Winged pollen grains are present in from Biology Sexual Reproduc

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 Multiple Choice QuestionsMultiple Choice Questions

71.

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

  • –120°C

  • –80°C

  • –160°C

  • –196°C


72.

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

  • Pollenkitt

  • Cellulosic intine

  • Sporopollenin

  • Oil content


73.

Offsets are produced by

  • Meiotic divisions

  • Mitotic divisions

  • Parthenogenesis

  • Parthenocarpy


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74.

Winged pollen grains are present in

  • Mustard

  • Cycas

  • Pinus

  • Mango


C.

Pinus

In Pinus, winged pollen grains are present. It is extended outer exine on two lateral sides to form the wings of pollen. It is the characteristic feature, only in Pinus. Pollen grains of Mustard, Cycas & Mango are not winged shaped.


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75.

With respect to angiosperms, identify the incorrect pair from the following

  • antipodal - 2n

  • Vegetative all of male gametophyte - n

  • Primary endosperm nucleus-3n

  • Cell of nucellus of ovule -2n


76.

Which one of the following statements is correct?

  • Hard outer of pollen is called intine

  • Sporogenous tissue is haploid

  • ENdothelium produces the microspores

  • Tapetum nourishes the developing pollen


77.

Endosperm of gymnosperms is

  • Haploid

  • Tetraploid

  • Diploid

  • None of these


78.

When pollen tube enters through micropyle, the process is called

  • Porogamy

  • Chalazogamy

  • Mesogarny

  • Apogamy


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79.

Outer wall of pollen grain is made up of

  • Cellulose

  • Sporopollenin

  • Pectocellulose

  • Lignin


80.

Which of the following floral parts forms pericarp after fertilization?

  • Nucellus

  • Outer integument

  • Ovary wall

  • Inner integument


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