Advertisements
Advertisements
प्रश्न
What is meant by monosporic development of female gametophyte?
उत्तर
Out of the megaspore tetrad formed as a result of megasporogenesis, three get destroyed. And only one megaspore becomes active, which develops into a female gametophyte. The nucleus of the megaspore forms eight nuclei in three mitotic divisions. Four nuclei are arranged at each pole. Out of the four nuclei located at the micropylar pole of the embryo sac, three nuclear cells form the egg apparatus, whereas out of the four nuclei at the chalazal end, three nuclei form antipodal cells. One nucleus each from both poles combines in the central cell to form the polar nucleus. Since the female gametophyte develops from only one megaspore, it is called monosporic development.
APPEARS IN
संबंधित प्रश्न
Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it:
(i) that develops into seed coat.
(ii) that develops into an embryo after fertilization.
(iii) that develops into an endosperm in an albuminous seed.
(iv) through which the pollen tube gains entry into the embryo sac.
(v) that attaches the ovule to the placenta.
With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
Differentiate between integument and testa.
Where exactly is the filiform apparatus present in the embryo sac of an angiosperm? States its function.
Name the hormones influencing the follicular development of corpus luteum.
The point at which funiculus touches the ovule is ______.
The most common type of ovule is ______.
Functional megaspore in an angiosperm develops into ______.
Development of an organism from female gamete/egg without involving fertilization is ______.
Nucellus embryo is ______.
What is the direction of micropyle in anatropous ovule?
What is the function of filiform apparatus in an angiospermic embryo sac?
The part of gynoecium that determines the compatible nature of pollen is ______.
Part of the gynoecium which receives the pollen is called ______.
Growth of pollen tube towards embryo sac is ______.
During the process of fertilisation the pollen tube of the pollen grain usually enters the embryo sac through ______.
The hilum is a scar on the:
Function of filiform apparatus is to:
Name the parts of pistil which develop into fruit and seeds.
