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 Multiple Choice QuestionsMultiple Choice Questions

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221.

Which of the following has proved helpful in preserving pollen as fossils?

  • Pollenkitt

  • Cellulosic intine

  • Sporopollenin

  • Oil content


222.

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

  • –120°C

  • –80°C

  • –160°C

  • –196°C


223.

Winged pollen grains are present in

  • Mustard

  • Cycas

  • Pinus

  • Mango


224.

After double fertilisation, a mature ovule has

  • I diploid and I haploid cell

  • 1 diploid and I triploid cell

  • 2 haploid and I triploid cell

  • 1 haploid and I triploid cell


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225.

Offsets are produced by

  • Meiotic divisions

  • Mitotic divisions

  • Parthenogenesis

  • Parthenocarpy


226.

Double fertilization is

  • Fusion of two male gametes of a pollen tube with two different eggs

  • Fusion of one male gamete with two polar nuclei

  • Syngamy and triple fusion

  • Fusion of two male gametes with one egg


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