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 of the following statements is incorrect?
1. | Biomass decreases from first to fourth trophic level. |
2. | Energy content gradually increases from first to fourth trophic level. |
3. | Number of individuals decreases from first trophic level to fourth trophic level. |
4. | Energy content gradually decreases from first to fourth trophic level. |
In the equation GPP – R = NPP, R represents:
1. Environment factor
2. Respiration losses
3. Radiant energy
4. Retardation factor
Which of the following statements is not correct?
1. | Pyramid of energy is always upright. |
2. | Pyramid of numbers in a grassland ecosystem is upright. |
3. | Pyramid of biomass in sea is generally inverted. |
4. | Pyramid of biomass in sea is generally upright. |
Match the trophic levels with their correct species examples in the green land ecosystem
Column I | Column II | ||
(a) | Fourth trophic level | (i) | Cow |
(b) | Second trophic level | (ii) | Vulture |
(c) | First trophic level | (iii) | Rabbit |
(d) | Third trophic level | (iv) | Grass |
Select the correct option:
Options: | (a) | (b) | (c) | (d) |
1. | (iii) | (ii) | (i) | (iv) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (i) | (ii) | (iii) | (iv) |
4. | (ii) | (iii) | (iv) | (i) |
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
1. | Gross primary productivity is always more than Net primary productivity. |
2. | Gross primary productivity and Net primary productivity are one and the same. |
3. | There is no relationship between Gross primary productivity and Net primary productivity. |
4. | Gross primary productivity is always less than net primary productivity. |
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 |