A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment, is called as:
1.A population2.A species
3.A biological community4.An ecosystem
Subtopic:  Introduction |
 88%
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Consider the given two statements:
I: Anthropogenic actions can have significant effect on natural ecosystems.
II: An aquarium is considered as a man made ecosystem.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Components & Types of Ecosystems |
 94%
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Physical structure of an ecosystem:
I: is same for all types of ecosystems.
II: is the result of interaction of biotic and abiotic components.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Introduction | ECOSYSTEM – STRUCTURE AND FUNCTION |
 66%
From NCERT
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Vertical distribution of different species occupying different levels in an ecosystem is called:
1. edge effect 2. ecotone
3. stratification 4. canopy structure
Subtopic:  Introduction |
 95%
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Energy flow and nutrient cycling are two important components of an ecosystem. What will be true comparison of the two?

1.  The amount of energy is much greater than the amount of nutrients
2.  Organisms always need nutrients, but they don't always need energy
3.  Nutrients are recycled, but energy is not
4.  Organisms always need energy, but they don't always need nutrients

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 73%
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Consider the given two statements:
Assertion (A): Temperature is the most important abiotic factor affecting living organisms.
Reason (R): Temperature affects enzyme kinetics.
 
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. (A) is False but (R) is True.
Subtopic:  Introduction |
 84%
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Of the given two statements:
I: A constant input of solar energy is the basic requirement for almost all ecosystems to function and sustain.
II: There is unidirectional movement of energy towards the higher trophic levels and its dissipation as heat to the environment.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Ecosystem Productivity | Energy Flow |
 95%
From NCERT
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Consider the given two statements:
I: Primary production of an ecosystem is expressed in terms of weight (gm–2) or energy (kcal m–2).
II: Productivity of an ecosystem is expressed in terms of gm–2 yr–1 or (kcal m–2) yr–1 .
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Ecosystem Productivity |
 88%
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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is:
1. Primary production
2. Primary productivity
3. Secondary production
4. Secondary productivity
Subtopic:  Ecosystem Productivity |
From NCERT
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Productivity is the rate of production of biomass expressed in terms of :
i. (kcal m-3) yr-1
ii. g m-2 yr-1
iii. g m-1 yr-1
iv. (kcal m-2) yr-1

 
1. ii 2. iii
3. ii and iv 4. i and iii

Subtopic:  Ecosystem Productivity |
 86%
From NCERT
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