Which of the following is not a producer?

1.Spirogyra2.Agaricus
3.Volvox4.Nostoc

Subtopic:  Energy Flow |
 69%
From NCERT
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Which of the following ecosystems is most productive in terms of net primary production? 

1.Deserts2.Tropical rainforests
3.Oceans4.Estuaries

Subtopic:  Ecosystem Productivity |
 84%
From NCERT
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Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis? 

1.Less than 1%2.2-10 %
3.30 %4.50 %

Subtopic:  Energy Flow |
 65%
From NCERT
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How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores? 

1.1%2.10%
3.40%4.90%

Subtopic:  Energy Flow |
 71%
From NCERT
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Among the following bio-geo-chemical cycles, which one does not have losses due to respiration? 
1. Phosphorus
2. Nitrogen
3. Sulphur
4. All of the above

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 69%
From NCERT
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The sequence of communities of primary succession in water is :

1.  Phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses, and trees.
2.  Phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses, and trees.
3.  Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses, and trees.
4.  Phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow, and trees.

Subtopic:  Ecological Succession (OLD NCERT) |
 67%
From NCERT
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Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm?
1. Grassland
2. Shrubby forest
3. Desert
4. Mangrove

Subtopic:  Components & Types of Ecosystems |
 74%
From NCERT
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The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called?

1.Pelagic zone2.Benthic zone
3.Lentic zone4.Littoral zone

Subtopic:  Components & Types of Ecosystems |
From NCERT
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Which of the following is an ecosystem service provided by a natural ecosystem? 

1.  Cycling of nutrients
2.  Prevention of soil erosion
3.  Pollutant absorption and reduction of the threat of global warming
4.  All of the above

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 89%
From NCERT
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Various adaptations have evolved in plants that can increase their uptake of nutrients.
Reason (R):  Plants are unable to ‘choose’ their environment as they are unable to move about.
In the light of the above statements, choose the most appropriate answer from the options given below :
1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Components & Types of Ecosystems |
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