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Q. No.Select the correct statements regarding dissolved Oxygen and Biochemical Oxygen demand.
A:
BOD is inversely related to dissolved oxygen
B:
Low dissolved oxygen and high BOD lead to loss of aquatic life.
C:
High BOD leads to high dissolved oxygen
D:
Both BOD and dissolved oxygen are indicator of health of a water body
E:
Both BOD and dissolved oxygen are affected by amount of organic matter in the water body.
Choose the most appropriate answer from the options given below:
1.
(A), (B), (C), (E) only
2.
(A), (B), (D), (E) only
3.
(A), (B), (C), (D) only
4.
(B), (C), (D), (E) only
Subtopic: Water Pollution |
73%
From NCERT
NEET - 2023
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What effect will be observed if sewage in untreated condition is disposed off in freshwater body?
| 1. | BOD and dissolved oxygen will increase. |
| 2. | BOD and dissolved oxygen will decrease. |
| 3. | BOD will increase but dissolved oxygen will decrease. |
| 4. | BOD will decrease but dissolved oxygen will increase. |
Subtopic: Water Pollution |
74%
From NCERT
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Given below are two statements:
| Assertion (A): | Noise is stressing for human beings. |
| Reason (R): | Chronic exposure to a relatively lower noise level of cities may permanently damage the hearing abilities of humans. |
| 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. |
Subtopic: Air Pollution |
From NCERT
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Given below are two statements:
| Assertion (A): | As the water flows through the marshes of . · Arcata, it gets purified naturally. |
| Reason (R): | Only fungi and bacteria were seeded into 7. this area, which neutralise, absorb and assimilates the pollutants. |
| 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. |
Subtopic: Water Pollution |
53%
From NCERT
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Given below are two statements:
| Assertion (A): | During recycling of e-waste in countries like India, China and Pakistan workers are_ 8. exposed to toxic substances present in e-waste. |
| Reason (R): | Over half of e-wastes generated in the developed world are exported to developing countries. |
| 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. |
Subtopic: Solid Waste Pollution |
65%
From NCERT
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Given below are two statements:
| Assertion (A): | Problems due to use of chemical fertilisers in agriculture are extremely grave. |
| Reason (R): | Agrochemicals can't be toxic to non-target organisms that are important components of the soil ecosystem |
| 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. |
Subtopic: Agrochemical & Radioactive Waste |
56%
From NCERT
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Given below are two statements:
| Assertion (A): | Greenhouse effect heats up earth's surface |
| Reason (R): | Half of incoming solar radiations as well as heat energy released by gases like CO2 and methane cause increase in temperature of earth's surface. |
| 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. |
Subtopic: Green House Effect & Global Warming |
70%
From NCERT
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Given below are two statements:
| Assertion (A): | There is increase in melting of Himalayan snow caps and polar ice caps. |
| Reason (R): | Rise in temperature is leading to s1,Jch deleterious changes in the environment. |
| 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. |
Subtopic: Green House Effect & Global Warming |
72%
From NCERT
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Given below are two statements:
| Assertion (A): | Forest can be conserved in a sustainable manner. |
| Reason (R): | Forest purifies air and makes it useful to animals. |
| 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. |
Subtopic: Deforestation |
57%
From NCERT
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Given below are two statements:
| Assertion (A): | Depletion of ozone is particularly marked over the Antartic region. |
| Reason (R): | Ozone depletion is occurring widely in the stratosphere due to pollutants like CFCs. |
| 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. |
Subtopic: Ozone Layer Depletion |
60%
From NCERT
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