An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

(1) cuticle

(2) sporopollenin

(3) lignin

(4) cellulose

Subtopic:  Stamen: Male Gametophyte |
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Even in absence of pollinating agents seed-setting is assured in

(1) Commellina

(2) Zostera

(3) Salvia

(4) fig

Subtopic:  Pollination & Outbreeding Devices |
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The coconut water and the edible part of coconut are equivalent to

(1) endosperm

(2) endocarp

(3) mesocarp

(4) embryo

Subtopic:  Endosperm |
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Wind pollination is common in

(1) lilies

(2) grasses

(3) orchids

(4) legumes

Subtopic:  Pollination & Outbreeding Devices |
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Nucellar polyembryony is reported in species of

(1) Gossypium

(2) Triticum

(3) Brassica

(4) Citrus

Subtopic:  Apomixis & Polyembryony |
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In which one of the following pollination is autogamous?

(1) Xenogamy

(2) Chasmogamy

(3) Cleistogamy

(4) Geitonogamy

Subtopic:  Pollination & Outbreeding Devices |
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Apomictic embryos in Citrus arise from

(1) synergids

(2) maternal sporophytic tissue in ovule

(3) antipodal cells

(4) diploid egg

Subtopic:  Apomixis & Polyembryony |
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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

Subtopic:  Pollination & Outbreeding Devices |
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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

Subtopic:  Pollination & Outbreeding Devices |
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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

Subtopic:  Pistil: Female Gametophyte |
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