Prepare for NEET Biology Sexual Reproduction in Flowering Plants (Pre Fertilization Structure And Events) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert solutions to examine pollen development, stigma, and pollination.
NEET Questions / Botany / Sexual Reproduction in Flowering Plants / Pre Fertilization Structure And Events
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.
The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called:
Megasporogenesis
Microsporogenesis
Sporogenesis
Gametogenesis
Which of the following is NOT a characteristic of a mature pollen grain?
It has a hard outer exine layer
It contains a generative cell and a vegetative cell
It is always binucleate
It is the male gametophyte
The ovule attached to the placenta by means of a stalk called:
Hilum
Micropyle
Chalaza
Funicle
What is the function of the tapetum in the anther?
Protection of the anther
Production of pollen grains
Nourishment of developing pollen grains
Dehiscence of the anther
