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NEET Questions / Botany / Sexual Reproduction in Flowering Plants
A flower exhibiting cleistogamy, but with viable pollen grains, fails to produce seeds. Which of the following is the LEAST likely explanation for this observation?
Lack of pollinating agents
Failure of pollen tube growth
Non-functional stigma
Problems with fertilization
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.
Imagine a plant species where the pollen tube enters the embryo sac through the chalaza instead of the micropyle (chalazogamy). Which of the following would be the LEAST affected by this unusual entry pathway?
The path of pollen tube growth within the style.
The interaction between the pollen tube and the synergids.
The genetic makeup of the sperm cells.
The timing of pollen tube discharge into the embryo sac.
Which combination of reproductive processes would result in the highest degree of genetic uniformity within a plant population?
Apomixis and self-fertilization
Apomixis and cross-fertilization
Sexual reproduction and self-fertilization
Sexual reproduction and cross-fertilization
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.
If insect populations declined significantly, what would be the most likely impact on the reproduction of water hyacinth and water lily?
Increased seed production
No change in seed production
Decreased seed production
Shift to self-pollination
If the second polar body is not extruded, what stage of oogenesis is likely incomplete?
Meiosis I
Meiosis II
Oogonia formation
Ovulation
A botanist observes a new plant species with flowers containing a single ovule per ovary, clustered in an inflorescence. Considering these characteristics, which pollination vector is LEAST likely?
Wind
Insects
Water
Birds
Which reproductive strategy produces genetically identical offspring to the maternal parent through seed production without fertilization?
Self-pollination
Cross-pollination
Apomixis
Vegetative propagation
