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Sexual Reproduction in flowering Plants

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Wind pollinated flowers are

  • small, brightly coloured, producing large number of pollen grains

  • small, producing large number of dry pollen grains

  • large, producing abundant nectar and pollen

  • small, producing nectar and dry pollen


B.

small, producing large number of dry pollen grains

Pollination taking place by means of wind is known as anemophily, eg, Zea mays, Cannabis Pinus, etc. Some features of wind-pollinated flowers are - 
i) Non -essential Whorls such as calyx, corolla and bracts, bracteoles are not showy.
ii) The perianth lobes are undeveloped or reduced and sometimes absent.
iii) Flowers are devoid of scent and nectars. 
iv) Plants produce a very large quantity of dusty pollen grains.
v) Pollen grains are dry, very small sized, non-sticky and unwettable

These features are helpful for the individuality of pollen grains.

Pollination taking place by means of wind is known as anemophily, eg, Zea mays, Cannabis Pinus, etc. Some features of wind-pollinated flowers are - 
i) Non -essential Whorls such as calyx, corolla and bracts, bracteoles are not showy.
ii) The perianth lobes are undeveloped or reduced and sometimes absent.
iii) Flowers are devoid of scent and nectars. 
iv) Plants produce a very large quantity of dusty pollen grains.
v) Pollen grains are dry, very small sized, non-sticky and unwettable

These features are helpful for the individuality of pollen grains.

386 Views

In a bisexual flower when the gynaecium matures earlier than anther, it is called as :
  • protandry
  • protogyny
  • herkogyny
  • None of the above.

B.

protogyny
1265 Views

Simultaneous meiotic division of microspore mother cells leads to :
  • tetrahedral tetrad
  • linear tetrad
  •  isobilateral
  • decussate tetrad.

A.

tetrahedral tetrad
1487 Views

The female gametophyte of a typical dicot at the time of fertilization is:
  •  8-celled
  • 7-celled
  • 6-celled
  • 4-celled

B.

7-celled
2359 Views

The innermost layer of anther is tapetum whose function is :
  • dehiscence
  • mechanical
  • nutrition
  •  protection.

C.

nutrition
1827 Views

The fertilization occurs in the :
  • ovary
  • ovule
  • embryo sac
  • nucellus.

A.

ovary
1446 Views