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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
In a particular angiosperm species, the synergids exhibit a unique filiform apparatus oriented away from the micropyle. What would be the MOST likely consequence of this unusual arrangement?
Enhanced pollen tube attraction
Faster pollen tube growth
Reduced fertilization success
Increased seed production
A mutation affects the tapetum in a developing anther, leading to premature degeneration of this tissue. What is the MOST likely direct consequence of this mutation?
Increased production of viable pollen grains.
Enhanced pollen germination rates.
Defective pollen wall formation and reduced pollen viability.
Accelerated development of the microspore mother cells.
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.
Which of the following combinations of floral characteristics would MOST effectively promote cross-pollination?
Monoecy, self-compatibility, and homogamy
Dioecy, self-incompatibility, and protandry
Cleistogamy, self-compatibility, and protogyny
Hermaphroditism, self-compatibility, and synchronized pollen and stigma maturity
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.
A unique feature of angiosperm embryogenesis is the formation of a suspensor. Which statement regarding the suspensor is INCORRECT?
It connects the developing embryo to the maternal tissues.
It provides a conduit for nutrients and growth regulators.
It pushes the embryo into the endosperm.
It undergoes extensive cell divisions to form the embryo proper.
In a rare genetic mutation in a dicot plant, the formation of the hypophysis is inhibited. What would be the MOST likely direct consequence of this mutation?
Failure of endosperm development
Impaired radicle development
Absence of cotyledons
Delayed fruit ripening
Which of the following accurately describes the difference between the development of the nuclear endosperm and the cellular endosperm?
Nuclear endosperm is formed after fertilization, while cellular endosperm is formed before fertilization.
Nuclear endosperm is triploid, while cellular endosperm is diploid.
Nuclear endosperm is found in monocots, while cellular endosperm is found in dicots.
Nuclear endosperm involves free-nuclear divisions before cell wall formation, while cellular endosperm involves cell wall formation after each division.
In some plants, the integuments develop into a hard seed coat. What is the primary function of this hardened structure?
Nutrient storage for the embryo
Facilitation of seed dispersal
Promotion of germination
Protection of the embryo
