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
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 of the following plant structures exemplifies two generations embedded within each other?
Pollen grains inside the anther
Germinated pollen grain with two male gametes
Seed inside the fruit
Embryo sac inside the ovule
In which of the following plant structures does a haploid generation reside within a diploid generation?
Pollen grains inside the anther
Germinated pollen grain with two male gametes
Seed inside the fruit
Embryo sac inside the ovule
The female gametophyte of an angiosperm is located within which sporophytic structure?
Anther
Stigma
Fruit
Ovule
Which structure represents the gametophytic generation enclosed within the sporophytic generation in the ovule of a flowering plant?
Embryo sac
Nucellus
Integuments
Micropyle
Except for one, all the following structures in a flowering plant represent the sporophytic generation. Which one is the exception?
Anther
Embryo sac
Ovary wall
Ovule integuments
Cells of innermost layer of anther
Have a-cellulosic fibrous band
Do not degenerate
Nourish the developing pollen grains
Help in dehiscence of anther
Wind-pollinated flowers show all of the given characteristics, except
Pollen grains are light and non-sticky
Flowers have well-exposed stamens
Flowers have large feathery stigma
Pollen grains are generally surrounded by mucilaginous covering
