Decomposition

Q.

The three biotic components of an ecosystem are ------, -------- and ------.

Q. Which of the following is called a detritivore ?

1. An animal feeding on another animal
2. An animal feeding on dead organic material
3. A plant feeding on a animal
4. An animal feeding on a plant

Q. Decomposers like fungi and bacteria are
(i) autotrophs (ii) heterotrophs
(iii) saprotrophs (iv) chemo-autotrophs.
Choose the correct answer.

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

Q.

Plant decomposers are

1. animalia and Monera

2. monera and fungi

3. fungi and plants

4. protista and animalia

Q.

The term "detritivore" includes

1. autotrophs

2. decomposers

3. secondary consumers

4. primary consumers

Q. Do you think there is any limitation in a detritus food chain?

Q.

Decomposers are

1. Protista and Monera

2. Bacteria and Fungi

3. Fungi and Plantae

4. Animalia and Monera

Q. Assertion :In a terrestrial ecosystem, detritus food chain is a major conduit for energy flow. Reason: Solar energy is direct source of energy supply in detritus food chain.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Which of the following belongs to abiotic components of environment?

1. Air, water, light

2. Plants

3. Plants and animals

4. Plants, animals and microorganisms

Q. Decomposers are ___.

1. Autotrophs
2. Heterotrophs
3. Autoheterotrophs
4. Organotrophs

Q. (a) Taking an example of a small pond, explain how the four components of an ecosystem function as a unit.
(b) Name the type of food chain that exists in a pond.

Q.

Which one of the following has the largest population in a food chain?

(a) Producers

(b) Primary consumers

(c) Secondary consumers

(d) Decomposers

Q. Which one of the following shows heterotrophic nutrition and mixotrophic nutrition?

1. Heterotrophic nutrition- Rhizopus, Mixotrophic nutrition- Euglena
2. Heterotrophic nutrition- Euglena, Mixotrophic nutrition- Rhizopus
3. Heterotrophic nutrition- Pinus, Mixotrophic nutrition- Rhizopus
4. Heterotrophic nutrition- Rhizopus, Mixotrophic nutrition- Pinus

Q. A decomposer is most likely to utilize which of the following modes of nutrition?

1. Parasitic
2. Saprotrophic
3. Both (a) and (b)
4. Ingestion

Q. A detritivore is a/an

1. Animal feeding on plant matter
2. Animal feeding on decaying organic matter
3. Plant feeding on an animal
4. Animal feeding on another animal

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. Choose the correct answer from the alternatives given.
What organisms are capable of photosynthesis?

1. Plants only
2. Plants and algae only
3. Plants and some bacteria only
4. Plants, algae and some bacteria

Q. A detritus food chain accounts for more energy flow than the grazing food chain, since most organisms die without being eaten

1. True
2. False

Q. Which of the following can be used as a catalyst during the production of biodiesel?

1. Sodium hydroxide
2. Calcium hydroxide
3. Potassium hydroxide
4. None of the above

Q. Assertion :In a terrestrial ecosystem, detritus food chain is a major conduit for energy flow. Reason: Solar energy is direct source of energy supply in detritus food chain.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Organisms in all trophic levels may be consumed by decomposers

1. True
2. False

Q. The bacteria which attack dead animals are

1. First link of the food chain and are known as primary producers
2. Second link of the food chain and are herbivorous
3. Third link of the food chain and are tertiary consumers
4. The end of food chain and are decomposers

Q. Which of the following is not an example of pray predator relationship?

1. Tiger eating a deer
2. Plant Nepenthes trapping an insect
3. Bacteria decomposing organic matter
4. Crocodile killing a man

Q. Which one shows the detritus food chain?

1. $Grass\to Insects\to Snakes$
2. $Plankton\to Smallfish\to LArgefish$
3. $Organicwastes\to Bacteria\to Molluscs$
4. All the above

Q. Decomposers like fungi and bacteria are
(i) autotrophs
(ii) heterotrophs
(iii) Saprotrophs
(iv) Chemo-autotrophs.
Choose the correct answer.

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

Q. Regarding the given assertion and reason, choose te right option.
Assertion [A]: Decomposers may be excluded from the food chains.
Reason [R]: They act at all trophic levels of food chains.

1. Both the A and R are true and R explains A
2. Both A and R are true and R does not explain A
3. A is true and R is false
4. Both A and R are false

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

1. False
2. True

Q. In a natural ecosystem, decomposers include

1. Only microscopic animals
2. Only bacteria and fungi
3. The above two types of organisms plus microscopic animals
4. None of the above

Q.

Plant decomposers are

1. Monera and Fungi

2. Fungi and plants

3. Protista and Animalia

4. Animalia and Monera