About 70% of total global carbon is found in

1. grasslands

2. agro-ecosystems

3. oceans

4. forests

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 83%
From NCERT
NEET - 2008
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The slow rate of decomposition of fallen logs in nature is due to their

1. low moisture content

2. poor nitrogen content

3. anaerobic environment around them

4. low cellulose content

Subtopic:  Decomposition |
NEET - 2008
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Consider the following statements concerning food chains

(i) Removal of 80% tigers from an area resulted in greatly increased growth of

vegetation

(ii) Removal of most of the carnivores resulted in an increased population of deers

(iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss

(iv) The length of food chains may vary from 2 to 8 trophic levels

Which two of the above statements are correct?

1. ii and iii

2. iii and iv

3. i and iv

4. i and ii

Subtopic:  Energy Flow |
 77%
NEET - 2008
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Quercus species are the dominant component in

1. temperate deciduous forests

2. alpine forests

3. scrub forests

4. tropical rain forests

NEET - 2008
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Which of the following ecosystem types has the highest annual net primary productivity ?

1. Tropical rain forest

2. Tropical deciduous forest

3. Temperate evergeen forest

4. Temperate deciduous forest

Subtopic:  Ecosystem Productivity |
 83%
NEET - 2007
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Which one of the following is not used for construction of ecological pyramids?

1. Dry weight

2. Number of individuals

3. Rate of energy flow

4. Fresh weight

Subtopic:  Ecological Pyramids |
 80%
From NCERT
NEET - 2006
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Photosynthesis is absent in 

1. aphotic layer                 

2. photic layer        

3. benthic layer                 

4. pelagic layer.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 70%
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The given type of ecological pyramid represents

 

1. pyramid of numbers in tree ecosystem

2. pyramid of biomass in a fallow land 

3. pyramid of biomass in a lake

4. energy pyramid in a spring

Subtopic:  Ecological Pyramids |
 64%
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Which of the following zones of a lake is habitat for snails, slugs and microorganisms?

1. Littoral

2. Limnetic

3. Benthic

4. Profundal

Subtopic:  Components & Types of Ecosystems |
 57%
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Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considered

as occupying

1. first trophic level

2. second trophic level

3. third trophic level

4. fourth trophic level.

Subtopic:  Energy Flow |
 53%
AIIMS - 2003
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