Prepare for NEET Biology Sexual Reproduction in Flowering Plants with MCQs & PYQs on NEET.GUIDE. Enjoy free practice, previous year questions, and expert solutions for pollination and fertilization.
NEET Questions / Botany / Sexual Reproduction in Flowering Plants
A researcher observes a plant species where the generative cell undergoes mitosis before pollination, resulting in two sperm cells within the pollen grain. How might this unusual characteristic affect double fertilization?
Prevent double fertilization from occurring.
Enhance the efficiency of double fertilization.
Potentially lead to the fertilization of both the egg cell and a synergid, disrupting endosperm development.
Have no significant impact on the process of double fertilization.
A unique feature of angiosperm fertilization is the formation of both a zygote and an endosperm nucleus. If a mutation occurred preventing the fusion of one of the male gametes with the polar nuclei, what would be the MOST likely direct consequence?
Endosperm would not develop, impacting seed viability.
The zygote would fail to form, preventing embryo development.
A triploid zygote would form instead of a diploid zygote.
The ovule would develop into a seedless fruit.
In a hypothetical plant species, the polar nuclei contain 2n chromosomes each, and the male gametes are n. What would be the ploidy of the endosperm and zygote, respectively, after double fertilization?
2n, n
3n, 2n
5n, 2n
n, 2n
Which of the following statements BEST explains why double fertilization is advantageous for angiosperms?
It ensures the formation of a triploid endosperm, which is more resistant to pathogens.
It allows for the production of both seeds and fruits, enhancing dispersal.
It synchronizes endosperm development with embryo development, preventing wasted resources if fertilization fails.
It eliminates the need for separate male and female gametophytes.
Certain apomictic plants produce seeds without fertilization. How would the genetic makeup of the endosperm in such a plant likely differ from a sexually reproducing angiosperm?
It would be genetically identical to the maternal tissue.
It would be a mixture of maternal and paternal genes.
It would be entirely paternal in origin.
It would be haploid.
A researcher discovers a new angiosperm species where the central cell contains four polar nuclei instead of the usual two. Assuming normal fertilization occurs, what would be the ploidy of the resulting endosperm?
3n
4n
5n
6n
Researchers are studying a mutant plant where the pollen tube fails to deliver the male gametes to the embryo sac. Which structure(s) would be ABSENT in the ovule of this mutant plant following pollination?
Zygote only
Endosperm only
Both zygote and endosperm
Neither zygote nor endosperm
What is the fate of the two male gametes discharged into the embryo sac during double fertilization?
Both fuse with the egg cell.
One fuses with the egg cell, and the other fuses with a synergid.
One fuses with the egg cell, and the other fuses with the central cell.
Both fuse with the central cell.
The product of syngamy in double fertilization is:
Endosperm
Zygote
Embryo Sac
Pollen Tube
What is the ploidy of the primary endosperm nucleus formed after double fertilization?
Haploid (n)
Diploid (2n)
Triploid (3n)
Tetraploid (4n)
