Biodegradation

Q. What makes plastics non-biodegradable?

1. Plastics have a lot of carbon in it.
2. Plastics cannot be decomposed by microbes.
3. Plastics require high temperature to degrade.
4. Plastics have organic additives in it.

Q. The accumulation and progressive increase in the concentration of non-biodegradable, harmful chemicals at different trophic levels in a food chain is called

1. Biomagnification
2. Food web
3. Biogeochemical cycle
4. Trophic level

Q. The phenomenon occurs due to the accumulation of certain pollutants that increase in concentration along the food chain. Identify the phenomenon.

1. Eutrophication
2. Pollution
3. Deforestation
4. Biomagnification

Q.

How can we reuse paper and glass?

Q.

Which of the following components of municipal solid wastes can be recycled?

1. Paper and paper products

2. Glass

3. All of the above

4. Metal objects

Q.

Which group has only biodegradable materials?

1. Wool, grass, paper

2. Cotton, polyester, paper

3. Dried leaf, plastic bag, lemon

4. Wool, crude oil, ceramics

Q. State whether true or false.
The source of energy for decomposers are the dead and decaying matter in the environment.

1. True
2. False

Q.

Assertion: Plastic bags remain as harmful substances in both soil and water.

Reason: Soil microflora lacks bio-catalysts for rendering plastics harmless.

1. A is true and R is false

2. Both A and R are true

3. A is false, R is true

4. Both A and R are false

Q. The process of break down of detritus into smaller particles by detritivores is called ___ .

Q. In a polluted environment, the maximum concentration of a pollutant will be found in:

1. Primary producers
2. Tertiary consumers
3. Primary consumers
4. Secondary Consumers

Q. What is DDT among the following?

1. An organic fertilizer
2. A fertilizer
3. Biodegradable pollutant
4. Non-biodegradable pollutant

Q. ________ is the term used to describe the increase in concentration of non-biodegradable substance in successive trophic levels.

1. Eutrophication
2. Biomagnification
3. Stratification
4. Nutrient contamination

Q. Which statement is correct about the role of decomposers in the environment?

1. Decomposers break down the dead and decaying organic matter.
2. Decomposers return the nutrients to the soil.
3. All of the above.
4. Decomposers play a very important role in the nutrient re-cycling.