At approximately what age does menstruation permanently cease in females?

How are general growth and sexual maturation different from each other?

$(i)$ Some organisms have the capacity of reproducing by using a single parent. Such organisms have a simple body structure.
$(a)$ What is this method called?
$(b)$ Name any four types of this method.
$(c)$ Give two examples of organisms using this method for reproduction.
$(ii)$ Identify the method of reproduction used by $Spirogyra$ and $Rhizopus$.

$A$ part of the male reproductive system is shown below. Study the diagram and answer the questions that follow.
$(a)$ Two parts have been incorrectly labelled. Identify them.
$(b)$ Give the function of urethra.
$(c)$ Which hormone is released by testis?

What is the number of chromosomes in a human sperm cell?

The ability of a cell to divide into several cells during reproduction in $Plasmodium$ is called