Q. No.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.
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) |
The sequence of communities succeeding each other during the course of succession represent the:
(1) Climax
(2) Sere
(3) Primary succession
(4) Secondary succession
The pioneer community in xerarch succession is formed by:
(1) Lichens and mosses
(2) Herbaceous plants
(3) Shrubs
(4) Trees
Identify the incorrect statement regarding ecological succession:
(1) Primary succession takes longer than secondary succession as it involves soil formation.
(2) As succession proceeds, the number and type of animals and decomposers change due to change in vegetational changes.
(3) Both hydrarch and xerarch successions proceed to a similar climax community – the mesic.
(4) While the pioneers in secodary hydrach succession are invariably phytoplanktons, lichens are pioneers in primary xerarch succession.
The pioneer community in hydrarch succession is formed by:
(1) Submerged aquatic plants
(2) Floating plants
(3) Emergent rooted plants
(4) Phytoplankton and zooplankton
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. |
Which of the following statements is incorrect regarding the phosphorus cycle?
| 1. | Phosphates are the major form of phosphorus reservoir. |
| 2. | Phosphorus solubilizing bacteria facilitate the release of phosphorus from organic remains. |
| 3. | There is an appreciable respiratory release of phosphorus into the atmosphere. |
| 4. | It is a sedimentary cycle. |
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 |
Identify the likely organisms (a), (b), (c), and (d) in the food web shown below:
|
(a) |
(b) |
(c) |
(d) |
|
|
1. |
Dog |
Squirrel |
Bat |
Deer |
|
2. |
Rat |
Dog |
Tortoise |
Crow |
|
3. |
Squirrel |
Cat |
Rat |
Pigeon |
|
4. |
Deer |
Rabbit |
Frog |
Rat |
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