Reproduction is essential for living organisms in order to

$(a)$ Name the parts labelled as $A, B, C$ and $D$ in the diagram given below:
$(b)$ What is pollination? State its significance.
$(c)$ How does fertilization occur in flowers? Name the parts of the flower that develop into $(i)$ seed,and $(ii)$ fruit after fertilization.

In the figure,the parts $A$,$B$,and $C$ are sequentially:

Which of the following sexually transmitted diseases is caused by a virus?

$(i)$ $(a)$ Write the full form of $DNA$.
$(b)$ State the role of $DNA$ in the cell nucleus.
$(c)$ What will be the after-effect if the information of the $DNA$ is changed?
$(ii)$ Explain the importance of $DNA$ copying in reproduction.

What happens to the following parts of a flower after fertilization?
$(i)$ Ovum (Egg cell)
$(ii)$ Ovary
$(iii)$ Ovule
$(iv)$ Sepals and petals