- 1(current)
Q. No.The life cycle of Ectocarpus, Polysiphonia and kelps is:
1.Diplontic
2.Haplontic
3.Aplantic
4.Haplo-diplontic
Subtopic: Â Life Cycle Patterns in Plants (OLD NCERT) |
 82%
From NCERT
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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 |
Subtopic: Â Life Cycle Patterns in Plants (OLD NCERT) |
From NCERT
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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.
Subtopic: Â Life Cycle Patterns in Plants (OLD NCERT) |
 75%
From NCERT
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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
Subtopic: Â Life Cycle Patterns in Plants (OLD NCERT) |
 89%
From NCERT
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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 |
Subtopic: Â Life Cycle Patterns in Plants (OLD NCERT) |
 80%
From NCERT
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- 1(current)
Q. No.
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