from consumers?

Answer: Organisms which can make their own and others food (autotrophs) are called producers.

They are different from consumers because consumers depend on producers for their food.

WHY ARE BACTERIA AND FUNGI CALLED DECOMPOSERS? LIST ANY TWO ADVANTAGES.Answer: Bacteria and fungi are

called decomposers because they feed on dead matter of plants and animals.

They are advantageous because they act as a cleansing agent of the environment and maintains the nitrogen balance in the environment.

WHAT DOES COLIFORM BACTERIA INDICATES?

Answer: Presence of coliform bacteria in water indicates contamination of water by disease causing bacteria.

Q. Two ways to check levels of pollution is

---------------- and -----------------------.

WHY WE SHOULD MANAGE RESOURCES???

They may get exhausted if overused or misused.

To conserve our environment. To preserve biodiversity for

stability of ecological system. It will bring sustainable

development in a nation.

COLIFORM BACTARIA

pH

STAKEHOLDERS OF FORESTS

Local people around forest . The forest department of

government . The industrialists. Nature and wildlife enthusiastic .

ADVANTAGE OF GROUND WATER OVER SURFACE WATER ………

It does not evaporate . Spreads out to recharge well .

It is protected from contamination of human and animal waste .

THANK YOU………