1. The organisms that feed on dead organic matter ( detritus), are known as
a) Microorganism
b) Virus
c) Bacteria
d) Decomposers
Answer. d) Decomposers or Detritivores
2. Detritus food chains begin with
a) Plant
b) Microorganism
c) Detritivores
d) Detritus
Answer. d) Detritus ( or dead organic matter)
3. Who are the primary consumers in the detritus food chain?
a) Plant
b) Microorganism
c) Detritivores
d) Detritus
Answer. b) Detritivores, include bacteria, fungi, protozoans, etc.
4. Plant decomposers are
a) Monera and fungi
b) Fungi and plants
c) Protista and Animalia
d) Animalia and Monera
Answer. a) Monera and fungi;
Earthworms, bacteria, and fungi are considered as plant decomposers.
5. Which of the following acts as " Nature's scavengers"?
a) Insects
b) Microorganisms
c) Man
d) Animals
Answer. b) Microorganisms
6. The tropic level of Detritus is?
a) First Trophic level
b) Second Trophic level
c) Third trophic level
d) Zero trophic level
Answer. a) First Trophic level
7. The common detritivores in our ecosystem are
a) Bacteria
b) Fungi
c) Earthworm
d) insects
Answer. c) Earthworm
8. A decomposer can be classified into four types namely fungi, insects, earthworms, and bacteria. Which of the following is the most common type of decomposer.
a) Fungi
b) insects
c) Earthworm
d) bacteria
Answer. a) Fungi
9. Which one of the following has the largest population in a food chain?
a) Producers
b) Primary consumers
c) Secondary Consumers
d) Decomposers
Answer. d) Decomposers
10. If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because
a) Mineral movement will be blocked
b) The rate of decomposition will be very high
c) Energy flow will be blocked
d) Herbivores will not receive solar energy
Answer. a) Mineral movement will be blocked
11. Which of the following is the first stage of decomposition?
a) Fragmentation
b) Leaching
c) Catabolism
d) Mineralization
Answer. a) Fragmentation
12. Which of the following is the last stage of decomposition?
a) humification
b) Leaching
c) Catabolism
d) Mineralization
Answer. d) Mineralization
13. There are ......steps of decomposition
a) 3
b) 4
c) 5
d) 6
Answer. c) 5
There are five steps of decomposition, which include fragmentation, leaching, catabolism, humification, and mineralization.
14. The breaking of detritus into little pieces by detritivores is known as
a) Fragmentation
b) Leaching
c) Catabolism
d) Mineralization
Answer. a) Fragmentation
15. The process of releasing nutrients in the water and seeping into soil is known as
a) Humification
b) Leaching
c) Catabolism
d) Mineralization
Answer. b) Leaching
16. The process of breaking down complex molecules into simple molecules by various fungal and bacterial enzymes is known as
a) Fragmentation
b) Leaching
c) Catabolism
d) Mineralization
Answer. c) Catabolism
17. The process of the formation of dark-colored humus on the soil is known as
a) Humification
b) Leaching
c) Catabolism
d) Mineralization
Answer. a) Humification
18. The process of degradation of the humus to release inorganic nutrients is known as
a) Fragmentation
b) Leaching
c) Catabolism
d) Mineralization
Answer. d) Mineralization
19. Which one of the following processes during decomposition is correctly described?
a) Catabolism: The last step in the decomposition under fully anaerobic condition
b) Leaching: Water soluble inorganic nutrients rise to the top layers of soil
c) Fragmentation: Carried out by organisms such as earthworms
d) Humification: leads to the accumulation of dark colored substances humus which undergoes microbial action at a very fast rate.
Answer. c) Fragmentation: Carried out by organisms such as earthworms
Humification: leads to the accumulation of dark colored substances humus which undergoes microbial action at a very slow rate.
Leaching: Water soluble inorganic nutrients that go bottom layers of soil.
Catabolism: Catabolism is the breakdown of complex substances into their constituent parts (glucose, amino acids, and fatty acids).
Mineralization: The last step in the decomposition under fully anaerobic conditions.
20. The Breakdown of detritus into smaller particles by earthworms is a process called
a) Humification
b) Fragmentation
c) mineralization
d) Catabolism
Answer. b) Fragmentation
21. The slow rate of decomposition of fallen logs in nature is due to their
a) Anaerobic environment around them
b) Low cellulose content
c) low moisture content
d) poor nitrogen content
Answer. c) low moisture content
22. The food chain in which microorganisms breakdown the food formed by primary producers is
a) Parasitic food chain
b) Detritus food chain
c) Consumer food chain
d) Predator food chain
Answer. b) Detritus food chain
23.
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