Sexual reproduction in flowering plants practice · Hard

Option B (Both A and R are true and R is not the correct explanation of A) is correct because both the assertion and reason are true statements, but the reason doesn't explain the assertion.

Option B (Elephant) is correct because elephants are known to disperse the seeds of Rafflesia by consuming the fruits and excreting the seeds in different locations.

Option A ($4 n$ and $3 n$) is correct because the PEN is formed by the fusion of two polar nuclei (2n+2n) from the female and one sperm (4n/2 = 2n) from the male, resulting in 4n, and the zygote is formed by the fusion of one egg (2n) and one sperm (2n) resulting in 4n/2 + 2n = 3n.

Option C (Dry and edible pollen grains) is correct because anemophilous and hydrophilous flowers typically have non-edible pollen grains, as they are not meant to attract pollinators for food. They are also dry to facilitate wind dispersal.

Option B (Cladophora) is correct because Cladophora involves the fusion of morphologically similar gametes (isogametes).

Option A (Carion flies) is correct because Rafflesia, known for its carrion-like odor, attracts carrion flies for pollination.

Option A (Vegetative cell is not damaged) is correct because the vegetative cell controls pollen tube growth, and if it remains intact, the pollen tube can still form despite the generative cell being destroyed.

Option D (Both (1) and (2)) is correct because nucellar and integumentary embryos are derived from maternal tissue and are genetically identical to the female plant.

Option D (Has seven celled eight nucleated structure and is monosporic) is correct because the Polygonum type embryo sac is the most common type and has this structure and origin.

Option B (Versatile stamens) is the feature NOT of entomophilous flowers because versatile stamens are more commonly associated with anemophilous (wind-pollinated) flowers.

Option C (16) is correct because each pollen mother cell produces 4 pollen grains. Therefore, to produce 64 pollen grains, 16 pollen mother cells are required (64 / 4 = 16).

Option C (Vallisneria) is correct because Vallisneria is a classic example of a plant that undergoes hydrophily, or pollination by water.

Option D (Mango) is correct because Neelakuranji, wheat, and radish are monocarpic plants (flowering once in their lifetime), while mango is a polycarpic plant (flowering many times).