- 1(current)
Q. No.Consider the given statements regarding patterns of life cycle in living organisms:
I. In haplontic life cycles, zygotes are the only diploid cells; mitosis occurs only in the diploid phase.
II. In diplontic life cycles, gametes are usually the only haploid cells, and mitosis usually occurs only in the haploid phase.
III. In haplo-diplontic life cycle, alternation of generations is marked and mitosis occurs in both haploid and diploid phases.
| 1. Only III is correct | 2. Both I and II are correct |
| 3. All are correct | 4. All are incorrect |
53%
Level 3: 35%-60%
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The given figure represents the life cycle of a typical:
| 1. | Gymnosperm | 2. | Angiosperm |
| 3. | Bryophyte | 4. | Pteridophyte |
Level 3: 35%-60%
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The life cycle of Ectocarpus, Polysiphonia and kelps is:
1.Diplontic
2.Haplontic
3.Aplantic
4.Haplo-diplontic
77%
Level 2: 60%+
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The given pattern of life cycle will be seen in:
| 1. Spirogyra | 2. Fucus |
| 3. Ectocarpus | 4. Polysiphonia |
59%
Level 3: 35%-60%
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The given pattern of life cycle will be seen in:
| 1. Spirogyra | 2. Fucus |
| 3. Ectocarpus | 4. Polysiphonia |
60%
Level 2: 60%+
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The given pattern of life cycle will be seen in:
| 1. Spirogyra | 2. Fucus |
| 3. Chlamydomanas | 4. Polysiphonia |
63%
Level 2: 60%+
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In Haplontic life cycle:
| I. | Sporophytic generation is represented only by the one-celled zygote. |
| II. | Meiosis in zygote results in the formation of haploid gametes. |
| III. | The dominant photosynthetic stage is the free living gametophyte |
| 1. | Only I is correct |
| 2. | Only I and III are correct |
| 3. | Only II is correct |
| 4. | I, II and III are correct |
Level 3: 35%-60%
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Regarding plants exhibiting diplontic life cycle:
1. Gametophyte is the dominant photosynthetically independent phase.
2. The sporophytic stage is represented by the single to few-celled diploid sporophyte.
3. All seed bearing plants follow this pattern with some variations.
4. Most algae follow this type of life cycle.
1. Gametophyte is the dominant photosynthetically independent phase.
2. The sporophytic stage is represented by the single to few-celled diploid sporophyte.
3. All seed bearing plants follow this pattern with some variations.
4. Most algae follow this type of life cycle.
69%
Level 2: 60%+
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The type of life cycle followed by:
I. Spirogyra is haplontic
II. Fucus is diplontic
III. Ectocarpus, Polysiphonia and kelps is haplo-diplontic
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
I. Spirogyra is haplontic
II. Fucus is diplontic
III. Ectocarpus, Polysiphonia and kelps is haplo-diplontic
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
83%
Level 1: 80%+
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A plant has a dominant, independent, photosynthetic, thalloid or erect phase as a haploid gametophyte which alternates with the short-lived, multicellular sporophyte totally or partially dependent on the gametophyte for its anchorage and nutrition. This plant most likely belongs to:
| 1. Red algae | 2. Bryophytes |
| 3. Pteridophytes | 4. Gymnosperms |
77%
Level 2: 60%+
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- 1(current)
Q. No.
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