Statement I: | The rate of decomposition is not related to chemical composition of detritus and climatic factors. |
Statement II: | In a particular climatic condition, decomposition rate is faster if detritus is rich in lignin and chitin. |
A: | Detrivores perform fragmentation. |
B: | The humus is further degraded by some microbes during mineralization. |
C: | Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching. |
D: | The detritus food chain begins with living organisms. |
E: | Earthworms break down detritus into smaller particles by a process called catabolism. |
1. | D, E, A only | 2. | A, B, C only |
3. | B, C, D only | 4. | C, D, E only |
Statement I: | Decomposition is a process in which the detritus is degraded into simpler substances by microbes. |
Statement II: | Decomposition is faster if the detritus is rich in lignin and chitin. |
1. | Statement I is incorrect but Statement II is correct. |
2. | Both Statement I and Statement II are correct. |
3. | Both Statement I and Statement II are incorrect. |
4. | Statement I is correct but Statement II is incorrect. |
1. Decomposition | 2. Catabolism |
3. Fragmentation | 4. Humification |
Identify the correct set of statements with regard to the properties of humus.
(a) | Highly resistant to microbial action |
(b) | Dark-colored amorphous substance |
(c) | End product of detritus food chain |
(d) | Reservoir of nutrients |
(e) | Undergoes decomposition very fast |
Choose the correct answer from the options given below:
1. (a), (b), and (d) only
2. (a),(b) and (e) only
3. (a) and (b) only
4. (b), (c), and (a)
Which of the following is not correct regarding the decomposition of wastes?
(a) | Low temperature inhibits decomposition |
(b) | Warm and moist environment favors the process |
(c) | The process is anaerobic |
(d) | It is slower if detritus is rich in proteins and carbohydrates |
(e) | Detritus is degraded into simpler inorganic substance by fungal and bacterial enzymes |
Choose the correct answer from the options given below:
1. | (b) and (c) only | 2. | (c), (a) and (d) only |
3. | (c) and (d) only | 4. | (c), (d) and (e) only |
The rate of decomposition is faster in the ecosystem due to the following factors, except:
1. | Detritus rich in sugars |
2. | Warm and moist environment |
3. | Presence of aerobic soil microbes |
4. | Detritus richer in lignin and chitin |
Which one of the following processes during decomposition is correctly described?
1. | Humanification-Leads to the accumulation of a dark-coloured substance in humans which undergoes microbial action at a very fast rate |
2. | Catabolism-Last step decomposition under fully anaerobic condition |
3. | Leaching-Water soluble inorganic nutrients rise to the top layers of the soil |
4. | Fragmentation-Carried out by organisms such as earthworms |
Pheretima and its close relatives derive nourishment from:
1. Sugarcane roots
2. Decaying fallen leaves and soil organic matter
3. Soil insects
4. Small pieces of fresh fallen leaves of maize
The breakdown of detritus into smaller particles by earthworm is a process called:
1. Catabolism
2. Humification
3. Fragmentation
4. Mineralisation