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Sexual Reproduction In Flowering Plants

Question
CBSEENBI12002660
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Which one of the flowing pairs of plants structures has haploid number of chromosomes?

  • Megaspore mother cell and antipodal cells

  • Egg cell and antipodal cells

  • Nucellus and antipodal cells

  • Egg nucleus and secondary nucleus

Solution

B.

Egg cell and antipodal cells

In angiosperms, a single diploid megaspore mother cell matures within the ovule. Through meiosis, it gives rise to four megaspores (haploid). In most plant, only one of these megaspore divides three times by mitosis and produces eight haploid nuclei enclosed with a 7 celled embryo sac. One nucleus is located near the opening of embryo space in the middle of embryo sac and is called polar nuclei, two nuclei are contained in cells called antipodals, located at the end of the embryo sac, opposite the egg cell.
Nucellus is centrally located mass of thin-walled parenchymatous cells covered by integuments in ovule.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

The innermost layer of anther is tapetum whose function is :

In a bisexual flower when the gynaecium matures earlier than anther, it is called as :

Simultaneous meiotic division of microspore mother cells leads to :

The fertilization occurs in the :

The female gametophyte of a typical dicot at the time of fertilization is:

Development of embryo  from any cell of nucellus is called :

Parthenocarpic fruit is :

The entry of pollen tube into embryo sac through the integuments is termed as :

512 microspores will be formed following meiosis of how many microspore mother cells.

Pollination by water occurs in :

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