Biodegradation

Q.

(a) Define decomposers. Name one decomposer.

(b) What is the role of decomposers in the ecosystem?

Q.

Disposable plastic plates should not be used because

(a) they are made of lightweight materials.

(b) they are made of toxic materials.

(c) they are made of biodegradable materials.

(d) they are made of non-biodegradable materials.

Q.

What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?

Q.

Why is non biodegradable waste more harmful than biodegradable waste?

Q.

Natural decomposers cannot break down ___________ waste.

Q. what is the role of the Decomposer in an environment explained in brief

Q.

Disposable plastic plates should not be used because

1. They are made of toxic materials

2. They are made of bio-degradable material

3. They are made of non-biodegradable material

4. They cannot be recycled

Q. What is a bipolymer?

Q. If a material is biodegradable, it means that it can be consumed by microorganisms.

1. True
2. False

Q. Question 26
Differentiate between biodegradable and non-biodegradable substances. Cite examples.

Q.

What is biodegradable and non biodegrdable wastes? Give example for each. [3 MARKS]

Q.

How can the wastes such as paper, plastic and metal objects be disposed of?

Q.

What does waste mangagement means? How can you help in reducing the problem of waste disposal? Give any two methods. [3 MARKS]

Q. What are the advantages of cloth bags over plastic bags during shopping?

1. Cloth bags are capable of carrying more things.
2. Cloth bags made of biodegradable material do not pollute our environment.
3. Cloth bags can be reused.
4. All of the above.

Q. Microorganisms do not help in biodegradation.

1. True
2. False

Q. Difference between biodegradable and non biodegradable .

Q. Are their mechanisms to treat biodegradable waste?

Q. The decomposers in an ecosystem :
(a) convert inorganic material to simpler forms
(b) convert organic material to inorganic forms
(c) convert inorganic material into organic compounds
(d) do not break down organic compounds

Q.

Question 32
What are decomposers? What will be the consequence of their absence in an ecosystem?

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

Q. Biodegradation is carried out by bacteria and some fungi.

1. False
2. True

Q. Which of the following is not a biodegradable waste?

1. Human and animal waste
2. Electronic devices
3. Plant products
4. Paper

Q. Organisms responsible for biodegradation play a role of decomposers in an ecosystem.

1. True
2. False

Q. How can the wastes such as paper, plastic and metal objects be disposed of?

Q.

Nowadays, the usage of bioplastics is promoted more than ordinary plastics because:

1. Compostable products can be turned into compost within six months.

2. All the above options are correct.

3. All bioplastics are biodegradable or compostable.

4. Bioplastics break down under the influence of natural elements.

Q. Disposable plastic plates should not be used because :
(a) they are made of light weight materials
(b) they are made of toxic materials
(c) they are made of biodegradable materials
(d) they are made of non-biodegradable materials

Q. Biodegradable wastes can be employed to produce

1. both of these
2. manure
3. none of these
4. biogas

Q. Nowadays, the usage of bioplastics is promoted more than ordinary plastics because:

1. All bioplastics are biodegradable or compostable.
2. Bioplastics break down under the influence of natural elements.
3. Compostable products can be turned into compost within six months.
4. They are more aesthetically pleasing.

Q. The increase in concentration of a chemical in organisms as we move from lower to higher trophic levels is called .

1. eutrophication
2. biomagnification
3. BOD

Q.

Decomposers: _____________ , _____________.