$$ \text { P - iv; } \quad \text { Q - i; } \quad \mathrm{R}-\mathrm{ii} ; \quad \mathrm{S}-\mathrm{iii} $$

P - iv; Q - ii; R - i; S - iii

$$ \mathrm{P}-\mathrm{i} ; \quad \mathrm{Q}-\mathrm{iii} ; \quad \mathrm{R}-\mathrm{ii} ; \quad \mathrm{S}-\mathrm{iv} $$

$$ \mathrm{P}-\mathrm{iii} ; \quad \mathrm{Q}-\mathrm{i} ; \quad \mathrm{R}-\mathrm{ii} ; \quad \mathrm{S}-\mathrm{iv} $$

Centromere

Centrosome

Centriole

Telomere

Three fatty acid chains linked to a molecule of glycerol

Three glycerol molecules linked to a fatty acid chain

Three saturated fatty acid chains linked to a molecule of cholesterol

Three glyceride molecules linked to a molecule of phospholipid

It provides precursor for the synthesis of stress hormone in plants.

It protects chlorophyll $a$ from photo-oxidation.

It is an accessory pigment which absorbs light at $600-700 \mathrm{~nm}$.

It accumulates in chromoplasts during fruit ripening.