$A$ chemical substance that,when irradiated with $UV$ rays,absorbs radiation and emits visible light is called:

The best microscope to study the fine structure of a cell is .....

$S$ - Statement: Mitochondria are associated with the process of respiration.
$R$ - Reason: Chloroplasts are associated with the process of photosynthesis.

Column-$I$ lists organelles and Column-$II$ lists their functions. Select the correct option:

Column-$I$	Column-$II$
$(A)$ Mitochondria	$(i)$ Suicidal bag
$(B)$ Chloroplast	$(ii)$ Synthesis of steroids
$(C)$ Lysosome	$(iii)$ Photosynthesis
$(D)$ Smooth Endoplasmic Reticulum	$(iv)$ $ATP$ production

Assertion : Both Endoplasmic reticulum and vacuoles are the part of endomembrane system.
Reason : Functions of both endoplasmic reticulum and vacuoles are not coordinated.

Which of the following is an incorrect pair?