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.
Differentiate between integument and testa.
Name the hormones influencing the follicular development of corpus luteum.
Filiform apparatus is found in ______.
Embryo sac is called monosporic when it develops from ______.
Embryo sac is found in ______.
Megaspore mother cell ______.
Development of an organism from female gamete/egg without involving fertilization is ______.
Eight nucleate embryo sacs are ______.
Through which cell of the embryo sac, does the pollen tube enter the embryo sac?
Which of the following occupies a central position in flower?
Embryo sac → Nucellus → Integuments, is the correct sequence of parts in the ovule of an angiosperms.
During megasporogenesis, potential megaspore mother cell undergoes following cell divisions to form gametophyte female ______
Apomictic embryos in Citrus arise from: ______
Filiform apparatus is a highly thickened structure commonly present in ______.
Megaspores are produced from the megaspore mother cells after ______.
Identify the type of carpel with the help of diagrams given below:
