In which method is a branch of the stem bent and buried in the soil to perform vegetative propagation?

$(a)$ List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
$(b)$ $(i)$ Name the part marked '$A$' in the diagram.
$(ii)$ How does '$A$' reach part '$B$'?
$(iii)$ State the importance of the part '$C$'.
$(iv)$ What happens to the part marked '$D$' after fertilisation is over?

What changes are observed in the uterus subsequent to implantation of the young embryo?

At approximately what age does menstruation permanently cease in females?

Write two points of difference between asexual and sexual types of reproduction. Describe why variations are observed in the offspring formed by sexual reproduction.

In a flower, the parts that produce male and female gametes (germ cells) are