In the process of grafting,what is the name given to the part of the plant that is attached to the cut stem of another plant?

Differentiate between binary fission and multiple fission.

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

What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

Write true or false for the statement: Along the path of the $vas \ deferens$,glands like the prostate and the seminal vesicles add their secretions for the nutrition and easier transport of the sperms.

Give two examples each of the following:
$(a)$ Plants having unisexual flowers
$(b)$ Agents of pollination
$(c)$ Physical changes on puberty that are common to both boys and girls.