Q. No.Perturbation of which of the following cycles contributes most to global warming?
(1) The global carbon cycle
(2) The global water cycle
(3) The global nitrogen cycle
(4) All of these cycles contribute equally
Some of the stages in the hydrarch are labelled as:
A. Marsh meadow stage
B. Reed swamp stage
C. Submerged plant stage
D. Phytoplankton stage
E. Submerged free floating plant stage
Identify the choice that represents the correct sequence of these stages:
(1) D, C, E, B and A
(2) C, E, A, B and D
(3) B, D, C, A and E
(4) D, E, C, B and A
Read the following statements carefully.
(i) Primary succession is a very slow process taking thousands of years for the climax to reach.
(ii) Energy at a higher trophic level is always more than that at a lower level.
(iii) Bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called fragmentation.
(iv) All succession, whether taking place in water or on land, proceeds to a similar climax community - the mesic.
Which of the two above statements are correct?
1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iv)
4. (iii) and (iv)
The removal of 'Keystone' species will affect:
(1) The producers
(2) The consumers
(3) The ecosystem
(4) The decomposers
Which of the following is the functional unit of nature?
1. A plant
2. An animal
3. Ecosystem
4. Environment
Which of the following is not a man-made ecosystem?
1. Pond
2. Crop-field
3. Swimming pool
4. Both ‘1’ and ‘3’
Which vertical strata is occupied by trees in a forest?
1. Top
2. Middle
3. Bottom
4. Any of the above.
Which of the following could affect the rate of function of a pond?
1. The solar input
2. The cycle of temperature
3. Day-length
4. All of the above
The basic requirement for any ecosystem to function and sustain is
1. Enormous amount of water
2. Constant input of solar energy
3. Fertile soil
4. Oxygen
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