CUET UG · Biology / Biological Studies (Domain)
Flower structure, microsporogenesis, megasporogenesis, double fertilisation, post-fertilisation events.
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Q1 · Sexual Reproduction in Flowering Plants · EASY
In a typical angiosperm flower, the male gametophyte at maturity consists of how many cells and how many nuclei?
Q2 · Sexual Reproduction in Flowering Plants · MEDIUM
During megasporogenesis in flowering plants, the megaspore mother cell undergoes meiosis to produce four megaspores. In the most common type of embryo sac development (Polygonum type), which of the following correctly describes the fate of these megaspores?
Q3 · Sexual Reproduction in Flowering Plants · MEDIUM
During double fertilisation in angiosperms, one male gamete fuses with the egg cell to form the zygoid (2n), while the other male gamete fuses with the polar nuclei. If the egg cell is haploid (n) and there are two polar nuclei (each n), what is the ploidy of the primary endosperm nucleus (PEN) formed after triple fusion?
Q4 · Sexual Reproduction in Flowering Plants · HARD
In a mature embryo sac of an angiosperm (Polygonum type), the cells are arranged in a specific pattern. At the micropylar end, there are three cells forming the egg apparatus, and at the chalazal end, there are three antipodal cells. The central cell contains two polar nuclei. If a mutation causes one of the synergids to possess two nuclei instead of one, and this synergid participates in the fertilisation process along with the egg, what would be the expected ploidy of the structure formed if a male gamete mistakenly fuses with this abnormal synergid instead of the polar nuclei?
Q5 · Sexual Reproduction in Flowering Plants · HARD
A flowering plant produces seeds without fertilization. This phenomenon is known as: