Decomposers

Q.

Are carnivores primary or secondary consumers?

Q. In an ecosystem, bacteria and fungi perform the role of .

1. producers
2. consumers
3. decomposers

Q.

If decomposers are removed what will happen to the ecosystem?

1. Energy cycle will stop.

2. Mineral cycle will stop.

3. Consumers will not be able to absorb solar energy.

4. Rate of decomposition of minerals will increase.

Q. ___ are organisms which break down dead plant and animal remains into simpler organic and inorganic matter.

Q.

Choose the correct sequences:

1. CO₂ in the atmosphere → decomposers → organic carbon in animals → organic carbon in plants

2. CO₂ in the atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil

3. Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers

4. Organic carbon in animals → decomposers → CO₂ in the atmosphere → organic carbon in plants

Q.

Bacteria plays important role in an ecosystem because

1. they act as consumers.

2. they act as parasites.

3. they act as producers.

4. they act as decomposers.

Q.

Name one organism for tertiary consumers.

Q.

What is an institutional biosafety committee?

Q.

The decomposers in an ecosystem

1. convert inorganic material to simpler forms

2. convert organic material to inorganic forms

3. convert inorganic materials into organic compounds

4. do not breakdown organic compounds

Q.

In natural ecosystem decomposers include

1. (a) Only microscopic animals

2. (b) Only bacteria and fungi

3. (c) Herbivores and carnivores

4. (d) Both (a) and (b)

Q.

What is biosafety level 4?

Q. Choose the correct option.

1. A - Autotrophs, B - Saprophytes, C - Scavengers, D - Consumers , E - Abiotic factors
2. A - Autotrophs, B - Consumers, C - Saprophytes, D - Scavengers, E - Abiotic factors
3. A - Abiotic factors, B - Consumers, C - Scavengers, D - Saprophytes, E - Autotrophs
4. A - Autotrophs, B - Consumers, C - Scavengers, D - Saprophytes, E - Abiotic factors

Q.

What is biosafety level 3?

Q.

In a natural ecosystem, decomposers include

1. parasitic algae

2. bacteria and fungi

3. macroscopic animals

4. all of the above

Q.

Explain that decomposers are important

Q.

5. Which of the following statements regarding nitrogen is/are incorrect?

I. About 3/4 of the atmosphere is made up of nitrogen.

II. Living organisms use nitrogen for respiration

III. Nitrogen is a part of the photosynthesis process

1. Only statement I is incorrect.

2. Only statement III is incorrect.

3. Both statements I and III are incorrect.

4. Both statements II and III are incorrect.

Q.

How do earthworms return nutrients to the ecosystem?

Q.

What is the term used for the organism that can convert dead and decaying matter into simpler form?

Q.

Explain the following terms: Decomposers

Q.

Which biosafety level carries the greatest risk?

Q.

Oxygen is harmful to:

1. Ferns

2. Nitrogen fixing bacteria

3. Chara

4. Mango tree

Q. Identify the correct statements about manure.
i) Manure contains large quantities of organic matter.
(ii) It increases the water-holding capacity of the soil.
(iii) Manure is produced synthetically.
(iv) Its excessive use pollutes the environment because it is made from animal wastes.

1. (i) and (iii)
2. (iii) and (iv)
3. (i) and (ii)
4. (ii) and (iii)

Q. Very Short Answer Type Questions :
What type of organisms are primary consumers?

Q. State whether the following statement are true or false.
Statement 1: Microbes are used in cleaning up of the environment.
Statement 2: Microbes also facilitates the breakdown of dead and decaying matter.

1. 
   Statement 1: True
   Statement 2: False
2. Statement 1: True
   Statement 2: True
3. Statement 1: False
   Statement 2: False
4. Statement 1: False
   Statement 2: True

Q. A manure should supply which of the following nutrients to plants?

1. Nitrogen
2. Phosphorus
3. Potassium
4. All of the above

Q. _____ are called 'nature's cleaners'.

1. Producers
2. Consumers
3. Decomposers
4. Carnivores

Q. State whether the following statement are true or false.
Statement 1: Microbes are used in cleaning up of the environment.
Statement 2: Microbes also facilitates the breakdown of dead and decaying matter.

1. 
   Statement 1: True
   Statement 2: False
2. Statement 1: True
   Statement 2: True
3. Statement 1: False
   Statement 2: False
4. Statement 1: False
   Statement 2: True

Q. Saprophytes eat dead and decaying matter.

1. True
2. False

Q. Write what of manufacturing synthetic fibries help in coservation in forest?

Q. Which of the following is a correct option with reference to pathogenic bacterial and DDT?

1. Bacteria can undergo multiplication and DDT is degraded by living cells.
2. Bacteria can undergo biological magnification and DDT can be degraded by living cells
3. Bacteria can be degraded by living cells and DDT can not be degraded by living cells.
4. Bacteria can undergo biological magnification and DDT can not be degraded by living cells.