12th Standard CBSE - Biology - Sexual Reproduction in Flowering Plants

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Question - 1

Egg apparatus consists of

  • A egg
  • B egg and polar nuclei
  • C Egg and synergids
  • D Egg and antipodal cells

Question - 2

Intraspecific incompatability can be overcome by

  • A Wetting of anthers
  • B Mixed pollination
  • C Intraovarian fertilization
  • D Intraspecific competition

Question - 3

Which type of association is found in between entomophilous flower and pollinating agent?

  • A Mutualism
  • B Commensalism
  • C Cooperation
  • D Coevolution

Question - 4

In angiosperms, pollen tubes liberate their male gametes into the

  • A Central cell
  • B Antipodal cell
  • C Egg cell
  • D Synergids

Question - 5

Insect-pollinated flowers are characterized by

  • A Large number of pollens
  • B Dry and smooth pollens
  • C Sticky and rough pollens
  • D Heavy pollens

Question - 6

In a flowering plant, archesporium gives rise to

  • A only the wall of the sporangium
  • B both wall and the sporogenous cells
  • C wall and the tapetum
  • D Only tapetum and sporogenous cells

Question - 7

Pick the odd one out

  • A Chalazogamy
  • B Porogamy
  • C Mesogamy
  • D Allogamy

Question - 8

The plant part which consists of two generations one within the other, is

  • A Germinated pollen grain
  • B seed
  • C Unfertilized ovule
  • D Embryo

Question - 9

Pollen grains are able to withstand extremes of temperature and desiccation because their exile is composed of

  • A Cutin
  • B Suberin
  • C Sporopollenin
  • D Callose

Question - 10

Devices for self-pollination are

  • A Dicliny or unisexuality
  • B Dichogamy
  • C heterostyly
  • D None of these