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Q. No.| 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%
From NCERT
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| 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 |
89%
From NCERT
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| 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 |
73%
From NCERT
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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 |
From NCERT
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Read the following statements:
(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
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
Which of the above statements are correct?
1. (i) and (iii)
2. (ii), (iii) and (iv)
3. (ii) and (v)
4. (ii) and (iv)
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
59%
From NCERT
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Read the given statements and select the correct option:
| A - | Trichoderma is an effective biocontrol agent of several plant pathogens. |
| B - | B. thuringiensis is effective against larvae of bollworm. |
1. Both A and B are correct
2. Both A and B are incorrect
3. Only A is correct
4. Only B is correct
Subtopic: Microbes in Biocontrol Agent |
79%
From NCERT
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Consider the following statement (a-d) each with one or two blanks.
a. All solids that settle during primary treatment of sewage forms____(i)____ and supernatant forms the ____(ii)___.
b. Secondary treatment of sewage is also known as ___(iii)___ treatment.
c. A small part of the activated sludge is pumped back into the aeration tank to serve as the ___(iv)_____.
d. The sewage water is treated till ____(v)_____ is reduced.
Which of the following option given the correct fill ups for the respective blank numbers from (i) to (v) in the statements?
1. (i) Primary sludge (iii) Flocs (v) Do
2. (ii) Effluent (iii) Biological (iv) Inoculum (v) BOD
3. (i) Primary sludge (iii) Flocs ( iv) Inoculm (v) DO
4. (i) Effluent (ii) Primary sludge (iii) Flocs (v) BOD
Subtopic: Microbes in Sewage Treatment |
87%
From NCERT
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Consider the following statements:
| I: | Statins, used as blood cholesterol-lowering agents, are derived from Monascus purpureus |
| II: | Cyclosporin A, derived from Trichoderma, is used as an immunosuppressant |
| III: | Baculoviruses, in the genus Nucleopolyhederovirus, are species-specific, broad-spectrum insecticides |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
76%
From NCERT
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Match the columns:
1. A = (ii), B = (iv), C = (i), D = (iii)
2. A = (ii), B = (iv), C = (iii), D = (i)
3. A = (iii), B = (iv), C = (i), D = (ii)
4. A = (i), B = (ii), C = (iv), D = (iii)
| Column-I | Column-II | ||
| 1. | Rotenone | (i) | Chrysanthemum cinerarifolium |
| 2. | Nicotine | (ii) | Derris elliptica |
| 3. | Azadiractin | (iii) | Azadirachta indica |
| 4. | Pyrethrum and cinerin |
(iv) | Nicotiana tabacum |
1. A = (ii), B = (iv), C = (i), D = (iii)
2. A = (ii), B = (iv), C = (iii), D = (i)
3. A = (iii), B = (iv), C = (i), D = (ii)
4. A = (i), B = (ii), C = (iv), D = (iii)
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
80%
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Match the items in column "A' and coloum 'B' and choose the correct answer
| Column I | Column II |
| A. Lady bird | (i) Methano bacterium |
| B. Mycorrhiza | (ii) Trichoderma |
| C. Biological control | (iii) Aphids |
| D. Biogas | (iv) Glomus |
The correct answer is
| A | B | C | D | |
| (1) | ii | iv | iii | i |
| (2) | iii | iv | ii | i |
| (3) | iv | i | ii | iii |
| (4) | iii | ii | i | iv |
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules | Microbes in Production of Biogas | Microbes in Biocontrol Agent | Microbes as Biofertilizer |
92%
From NCERT
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