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Q. No.
Assertion (A):
An example of microbial biocontrol agents that can be introduced in order to control butterfly caterpillars is the bacteria Bacillus thuringiensis (often written as Bt).
Reason (R):
The development of methods of genetic engineering has helped scientists to introduce B. thuringiensis toxin genes into plants.
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: Microbes in Biocontrol Agent |
62%
Level 2: 60%+
Hints
Assertion(A): Organic farmers create a system where pests are eradicated within a living and vibrant ecosystem.
Reason(R): A key belief of the organic farmer is that biodiversity furthers health.
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): A key belief of the organic farmer is that biodiversity furthers health.
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: Microbes in Biocontrol Agent |
Level 3: 35%-60%
Hints
Assertion(A): The bottled juices are clarified by the use of pectinases and proteases.
Reason(R): The bottled fruit juices bought from the market are clearer as compared to those made at home.
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): The bottled fruit juices bought from the market are clearer as compared to those made at home.
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: Chemistry of Fermented Beverages |
56%
Level 3: 35%-60%
Hints
| Assertion (A): | Sewage is treated in sewage treatment plants (STPs) before disposal. |
| Reason (R): | This treatment makes sewage less polluting. |
| 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: Microbes in Sewage Treatment |
90%
Level 1: 80%+
Hints
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Assertion: Azolla pinnata is used as biofertilizer in rice cultivation.
Reason: Azolla performs nitrogen fixation with the help of symbiotic bacterium Bacillus.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Reason: Azolla performs nitrogen fixation with the help of symbiotic bacterium Bacillus.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Subtopic: Microbes as Biofertilizer |
51%
Level 3: 35%-60%
Hints
| Assertion (A): | Most of the orchid species seedlings cannot proceed with development in the absence of symbiotic fungi. |
| Reason (R): | Lichens contain symbiotically associated fungi. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A) |
| 3. | (A) is true, (R) is false |
| 4. | (A) is false, (R) is true |
Subtopic: Microbes in Biocontrol Agent |
53%
Level 3: 35%-60%
Hints
| Assertion (A): | Biofertilizers are preferred over chemical fertilizers. |
| Reason (R): | Chemical fertilizers are more hazardous to the environment. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Microbes as Biofertilizer |
90%
Level 1: 80%+
Hints
| Assertion (A): | While working on Staphylocci, Alexander Fleming observed that Penicillium notatum inhibits the growth of the bacteria. |
| Reason (R): | This inhibiting chemical was commercially extracted and its full potential was established by Alexander Fleming. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A) |
| 3. | (A) is True, (R) is false |
| 4. | (A) is false, (R) is True |
Subtopic: Microbes in Household Products |
75%
Level 2: 60%+
Hints
Assertion: Yeast such as Saccharomyces cerevisiae are used in baking industry.
Reason: Carbon dioxide produced during fermentation causes bread dough to rise by thermal expansion.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Reason: Carbon dioxide produced during fermentation causes bread dough to rise by thermal expansion.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Subtopic: Microbes in Production of Biogas |
Level 3: 35%-60%
Hints
Read the following statements:
Which of the above statements are correct?
1. (i) and (iii)
2. (ii), (iii) and (iv)
3. (ii) and (v)
4. (ii) and (iv)
| (i) | Trichoderma is a symbiotic algae which is common in root ecosystems and effective against several plant pathogens |
| (ii) | Dragonflies are biocontrol agents |
| (iii) | Bacillus thuringiensis spores are mixed in alcohol and sprayed to vulnerable plants like brassicas and fruit trees |
| (iv) | Baculoviruses attack arthropods and other insects |
| (v) | Nucleopolyhedrovirus (NPV) have species-specific, broad spectrum insecticidal applications |
1. (i) and (iii)
2. (ii), (iii) and (iv)
3. (ii) and (v)
4. (ii) and (iv)
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
60%
Level 2: 60%+
Hints
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