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Q. No.An anatropous ovule attaches to the placenta by means of:
1.
Funicle
2.
Raphe
3.
Hilum
4.
Integuments
Subtopic: Pistil: Ovule |
82%
Level 1: 80%+
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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. |
Subtopic: Pistil: Female Gametophyte |
59%
Level 3: 35%-60%
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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
1. Antipodals
2. Filiform apparatus in synergids
3. The egg cell
4. Polar nuclei
Subtopic: Pollen - Pistil Interaction |
95%
Level 1: 80%+
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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 |
Subtopic: Pollination & Outbreeding Devices |
84%
Level 1: 80%+
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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 |
Subtopic: Double Fertilization |
92%
Level 1: 80%+
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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
Subtopic: Double Fertilization |
68%
Level 2: 60%+
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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 |
Subtopic: Embryo |
88%
Level 1: 80%+
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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
1. The process is more dependable
2. Better adaptive strategies for dispersal
3. Protection of the young embryo
4. Genetic uniformity
Subtopic: Seed |
62%
Level 2: 60%+
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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
Subtopic: Apomixis & Polyembryony |
84%
Level 1: 80%+
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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 |
Subtopic: Apomixis & Polyembryony |
Level 3: 35%-60%
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