- 1(current)
Q. No.There is no natural death in single-celled organisms like Amoeba and bacteria because:
1. They cannot reproduce sexually
2. They reproduce by binary fission
3. Parental body is distributed among the offspring
4. They are microscopic
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The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because:
| 1. | Offspring do not possess exact copies of parental DNA |
| 2. | DNA of only one parent is copied and passed on to the offspring |
| 3. | Offspring are formed at different times |
| 4. | DNA of the parent and offspring are completely different. |
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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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Match the asexual reproductive structure in COLUMN I with organisms in COLUMN II and select the correct option from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A. |
Zoospore |
a. |
Penicillium |
|
B. |
Conidia |
b. |
Chlamydomonas |
|
C. |
Buds |
c. |
Sponge |
|
D. |
Gemmule |
d. |
Hydra |
| Options: | (A) | (B) | (C) | (D) |
| 1. | a | b | c | d |
| 2. | d | c | b | a |
| 3. | c | d | a | b |
| 4. | b | a | d | c |
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Match vegetative propagules in COLUMN I with plants in COLUMN II and select the correct option from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A. |
Rhizome |
a. |
Bryophyllum |
|
B. |
Bulbil |
b. |
Eichhornia |
|
C. |
Leaf buds |
c. |
Ginger |
|
D. |
Offset |
d. |
Agave |
| Options: | (A) | (B) | (C) | (D) |
| 1. | a | b | c | d |
| 2. | d | c | b | a |
| 3. | c | d | a | b |
| 4. | b | a | d | c |
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In the given diagrams each part A, B, C and D shows a reproductive structure in an organism marked as ‘X’. Select the option where all parts are correctly matched:
|
A. |
 |
B. |  |
|
B. |
 |
D. |  |
| 1. | A: Oogonium of Chara; B: Archegoniophore of Marchantia; C: Conidia of Penicillium; D: Offset of Eicchornia |
| 2. | A: Antheridium of Chara; B: Antheridiophore of Marchantia; C: Sporangiophores of Penicillium; D: Offset of Eicchornia |
| 3. | A: Oogonium of Chara; B: Antheridiophore of Marchantia; C: Conidia of Penicillium; D: Offset of Eicchornia |
| 4. | A: Antheridium of Chara; B: Archegoniophore of Marchantia; C: Conidia of Penicillium; D: Stolon of Eicchornia |
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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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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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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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In several simple plants like algae, bryophytes, and pteridophytes, water is the medium through which gamete transfer takes place. To increase the chances of fertilization, such plants:
| 1. | Produce a large number of female gametes that are non-motile |
| 2. | Produce a large number of male gametes that is several thousand times the number of female gametes produced |
| 3. | Produce a large number of female gametes that is several thousand times the number of male gametes produced |
| 4. | Do not have the capability of reproducing asexually |
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- 1(current)
Q. No.
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