- 1(current)
Q. No.Consider the following four statements (a-d) and select the correct option stating which ones are true (T) or false (F)
| a. | Organisms at each trophic level depends on those at higher trophic level for their energy demands. |
| b. | Each trophic level has a certain mass of living material at a particular time called standing crop. |
| c. | Each trophic level has a certain mass of non-living material at a particular time called standing state. |
| d. | The number of trophic levels in a grazing food chain is not restricted. |
Options
| a | b | c | d | |
| 1. | T | T | F | F |
| 2. | F | T | F | T |
| 3. | T | F | T | F |
| 4. | F | T | T | F |
Subtopic: Energy Flow |
66%
From NCERT
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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. i and ii
2. ii and iii
3. iii and iv
4. i and iv
Subtopic: Energy Flow |
91%
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Hints
Match the columns:
1. A = (i), B = (ii), C = (iii), D = (iv)
2. A = (iv), B = (ii), C = (i), D = (iii)
3. A = (ii), B = (i), C = (iv), D = (iii)
4. A = (iv), B = (ii), C = (iii), D = (i)
| Column-I | Column-II | ||
| A. | Tansley | (i) | Gave the term ecology |
| B. | Ramdeo Mishra | (ii) | Father of ecology |
| C. | Reiter | (iii) | Correctly defined ecology |
| D. | Ernst Haeckel | (iv) | Gave the term ecosystem |
1. A = (i), B = (ii), C = (iii), D = (iv)
2. A = (iv), B = (ii), C = (i), D = (iii)
3. A = (ii), B = (i), C = (iv), D = (iii)
4. A = (iv), B = (ii), C = (iii), D = (i)
Subtopic: Energy Flow | Ecological Flow |
From NCERT
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Hints
Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| COLUMN I | COLUMN II | ||
| A | Standing crop | P | Mass of living material at each trophic level at a particular time |
| B | Standing state | Q | The amount of nutrients present in the soil at any given time |
| C | Net primary productivity | R | The rate of formation of new organic matter by consumers |
| D | Secondary productivity | S | Available biomass for the consumption to heterotrophs |
| A | B | C | D | |
| 1. | S | P | Q | R |
| 2. | P | Q | R | S |
| 3. | P | Q | S | R |
| 4. | R | P | Q | S |
Subtopic: Ecosystem Productivity | Energy Flow |
80%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Assertion: In a food chain, members of successive higher levels are fewer in number.
Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.
1. Both Assertion & Reason are true and Reason is the correct explanation of Assertion
2. Both Assertion & Reason are true but Reason is not the correct explanation of Assertion
3. Assertion is true statement but Reason is false.
4. Both Assertion and Reason are false statements.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Energy Flow | Ecological Flow |
73%
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A:
Energy flow in ecosystem is bidirectional.
R: Energy goes on increasing with each and every trophic level.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Energy goes on increasing with each and every trophic level.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Energy Flow | Ecological Pyramids |
91%
From NCERT
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Given below are two statements.
Statement I: Energy flow is greatly reduced at each successive trophic level from producers to herbivores and then carnivores.
Statement II: The pyramid of energy is both top right and inverted.
In light of the above statements, choose the most appropriate answer from the options given below.
1. Both statement I and statement II are true
2. Both statement I and statement II are false
3. Statement I is correct but statement II is false
4. Statement I is incorrect but statement II is true
Statement I: Energy flow is greatly reduced at each successive trophic level from producers to herbivores and then carnivores.
Statement II: The pyramid of energy is both top right and inverted.
In light of the above statements, choose the most appropriate answer from the options given below.
1. Both statement I and statement II are true
2. Both statement I and statement II are false
3. Statement I is correct but statement II is false
4. Statement I is incorrect but statement II is true
Subtopic: Energy Flow |
86%
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Hints
Choose the correct statements
A. Length of the food chain is generally limited to 3-4 trophic levels due to energy loss.
B. Length of food chain depends upon the producer
C. In hydrarch succession, lichen is the pioneer community
D. Removal of most of the carnivores in an ecosystem results in an increased population of deer
E. Removal of 80% of top carnivores results in greatly increased growth of vegetation
Choose the correct answer from the options given below
1. A, B and C only
2. C, D and E only
3. A, D and E only
4. A, B and D only
A. Length of the food chain is generally limited to 3-4 trophic levels due to energy loss.
B. Length of food chain depends upon the producer
C. In hydrarch succession, lichen is the pioneer community
D. Removal of most of the carnivores in an ecosystem results in an increased population of deer
E. Removal of 80% of top carnivores results in greatly increased growth of vegetation
Choose the correct answer from the options given below
1. A, B and C only
2. C, D and E only
3. A, D and E only
4. A, B and D only
Subtopic: Energy Flow | Ecological Pyramids |
66%
From NCERT
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Given below are two statements
In light of the above statements, choose the most appropriate answer from the options given below
1. Both statement I and statement II are correct
2. Both statement I and statement II are incorrect
3. Statement I is correct but statement II is incorrect
4. Statement I is incorrect but statement II is correct
| Statement I: | The pyramid of energy is always upright, can never be inverted |
| Statement II: | When energy flows from one trophic level to next trophic level, some energy is always lost as heat |
In light of the above statements, choose the most appropriate answer from the options given below
1. Both statement I and statement II are correct
2. Both statement I and statement II are incorrect
3. Statement I is correct but statement II is incorrect
4. Statement I is incorrect but statement II is correct
Subtopic: Energy Flow |
92%
From NCERT
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Assertion(A): The organisms which depend on producers for nutritional requirements are called primary consumers and are also called heterotrophs.
Reason(R): All animals depend on plants directly for their food needs.
Choices for Assertions and reasons:
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.
Reason(R): All animals depend on plants directly for their food needs.
Choices for Assertions and reasons:
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: Energy Flow |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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- 1(current)
Q. No.
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