Q. No.An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
1. cuticle
2. sporopollenin
3. lignin
4. cellulose
Even in absence of pollinating agents seed-setting is assured in
(1) Commellina
(2) Zostera
(3) Salvia
(4) fig
The coconut water and the edible part of coconut are equivalent to
(1) endosperm
(2) endocarp
(3) mesocarp
(4) embryo
Nucellar polyembryony is reported in species of
(1) Gossypium
(2) Triticum
(3) Brassica
(4) Citrus
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
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