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Q. No.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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Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
61%
From NCERT
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The mass of cells in megasporangium of a flower that have abundant materials is
1. Integument
2. Haploid tissue of female parent
3. Diploid tissue of parent
4. Hilum
1. Integument
2. Haploid tissue of female parent
3. Diploid tissue of parent
4. Hilum
Subtopic: Pistil: Female Gametophyte |
59%
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Read the following statements and state them true (T) or False (F)
| A. | Continued cross pollination of plants results in inbreeding depression. |
| B. | In members of Poaceae, the single cotyledon is called scutellum. |
| C. | Apple is a false fruit because it is developed only from the ovary. |
| A | B | C | |
| 1. | T | T | F |
| 2. | T | F | T |
| 3. | F | F | T |
| 4. | F | T | F |
Subtopic: Pollination & Outbreeding Devices |
72%
From NCERT
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In majority of flowering plants, embryo sac formation is monosporic. it means
| 1. | A single megaspore mother cell is involved in the formation of embryo sac |
| 2. | A single megaspore is involved in the formation of embryo sac |
| 3. | Each embryo sac has only one female gamete |
| 4. | Each megaspore mother cell is modified to form a single megaspore |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
63%
From NCERT
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Central cell of a typical embryo sac
1. Is not surrounded by cell wall
2. Is situated above the egg apparatus
3. Has two polar nuclei
4. Forms the cotyledon of the embryo
1. Is not surrounded by cell wall
2. Is situated above the egg apparatus
3. Has two polar nuclei
4. Forms the cotyledon of the embryo
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
83%
From NCERT
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