Which part of the plant is the reproductive organ?

Why are budding,fragmentation,and regeneration all considered as asexual types of reproduction? With neat diagrams,explain the process of regeneration in Planaria.

Which sex hormone is produced by the testes in males?

''Variations'' are seen in the organisms. State the two main causes of variation.

Explain how organisms create an exact copy of themselves.

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