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NEET Questions / Botany / Sexual Reproduction in Flowering Plants
In angiosperms, after the pollen tube enters the synergid, what is the function of the two male gametes?
Syngamy and triple fusion
Formation of the embryo sac
Development of the pollen tube
Initiation of meiosis
Which statement correctly describes the fate of the male gametes discharged in the synergid?
One participates in syngamy, and the other participates in triple fusion.
Both participate in syngamy.
Both participate in triple fusion.
Both degenerate.
Double fertilization in angiosperms involves the fusion of the male gametes with which structures?
Egg cell and polar nuclei
Two egg cells
Two polar nuclei sets
Synergids and antipodals
If one male gamete fuses with the egg cell, what is the fate of the other male gamete in the process of double fertilization?
Fuses with the polar nuclei to form the primary endosperm nucleus
Fuses with another egg cell
Degenerates
Forms the seed coat
When does the extrusion of the second polar body from the egg nucleus typically occur?
Before ovulation
After sperm entry
During the formation of the primary oocyte
Before the first meiotic division
In human reproduction, the secondary oocyte completes meiosis II upon the entry of the sperm. What event marks this completion?
Formation of the first polar body
Extrusion of the second polar body
Completion of meiosis I
Ovulation
Which of the following events occurs immediately after sperm penetration into the secondary oocyte?
Formation of the zygote
Extrusion of the second polar body and completion of meiosis II
Beginning of meiosis I
Ovulation
If the second polar body is not extruded, what stage of oogenesis is likely incomplete?
Meiosis I
Meiosis II
Oogonia formation
Ovulation
The extrusion of the second polar body is essential for:
(i) Completion of meiosis II
(ii) Maintaining the correct chromosome number in the zygote
(iii) Allowing sperm penetration
(i) only
(i) and (ii)
(ii) and (iii)
(i), (ii), and (iii)
Which of the following processes leads to seed development in flowering plants without the fusion of gametes?
Fragmentation
Apomixis
Double fertilization
Parthenogenesis
