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Q. No.Triploid primary endosperm nucleus is formed when
1.
Syngamy occurs during double fertilization.
2.
Male gamete fuses with only one polar nuclei located in central cell
3.
Male gamete fuses with two polar nuclei located in central cell
4.
Male gamete fuses with two polar nuclei located in antipodal cells
Subtopic: Double Fertilization |
88%
From NCERT
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Cells of tapetum generally have more than one nucleus. This condition in the cells is developed due to
| 1. | Plasmogamy not followed by karyogamy |
| 2. | Failure of cytoplasmic division after nuclear division |
| 3. | Failure of the separation of daughter chromosomes during cell division |
| 4. | Migration of nuclei in a cell from neighbouring cells |
Subtopic: Pistil: Ovule |
66%
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Select the incorrect statement regarding embryo-sacs in angiosperms.
1. They are highly reduced female gametophytes
2. Each have three-called egg apparatus
3. Each cell of an embryo-sac is diploid
4. Its formation is preceded by meiosis
1. They are highly reduced female gametophytes
2. Each have three-called egg apparatus
3. Each cell of an embryo-sac is diploid
4. Its formation is preceded by meiosis
Subtopic: Pistil: Ovule |
73%
From NCERT
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In flowering plants, microspores are
1. Male gametes
2. Pollen grains
3. Pollen mother cells
4. Generative grains
1. Male gametes
2. Pollen grains
3. Pollen mother cells
4. Generative grains
Subtopic: Stamen: Male Gametophyte |
64%
From NCERT
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Number of haploid nuclei formed by the smaller cell of the pollen grain is
1. Four
2. Three
3. Two
4. Seven
1. Four
2. Three
3. Two
4. Seven
Subtopic: Stamen: Microsporangium |
69%
From NCERT
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Select the incorrect statement regarding the viability periods of pollen grains.
| 1. | It depends upon the chromosome number of a species |
| 2. | In some cerials the viability is lost within 30 minutes |
| 3. | Viability of pollen grains can be increased by storing them at very low temperature |
| 4. | In some leguminous plants, pollen grains maintain viability for months' |
Subtopic: Stamen: Male Gametophyte |
80%
From NCERT
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Read the following statements and select the correct option w.r.t angiosperms for blanks A, B and C.
I. The body of ovule with funicle in the region called A .
II. Female gametophyte is also called B .
III. C plays an important role in guiding the pollen tube into synergids.
I. The body of ovule with funicle in the region called A .
II. Female gametophyte is also called B .
III. C plays an important role in guiding the pollen tube into synergids.
| A | B | C | |
| 1. | Hilum | Embryo | Antipodal cell |
| 2. | Nucellus | Ovary | Polar nuclei |
| 3. | Micropyle | Ovary | Filiform apparatus |
| 4. | Hilum | Embryo sac | Filiform apparatus |
Subtopic: Pistil: Ovule | Seed |
86%
From NCERT
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In pollen banks, pollen grains are stored in
1. Dry ice
2. Normal room temperature
3. Liquid nitrogen
4. Absolute alcohol
1. Dry ice
2. Normal room temperature
3. Liquid nitrogen
4. Absolute alcohol
Subtopic: Stamen: Male Gametophyte |
97%
From NCERT
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Identify the figure and select the correct option for the labellings A, B, C and D.
| A | B | C | D | |
| 1. | Coleorhiza | Shoot apex | Epiblast | Radicle |
| 2. | Scutellum | Coleoptile | Shoot apex | Coleorhiza |
| 3. | Coleoptile | Cotyledon | Epiblast | Radicle |
| 4. | Scutellum | Coleoptile | Epiblast | Coleorhiza |
Subtopic: Embryo |
71%
From NCERT
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In papaver
(a) Each pistil has many ovaries
(b) Gynoecium has many carples.
(c) Pistils are fused together
(d) Each pistil has its own stigma.
1. (a), (c) and (d)carpels
2. (c) only
3. (b) and (c) only
4. (b), (c) and (d)
(a) Each pistil has many ovaries
(b) Gynoecium has many carples.
(c) Pistils are fused together
(d) Each pistil has its own stigma.
1. (a), (c) and (d)carpels
2. (c) only
3. (b) and (c) only
4. (b), (c) and (d)
Subtopic: Pistil: Female Gametophyte |
From NCERT
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