Q. No.During microsporogenesis, meiosis occurs in:
1. Endothecium
2. Microspore in mother cell
3. Microspore tetrads
4. Pollen grains.
1. are large in size and always white in colour
2. secrete foul odours to attract these animals
3. produce winged pollens
4. are invariably pollinated by abiotic agents as well
(i) Pollen release and stigma receptivity are not synchronised.
(ii) Different positions of anther and stigma.
(iii) Production of different types of pollen grains.
(iv) Formation of unisexual flowers along with bisexual flowers.
(v) Preventing self-pollen from fertilising the ovules by inhibiting pollen germination.
1. (i), (ii) and (v)
2. (ii), (iii) and (v)
3. (i), (iii) and (v)
4. (iii), (iv) and (v)
1. Both are angiosperms.
2. Both are gymnosperm.
3. Both are chasmogamous flowers.
4. Both (1) and (3)
1. egg cell
2. embryo
3. embryo sac
4. all of the above will be formed
Which of the following statements is correct with respect to parthenocarpic fruit?
(1) They develop from the thalamus
(2) They can be formed by the application of growth hormones
(3) These fruits bear seeds
(4) Can be exemplified by strawberry and cashew
. Given below is a figure of an embryo. Select the correct option with respect to it
(1) The embryo possess two cotyledons
(2) Label ‘A’ is called as coleoptile
(3) Label ‘C’ encloses radicle and root cap
(4) Label ‘B’ is called scutellum
In some members of which of the following pairs of families, pollen grains retain their viability for months after release?
1. Poaceae; Solanaceae
2. Rosaceae; Leguminosae
3. Poaceae; Rosaceae
4. Poaceae; Leguminosae
A typical angiosperm embryo sac at maturity is:
1. 7-nucleate and 7-celled
2. 8-nucleate and 8-celled
3. 8-nucleate and 7-celled
4. 7-nucleate and 8-celled
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination, brings genetically different types of pollen grains to stigma, is:
| 1. | Chasmogamy | 2. | Cleistogamy |
| 3. | Xenogamy | 4. | Geitonogamy |
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