Name two simple organisms having the ability of regeneration.

Which method of asexual reproduction occurs in $Spirogyra$?

Offspring formed by asexual method of reproduction have greater similarity among themselves because
$(i)$ asexual reproduction involves only one parent
$(ii)$ asexual reproduction does not involve gametes
$(iii)$ asexual reproduction occurs before sexual reproduction
$(iv)$ asexual reproduction occurs after sexual reproduction

Name the life process of an organism that helps in the growth of its population.

Most of the flowers in plants are of which type?

What is placenta? Describe its structure. State its functions in case of a pregnant human female.