Q. No.
The rate of formation of new organic matter by consumers is called as:
1. Secondary productivity
2. Standing crop
3. Standing state
4. Net primary productivity
The limitations of ecological pyramids include all the following except:
1. The do not take into account the same species belonging to two or more trophic levels
2. They do not represent relationships between organisms at different trophic levels
3. They assume a simple food chain and do not consider food webs
4. Saprotrophs are not given any place in the ecological pyramids
About what percent of the global carbon is contained in the atmosphere?
1. 71
2. 49
3. 17
4. about 1
During the stages of succession in a given ecosystem the following changes in characteristics may be observed:
Characteristic Stages in ecosystem development
Early Late
A. Total matter Low High
B. Species diversity Low High
C. Size of organism Small Large
D. Productivity Low High
E. Food chains Short Long
Which one of the characteristics, A, B, C, D or E is responsible for the apparent high degree of stability associated with a climax ecosystem?
(1) B
(2) D
(3) A
(4) E
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
Which of the following is the functional unit of nature?
a. A plant
b. An animal
c. Ecosystem
d. Environment
Which of the following is not a man-made ecosystem?
a. Pond
b. Crop-field
c. Swimming pool
d. Both ‘a’ and ‘c’
Vertical distribution of different species occupying different levels is called as-
a. Vertification
b. Stratification
c. Succession
d. Layering
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