What is PAR range?

(1) 200 nm - 800 nm          

(2) 400 nm - 700 nm

(3) 350 nm - 550 nm         

(4) 600 nm - 100 nm

Subtopic:  Energy Flow |
 83%
AIIMS - 2007
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The bacteria which attack dead animals are 
(1) first link of the food chain and are known as primary producers.

(2) Second link of the food chain and are herbivorous

(3) third link of the food chain and are tertiary consumers

(4) the end of food chain and are decomposers.

Subtopic:  Decomposition |
 83%
AIIMS - 2008
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Animals take phosphorous from 
(1) water 

(2) plants

(3) rock 

(4) soil.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
From NCERT
AIIMS - 2010
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Most animals that live in deep oceanic waters are

(1) Tertiary consumers

(2) Detritivores

(3) Primary consumers

(4) Secondary consumers

Subtopic:  Decomposition |
 68%
AIIMS - 2016
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Keystone species deserve protection because these

(1) are capable of surviving in harsh environmental conditions

(2) indicate presence of certain minerals in the soil

(3) have become rare due to overexploitation

(4) play an important role in supporting other species.

Subtopic:  Ecological Succession (OLD NCERT) |
 74%
AIIMS - 2017
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Energy flow in an ecosystem is 

(1) unidirectional

(2) bidirectional

(3) multi-directional

(4) All the these 

Subtopic:  Energy Flow |
 93%
From NCERT
AIIMS - 2012
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In a stable ecosystem, which of the following limits the number of trophic levels?

(1) Biomass

(2) The number of nutrients

(3) Availability of nutrients

(4) Presence of contaminants that increase in concentration along the food chain

Subtopic:  Energy Flow |
 53%
AIIMS - 2010
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Most of the world's carbon is found:

1. As carbon dioxide in the atmosphere.

2. In living organisms.

3. As bicarbonate and carbonate ions dissolved in the oceans.

4. As carbonate minerals in sedimentary rock.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 76%
From NCERT
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Photosynthesis and respiration are central to which cycle?
1. The nitrogen cycle 

2. The carbon cycle

3. The phosphorus cycle

4. The sulfur cycle

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 88%
From NCERT
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The phosphorus cycle differs from the carbon cycle in that:
a. Phosphorus does not enter living organisms, whereas carbon does.
b. The phosphorus cycle does not include a gaseous phase, whereas the carbon cycle does.
c. The phosphorus cycle includes a solid phase, whereas the carbon cycle does not
d. The primary reservoir of the phosphorus cycle is the atmosphere, whereas the primary reservoir for the carbon cycle is in rock.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 78%
From NCERT
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