The term "detritivore" includes
1. decomposers
2. primary consumers
3. secondary consumers
4. autotrophs
Match the following and select the correct option.
Column I Column II
A. Earthworm 1. Pioneer species
B. Succession 2. Detritivore
C. Ecosystem service 3. Natality
D. Population growth 4. Pollination
A B C D
(1) 1 2 3 4
(2) 4 1 3 2
(3) 3 2 4 1
(4) 2 1 4 3
Which one of the following processes during decomposition is correctly described?
1. Fragmentation-Carried out by organisms such as earthworms
2. Humification-Leads to the accumulation of a dark-coloured substance humus, which
undergoes microbial action at a very fast rate
3. Catabolism-Last step in the decomposition under fully anaerobic condition
4. Leaching-Water soluble inorganic nutrients rise to the top layers of soil.
The slow rate of decomposition of fallen logs in nature is due to their
1. low moisture content
2. poor nitrogen content
3. anaerobic environment around them
4. low cellulose content
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.
Most animals that live in deep oceanic waters are
(1) Tertiary consumers
(2) Detritivores
(3) Primary consumers
(4) Secondary consumers
The important step in the process of decomposition in order is:
| 1. | Catabolism → Fragmentation → Leeching → Humification → Mineralization |
| 2. | Catabolism → Fragmentation → Humification → Leeching → Mineralization |
| 3. | Fragmentation → Humification → Catabolism → Leeching → Mineralization |
| 4. | Fragmentation → Leeching → Catabolism → Humification → Mineralization |
Why do we call the earthworm as the farmer’s friend?
| 1. | It eats the pests. |
| 2. | It prevents the growth of weeds. |
| 3. | It makes the soil fertile by burrowing. |
| 4. | It helps in the breakdown of complex organic matter as well as in loosening of the soil. |
Which of the following is not a step in the process of decomposition?
1. Fragmentation
2. Leaching
3. Anabolism
4. Humification.
Which of the following statement is correct?
1. Dead plant and animals remains, including fecal matter, constitute detritus,
2. Detritus is the product of decomposition.
3. Breakdown of complex inorganic matter into organic substances like CO₂ and nutrients is called as decomposition.
4. Decomposition is a single step process.
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