Which of the following organisms undergoes binary fission?

List any two differences between pollination and fertilization.

"The chromosomal number of the sexually reproducing parents and their offspring is the same." Justify this statement.

In the process of reproduction as used in $Spirogyra$,the organism splits itself into small pieces.
$(a)$ What is this process of reproduction called?
$(b)$ Will this type of reproduction be asexual or sexual reproduction? Answer with reason.
$(c)$ Is this process same as regeneration? Give reasons.

Which is the primary sex organ of the male reproductive system?

Regeneration is not possible in all types of animals. Why?