Q. No.The second stage of hydrosere is occupied by plants like :
1. Azolla
2.Typha
3.Salix
4. Vallisneria
1. Azolla
2.Typha
3.Salix
4. Vallisneria
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Secondary productivity is rate of formation of new organic matter by:
1. Parasite
2. Consumer
3. Decomposer
4. Producer
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If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
plant → mice → snake → peacock
1. 0.02 J
2. 0.002 J
3. 0.2 J
4. 0.0002 J
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Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.
Options :
|
A |
B |
C |
D |
|
|
1. |
Rock minerals |
Detritus |
Litter fall |
Producers |
|
2. |
Litter |
Producers |
Rock minerals |
Detritus |
|
3. |
Detritus |
Rock minerals |
Producer |
Litter fall |
|
4. |
Producers |
Litter fall |
Rock minerals |
Detritus |
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Match the following and select the correct option :
(a) Earthworm (i) Pioneer species
(b) Succession (ii) Detrivore
(c) Ecosystem service (iii) Natality
(d) Population growth (iv) Pollination
a b c d
1. (i) (ii) (iii) (iv)
2. (iv) (i) (iii) (ii)
3. (iii) (ii) (iv) (i)
4. (ii) (i) (iv) (iii)
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Vertical distribution of different species occupying different levels in a biotic community is known as:
1. Stratification
2. Zonation
3. Pyramid
4. Divergence
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The mass of living material at a trophic level at a particular time is called:
1. Standing state
2. Net primary productivity
3. Standing crop
4. Gross primary productivity
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In an ecosystem the rate of production of organic matter during photosynthesis is termed as :
1. Gross primary productivity
2. Secondary productivity
3. Net productivity
4. Net primary productivity
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Secondary Succession takes place on/in :
1. Degraded forest
2. Newly created pond
3. Newly cooled lava
4. Bare rock
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