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
Nucellus and antipodal cells
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.
What does the filiform apparatus do at the entrance into ovule?
It helps in the entry of pollen tube into a synergid
It prevents entry of more than one pollen tube into the embryo sac
It brings about opening of the pollen tube
It brings about opening of the pollen tube
Importance of day length in flowering of plants was first shown in
Lemna
tobacco
Cotton
Cotton
Unisexuality of flowers prevents
autogamy, but not geitonogamy
Both geitonogamy and xenogamy
geitonogamy, but not xenogamy
geitonogamy, but not xenogamy
Male gametes in angiosperms are formed by the division of
microspore
generative cell
vegetative cell
vegetative cell
