Q. No.In which one of the following pollination is autogamous?
(1) Xenogamy
(2) Chasmogamy
(3) Cleistogamy
(4) Geitonogamy
Transfer of pollen grains from the anther to the stigmaof another flower of the same plant is called
(1) xenogamy
(2) geitonogamy
(3) karyogamy
(4) autogamy
Wind pollinated flowers are
| 1. | small, brightly coloured, producing large number of pollen grains |
| 2. | small, producing large number of dry pollen grains |
| 3. | large, producing abundant nectar and pollen |
| 4. | small, producing nectar and dry pollen |
Endosperm is consumed by developing embryo in the seed of
(1) coconut
(2) castor
(3) pea
(4) maize
Unisexuality of flowers prevents
(1) autogamy, but not geitonogamy
(2) Both geitonogamy and xenogamy
(3) geitonogamy, but not xenogammy
(4) autogamy and geitonogamy
What does the filiform apparatus do at the entrance into ovule?
1. It helps in the entry of pollen tube into a synergid
2. It prevents entry of more than one pollen tube into the embryo sac
3. It brings about opening of the pollen tube
4. It guides pollen tube from a synergid to egg
Which one of the following is resistant to enzyme action?
(1) Cork
(2) Wood fibre
(3) Pollen exine
(4) Leaf cuticle
Male gametes in angiosperms are formed by the division of:
(1) microspore
(2) generative cell
(3) vegetative cell
(4) microspore mother cell
Parthenocarpic tomato fruits can be produced by :
(1) removing androecium of flowers before pollen grains are released
(2) treating the plants with low concentrations of gibberellic acid and auxins
(3) raising the plants from vernalized seeds
(4) treating the plants with phenylmercuric acetate.
Long filamentous threads protruding at the end of a young cob of maize are :
| 1. | anthers | 2. | styles |
| 3. | ovaries | 4. | hairs |
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