The process by which cells undergo changes to perform their specific functions is known as .......

Assertion: Specialization of cells is useful for an organism.
Reason: It increases the operational efficiency of an organism.

Explain in $2-3$ lines each of the following terms with the help of examples taken from different plant tissues.
$(a)$ Differentiation
$(b)$ De-differentiation
$(c)$ Re-differentiation

Development includes (plants):
$I.$ Differentiation
$II.$ Redifferentiation
$III.$ Dedifferentiation
Select the right combination from the given options.

Which process leads to the formation of a zygote,and which process results in the formation of tissues?

The cells formed by repeated divisions of the zygote undergo ... to form tissues, organs, and organ systems.