Q. No.How many of the following statements about decomposition are correct?
1. One statement is correct.
2. Two statements are correct.
3. Three statements are correct.
4. All four statements are correct.
| Statement I: | Decomposition is largely an oxygen-requiring process and depends on microbial activity. |
| Statement II: | The chemical composition of detritus and climatic factors control the rate of decomposition. |
| Statement III: | Detritus rich in lignin and chitin decomposes faster, whereas detritus rich in nitrogen and water-soluble substances decomposes slower. |
| Statement IV: | Warm and moist conditions favor decomposition, while low temperature and anaerobic conditions slow it down, leading to organic material buildup. |
1. One statement is correct.
2. Two statements are correct.
3. Three statements are correct.
4. All four statements are correct.
Subtopic: Decomposition |
100%
Level 1: 80%+
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Which of the following environmental conditions is MOST favourable for decomposition in an ecosystem?
| 1. | Low temperature and anaerobic conditions |
| 2. | High temperature and dry conditions |
| 3. | Warm and moist conditions with adequate oxygen |
| 4. | Cold and acidic conditions |
Subtopic: Decomposition |
98%
Level 1: 80%+
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Decomposition of detritus in an ecosystem does not involve:
1. Catabolism
2. Leaching
3. Humification
4. Photosynthesis
1. Catabolism
2. Leaching
3. Humification
4. Photosynthesis
Subtopic: Decomposition |
96%
Level 1: 80%+
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The breakdown of detritus into smaller particles by earthworm is a process called
1. humification
2. fragmentation
3. mineralisation
4. catabolism
Subtopic: Decomposition |
94%
Level 1: 80%+
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Why is the earthworm referred to as the "farmer’s friend"?
| 1. | It feeds on crops, promoting plant diversity. |
| 2. | It helps in loosening soil and breaking down complex organic matter. |
| 3. | It removes pests from the soil and protects crops. |
| 4. | It produces fertilizers that increase crop yield. |
Subtopic: Decomposition |
94%
Level 1: 80%+
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Decomposers are
1. Animalia and Monera
2. Protista and Animalia
3. Fungi and Plantae
4. Bacteria and Fungi
Subtopic: Decomposition |
94%
Level 1: 80%+
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Which factor slows down the rate of decomposition in a particular climatic condition?
1. High nitrogen and water-soluble substances in detritus
2. Warm and moist environment
3. Detritus rich in lignin and chitin
4. Increased microbial activity
1. High nitrogen and water-soluble substances in detritus
2. Warm and moist environment
3. Detritus rich in lignin and chitin
4. Increased microbial activity
Subtopic: Decomposition |
93%
Level 1: 80%+
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Decomposition results in the breakdown of complex organic matter into:
| 1. | Proteins used directly by top-level consumers |
| 2. | Complex carbohydrates and lignin-rich compounds |
| 3. | Inorganic substances such as carbon dioxide, water, and nutrients |
| 4. | Organic acids that never enter nutrient cycles |
Subtopic: Decomposition |
92%
Level 1: 80%+
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The decomposition of organic matter in an ecosystem is influenced by several factors. The rate of decomposition will be highest in an environment with:
| 1. | Low temperature, dry conditions, and anaerobic soil. |
| 2. | Extreme heat, acidic soil, and low microbial diversity. |
| 3. | High light intensity, nitrogen-deficient soil, and low organic matter. |
| 4. | Warm temperature, high humidity, and adequate oxygen. |
Subtopic: Decomposition |
92%
Level 1: 80%+
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In which of the following conditions will the rate of decomposition be the slowest?
| 1. | Detritus rich in lignin and chitin, low temperature, and anaerobic conditions |
| 2. | Detritus rich in nitrogen and sugars, warm and moist conditions |
| 3. | Detritus with high water content and favorable microbial activity |
| 4. | Detritus with low lignin content, high temperature, and abundant soil moisture |
Subtopic: Decomposition |
92%
Level 1: 80%+
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