This question was dropped/deleted by RPSC in the final answer key; physiologically, cold-hardy freeze-avoiding insects synthesize low-molecular-weight polyols such as glycerol, sorbitol, mannitol, and erythritol as cryoprotectants to depress their supercooling point.

• Sorbitol: Polyol cryoprotectant accumulated in diapause.
• Glycerol: The most abundant and widespread cryoprotectant in insect haemolymph.
• Erythritol: Low-molecular-weight polyol serving as cryoprotectant in arctic beetles.
• All of the above: All listed compounds function biologically as cryoprotectants.

In insect ecology, fecundity is strictly defined as the physiological potential reproductive capacity of a female measured by the rate and total number of ova (eggs) produced, whereas fertility refers to the rate of producing viable offspring (fertilized eggs).

• The rate at which females produce ova: Rigorous biological definition of fecundity.
• The rate at which females produce new individuals i.e. fertilized eggs: Definition of fertility.
• Both (1) & (2): Incorrect conflation of fecundity and fertility.
• None of these: Incorrect.

Thrips (order Thysanoptera) possess 1- or 2-segmented tarsi ending in a specialized eversible bladder-like vesicle called an arolium (hence named Physopoda); stating they have two-segmented tarsi without claws as a blanket diagnosis without vesicular arolium or universally 2-segmented is considered incorrect.

• They have fringed wings with long hairs: Completely true, character of Thysanoptera.
• Have rasping-sucking mouthparts: Completely true, asymmetrical mouthparts with left mandible only.
• Have two segmented tarsi without claws: Designated incorrect statement in the official answer key.
• None of the above: Incorrect option.