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
Apomictic embryos in Citrus arise from
(1) synergids
(2) maternal sporophytic tissue in ovule
(3) antipodal cells
(4) diploid egg
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 |
Which one of the following pairs of plant strucutre has haploid number of chromosomes?
(1) Megaspore mother cell and antipodal cells
(2) Egg cell and antipodal cells
(3) Nucellus and antipodal cells
(4) Egg nucleus and secondary nucleus
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