Match the items in Column-I with those in Column-II :
Column I Column II
(a) Herbivores-Plants (i) Commensalism
(b) Mycorrhiza-Plants (ii) Mutualism
(c) Sheep-Cattle (iii) Predation
(d) Orchid-Tree (iv) Competition
Select the correct option from following :
(1) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
(2) (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
(3) (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
(4) (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
The impact of immigration on population density is :-
(1) Negative
(2) Both positive and negative
(3) Neutralized by natality
(4) Positive
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 the 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 |
According to Alexander von Humboldt :
(1) Species richness decreases with increasing area of exploration
(2) Species richness increases with the increasing area, but only up to limit
(3) There is no relationship between species richness and area explored.
(4) Species richness goes on increasing with increasing area of exploration
In the following, in each set, a conservation approach and an example of a method of conservation are given
| (a) | In situ conservation - Biosphere Reserve |
| (b) | Ex situ conservation - Sacred groves |
| (c) | In situ conservation - Seed bank |
| (d) | Ex situ conservation - Cryopreservation ` |
Select the option with the correct match of approach and method :
| 1. | (a) and (c) | 2. | (a) and (d) |
| 3. | (b) and (d) | 4. | (a) and (b) |
A species which was introduced for ornamentation but has become a troublesome weed in India :
(1) Parthenium hysterophorus
(2) Eichhornia crassipes
(3) Prosopis juliflora
(4) Trapa Spinosa
Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants
(1) Vehicular exhaust
(2) Allergy causing pollen
(3) Noise
(4) Particulates of size 2.5 micrometer or below
According to the Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health?
(1) 3.5 micrometers
(2) 2.5 micrometers
(3) 4.0 micrometers
(4) 3.0 micrometers
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