A. | Detrivores perform fragmentation. |
B. | The humus is further degraded by some microbes during mineranlization. |
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 |
1. | alien species | 2. | endemic species |
3. | exotic species | 4. | keystone species |
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 correct incorrect but statement II is correct. |
2. | Both statement I and 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 |
Given below are two statements:
Statement I: | Pyramid of energy is always upright and is the most efficient. |
Statement II: | Pyramid of biomass in sea is generally inverted. |
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Statement I is correct but Statement II is incorrect.
2. Statement I is incorrect but Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.