$A$ clone is two or more individuals which are similar:

Identify which of the following organisms are monoecious and which are dioecious:
$(a)$ Earthworm ........... $(b)$ Chara ...........
$(c)$ Marchantia ........... $(d)$ Cockroach ...........

In fungi and plants,the bisexual condition is represented by $P$ and the unisexual condition is represented by $Q$. Choose the correct option for $P$ and $Q$.
$P \quad\quad Q$

What is the approximate lifespan of a tortoise?

Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?

Choose the incorrect statement.