Q. No.Encystation during unfavorable conditions followed by multiple fission and sporulation when favorable conditions return is seen in:
1.
Sponges
2.
Penicillium
3.
Amoeba
4.
Hydra
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The ability to produce adventitious buds is exploited by gardeners for commercial propagation of:
| 1. | Bryophyllum | 2. | Agave |
| 3. | Water hyacinth | 4. | Ginger |
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Consider the two statements:
| I: | Eichhornia crassipes, the ‘terror of Bengal’ is an invasive weed. |
| II: | It was introduced in India for its beautiful flower and shape of leaves. |
| 1. | Both I and II are correct and II explains I. |
| 2. | Both I and II are correct but II does not explain I. |
| 3. | I is correct but II is incorrect. |
| 4. | I is incorrect but II is correct. |
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With the advent of adverse conditions, an organism capable of reproducing both asexually and sexually, will most likely:
| 1. | shift to asexual mode of reproduction |
| 2. | shift to sexual mode of reproduction |
| 3. | equally reproduce by both modes |
| 4. | die |
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| I: | Life spans of organisms are not necessarily correlated with their sizes. |
| II: | There is no natural death in single-celled organisms. |
| III. | Reproduction enables the continuity of the species, generation after generation |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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| Statement I: | When offspring is produced by a single parent but always with the involvement of gamete formation, reproduction is asexual. |
| Statement II: | When two parents [opposite sex] participate in the reproductive process and also involve the fusion of male and female gametes, it is called sexual reproduction. |
| 1. | Statement I is correct, Statement II is incorrect. |
| 2. | Statement I is correct, Statement II is correct. |
| 3. | Statement I is incorrect, Statement II is correct. |
| 4. | Statement I is incorrect, Statement II is incorrect. |
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| Assertion (A): | The term clone can be used to describe the progeny of asexual reproduction. |
| Reason (R): | The progeny of asexual reproduction are morphologically and genetically similar individuals. |
| 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. |
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| I: | The nucleus does not divide at all and the bud does not have genetic material. |
| II: | The division is unequal and small buds are produced that remain attached initially to the parent cell which, eventually get separated and mature into new yeast organisms. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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| I. | (a) shows aplanospores in Chlamydomonas |
| II. | (b) shows exogenous basidia in smut fungus |
| III. | (c) shows budding in Hydra |
| IV. | (d) shows gemmules in sponge |
| 1. | Only I and II | 2. | Only II and III |
| 3. | Only II and IV | 4. | Only I and III |
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| COLUMN I | COLUMN II | ||
| A |  |
P | Bulbil |
| B |  |
Q | Rhizome |
| C |  |
R | Offset |
| D |  |
S | Adventitious buds |
Codes:
| A | B | C | D | |
| 1. | Q | P | S | R |
| 2. | P | Q | R | S |
| 3. | P | Q | S | R |
| 4. | Q | P | R | S |
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