Q. No.From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
1.
Monoecious plant bearing unisexual flowers
2.
Dioecious plant bearing only male or female flowers
3.
Monoecious plant with bisexual flowers
4.
Dioecious plant with bisexual flowers
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In a fertilised embryo sac, the haploid, diploid, and triploid structures are:
| 1. | Synergid, zygote, and primary endosperm nucleus |
| 2. | Synergid, antipodal and polar nuclei |
| 3. | Antipodal, synergid, and primary endosperm nucleus |
| 4. | Synergid, polar nuclei and zygote. |
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In an embryo sac, the cells that degenerate after fertilisation are:
1. Synergids and primary endosperm cell
2. Synergids and antipodals
3. Antipodals and primary endosperm cell
4. Egg and antipodals
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While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant?
1. Bagging of the female flower
2. Dusting of pollen on the stigma
3. Emasculation
4. Collection of pollen
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In the embryos of a typical dicot and a grass, true homologous structures are:
| 1. | Coleorhiza and coleoptile | 2. | Coleoptile and scutellum |
| 3. | Cotyledons and scutellum | 4. | Hypocotyl and radical |
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The phenomenon observed in some plants wherein parts of the sexual apparatus are used for forming embryos without fertilisation is called
| 1. | Parthenocarpy | 2. | Apomixis |
| 3. | Vegetative propagation | 4. | Sexual reproduction |
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In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be:
1. Haploid
2. Diploid
3. A few haploid and a few diploid
4. With varying ploidy
The phenomenon wherein, the ovary develops into a fruit without fertilisation is called:
| 1. | Parthenocarpy | 2. | Apomixis |
| 3. | Asexual reproduction | 4. | Sexual reproduction |
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A diploid female plant is crossed with a tetraploid male. The ploidy of endosperm will be:
| 1. | Tetraploidy | 2. | Pentaploidy |
| 3. | Triploidy | 4. | Diploidy |
In oogamy, fertilization occurs between
1. Small non-motile female gamete and large motile male gamete
2. Large non-motile female gamete and small motile male gamete
3. A large non-motile female gamete and a small non-motile male gamete
4. A large motile female gamete and a small non-motile male gamete
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