Q. No.Subtopic: Double Fertilization |
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Which of the following statements accurately describes the process of double fertilization in angiosperms and its significance?
| 1. | Double fertilization results in two identical zygotes, providing redundancy and ensuring seed development even if one fails. |
| 2. | In double fertilization, both sperm cells fuse with the egg cell, enhancing genetic diversity in the resulting seed. |
| 3. | The two fertilization events form twin embryos that develop independently within the same seed coat. |
| 4. | One sperm fertilizes the egg cell to form a diploid zygote, while the other fuses with two polar nuclei to form a triploid endosperm, which nourishes the developing embryo. |
Subtopic: Double Fertilization |
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Match the events/processes in plant reproduction (List-I) with their descriptions (List-II):
Options:
| List-I (Process) |
List-II (Description) |
||
| A. | Microsporogenesis | I. | Formation of microspores from microspore mother cell |
| B. | Megasporogenesis | II. | Formation of functional megaspore from MMC |
| C. | Syngamy | III. | Fusion of male gamete with egg |
| D. | Triple fusion | IV. | Fusion of male gamete with central cell nuclei |
| 1. | A-I, B-II, C-III, D-IV | 2. | A-II, B-I, C-IV, D-III |
| 3. | A-I, B-III, C-II, D-IV | 4. | A-IV, B-II, C-I, D-III |
Subtopic: Stamen: Microsporangium | Pistil: Ovule | Pistil: Female Gametophyte | Double Fertilization |
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Which one of the following generates new genetic combinations leading to variations?
1. vegetative reproduction
2. parthenogenesis
3. Sexual reproduction
4. Nucellar polyembryony
Subtopic: Double Fertilization |
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Which structures of a seed are formed in flowering plants after syngamy and triple fusion respectively?
1. Endosperm and cotyledons
2. Embryo and endosperm
3. Cotyledons and testa
4. Embryo and seed coat
Subtopic: Double Fertilization |
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What is the fate of the male gametes discharged in the synergid?
| 1. | One fuses with the egg and the other fuses with central cell nuclei |
| 2. | One fuses with the egg and other(s) degenerate(s) in the synergid |
| 3. | All fuse with the egg |
| 4. | One fuses with the egg and other(s) fuse(s) with the synergid nucleus |
Subtopic: Double Fertilization |
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Level 1: 80%+
NEET - 2019
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The cells of the endosperm are filled with reserve food materials and are used for the nutrition of developing embryo is generally a ______ in angiosperms.
1. Triploid tissue
2. Diploid tissue
3. Haploid tissue
4. Hexaploid tissue
1. Triploid tissue
2. Diploid tissue
3. Haploid tissue
4. Hexaploid tissue
Subtopic: Double Fertilization | Endosperm |
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The nutritive tissue in the seeds of flowering plants that is formed from the union of a sperm cell and two polar nuclei is called the
1. plumule
2. endosperm
3. cotyledon
4. hypocotyl
1. plumule
2. endosperm
3. cotyledon
4. hypocotyl
Subtopic: Double Fertilization | Endosperm |
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Which of the following correctly describes the role of the primary endosperm nucleus (PEN) in flowering plants?
| 1. | It fuses with the zygote to form the embryo. |
| 2. | It provides genetic material for embryo formation. |
| 3. | It gives rise to the triploid endosperm that nourishes the developing embryo. |
| 4. | It protects the embryo from desiccation during seed development. |
Subtopic: Double Fertilization | Endosperm |
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Consider the following statements:
| Statement A: | The primary endosperm nucleus (PEN) is formed by the fusion of one male gamete with two polar nuclei. |
| Statement B: | The endosperm provides nutrition to the developing embryo and in some plants persists in mature seeds. |
| 1. | Statement A is correct but Statement B is incorrect |
| 2. | Both Statement A and Statement B are incorrect |
| 3. | Statement A is incorrect but Statement B is correct |
| 4. | Both Statement A and Statement B are correct |
Subtopic: Double Fertilization | Endosperm |
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