Q. No.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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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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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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An anatropous ovule attaches to the placenta by means of:
| 1. | Funicle | 2. | Raphe |
| 3. | Hilum | 4. | Integuments |
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Regarding the mature monosporic female gametophyte of angiosperms:
| 1. | The egg apparatus is at the chalazal end and the antipodals at the micropylar end. |
| 2. | The central cell has a diploid polar nucleus. |
| 3. | The structure is 8-celled and 7-nucleate. |
| 4. | Three sequential mitotic divisions lead to its formation. |
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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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During artificial hybridization in plant breeding experiments, if the female parent produces unisexual flowers:
| 1. | Emasculation should be done before the dehiscence of the anther |
| 2. | Emasculation should be done after the dehiscence of the anther |
| 3. | Emasculation is not needed |
| 4. | They cannot be used in plant breeding experiments |
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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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Which of the given statement/s regarding embryogenesis in angiosperms is/are correct?
| I: | Embryo develops at the chalazal end of the embryo sac where the zygote is situated. |
| II: | Development of a zygote usually occurs after some endosperm formation. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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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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