Q. No.Tapetum:
1.
is the outermost layer in the wall of microsporangium
2.
helps in the protection of the pollen grains
3.
helps in dehiscence of anther
4.
has cells that generally have more than one nucleus
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What guides the entry of the pollen tube though the micropyle into the embryo sac in the angiosperms?
| 1. | Antipodals | 2. | Filiform apparatus in synergids |
| 3. | The egg cell | 4. | Polar nuclei |
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Double fertilization, a characteristic of angiosperms, results in the formation of:
| 1. | diploid zygote due to syngamy and triploid primary endosperm cell due to triple fusion |
| 2. | triploid zygote due to triple fusion and diploid primary endosperm cell due to syngamy |
| 3. | diploid zygote due to syngamy and haploid primary endosperm cell as it is formed pre-fertilization |
| 4. | diploid zygote due to syngamy and diploid primary endosperm cell due to triple fusion |
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Scutellum is:
| 1. | the cotyledon in seeds of the grass family |
| 2. | globular embryo of a dicot |
| 3. | persistent nucellus in a seed |
| 4. | undifferentiated sheath enclosing root cap in monocot seeds |
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Seeds offer several advantages to angiosperms. Which of the following is not one?
| 1. | The process is more dependable |
| 2. | Better adaptive strategies for dispersal |
| 3. | Protection of the young embryo |
| 4. | Genetic uniformity |
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Apomixis is:
| I: | production of seeds without fertilization |
| II: | production of fruits without fertilization |
| III: | a form of asexual reproduction that mimics sexual reproduction |
1. Only I and II are correct
2. Only I is correct
3. Only III is correct
4. Only I and III are correct
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What is the advantage of converting hybrids into apomicts for farmers?
| 1. | Can be easily produced year after year |
| 2. | Segregation of traits creates more diversity |
| 3. | A great reduction in cost |
| 4. | Overcoming inbreeding depression |
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After pollination and fertilization, the ovule and the ovary, respectively, become:
| 1. | embryo and seed | 2. | seed and fruit |
| 3. | stigma and style | 4. | zygote and endosperm |
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The number of cycles of mitotic cell divisions the megaspore goes through, before the embryo sac is fully formed is:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
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The correct description of the structure shown in the figure would be:
| 1. | Anatropous ovule; 1 – Nucellus; 2 – Chalaza; 3 – Raphe; 4 – Funiculus |
| 2. | Orthotropous ovule; 1 – Nucellus; 2 – Micropyle; 3 – Raphe; 4 – Funiculus |
| 3. | Anatropous ovule; 1 – Nucellus; 2 – Chalaza; 3 – Funiculus; 4 – Raphe |
| 4. | Anatropous ovule; 1 – Nucellus; 2 – Micropyle; 3 – Raphe; 4 – Funiculus |
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