Concept:Fertilization is the actual fusion of the male and female gamete nuclei.
Explanation:In higher organisms, fertilization occurs when the nucleus of a sperm fuses with the nucleus of an egg.
This fusion produces a zygote, which develops into a new individual.
Option A directly describes this nuclear fusion.
Option B only describes pollination, not fertilization.
Option C is incorrect because eggs are not ejaculated by the female, and pollen grains are not involved in animal fertilization.
Option D describes insemination, which is simply the deposition of sperm in the female body, not the actual fusion.
Therefore, the only true example of fertilization is the fusion of sperm and egg nuclei.
Answer:A. Fusion of sperm and egg nuclei