Q. No.Which of the following is not a correct difference between a grazing food chain [GFC] and a detritus food chain [DFC]?
|
|
GFC |
DFC |
|
1. |
Major conduit of energy flow in aquatic ecosystem |
Major conduit of energy flow in terrestrial ecosystem |
|
2. |
Much larger energy flows through it |
Much smaller energy flows through it |
|
3. |
Begins with producers |
Begins with dead organic matter |
|
4. |
Energy for this food chain comes from the sun |
Energy for this food chain comes from the remains of detritus |
| Assertion (A): | There is no limitation on the number of trophic levels in a detritus food chain. |
| Reason (R): | The transfer of energy between successive trophic levels in a detritus food chain does not follow the 10% rule. |
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. |
- 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
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| Assertion (A): | Most of an ecosystem’s production is eventually consumed by detritivores and decomposers. |
| Reason (R): | Energy is said to flow through, not cycle within, ecosystems. |
| 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. |
- 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
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :
|
(a) |
(b) |
(c) |
(d) |
|
|
1 |
Dog |
Squirrel |
Bat |
Deer |
|
2 |
Rat |
Dog |
Tortoise |
Crow |
|
3 |
Squirrel |
Cat |
Rat |
Pigeon |
|
4 |
Deer |
Rabbit |
Frog |
Rat |
The producers in aquatic ecosystems include all except:
| 1. | cyanobacteria | 2. | algae |
| 3. | plants | 4. | zooplankton |
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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 % |
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Primary producers near deep-sea vents are:
1. Chemohetrotrophic prokaryotes
2. Chemoauotrophic prokaryotes
3. Photosynthetic prokaryotes
4. Photosynthetic autotrophs
| Assertion (A): | Most food chains or webs have only about four or five trophic levels. |
| Reason (R): | Trophic efficiencies are generally only about 10% in different ecosystems. |
| 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. |
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| Assertion (A): | Carnivores generally have higher assimilation efficiencies than herbivores. |
| Reason (R): | Carnivores generally consume more food than herbivores. |
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. |
- 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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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