Question

Which of the following is not a parasitic adaptation?

• A. Loss of unnecessary sense organs
• B. Absence of adhesive organs or suckers
• C. Loss of digestive system
• D. High reproductive capacity

Hint:

Adaptations like adhesive organs enhance parasitic efficiency.

Answer 1

The Correct Option is B

Parasitic adaptations are specialized features that enable parasites to survive and thrive in or on their hosts. These typically include:

(A) Loss of unnecessary sense organs – Correct adaptation: Parasites often reduce or lose sense organs (e.g., eyes) as they rely on the host.

(B) Absence of adhesive organs or suckers – Not a parasitic adaptation: Most parasites require suckers, hooks, or adhesive organs (e.g., tapeworms, leeches) to attach to hosts.

(C) Loss of digestive system – Correct adaptation: Some parasites (e.g., tapeworms) absorb nutrients directly and lack a digestive system.

(D) High reproductive capacity – Correct adaptation: Parasites often produce many offspring to ensure transmission.

The correct answer is (B), as the absence of attachment structures would hinder parasitic survival.

Answer 2

Parasites have evolved specific adaptations to survive inside or on their hosts. These include:

• Loss of unnecessary sense organs : Parasites often live in dark or enclosed environments, so they lose eyes or other sensory structures that are not needed.
• Adhesive organs or suckers : Many parasites, such as tapeworms and leeches, develop suckers or hooks to attach to their host.
• Loss of digestive system : Some parasites absorb nutrients directly from the host, eliminating the need for a fully functional digestive tract.
• High reproductive capacity : Parasites produce large numbers of offspring to ensure survival in challenging environments.

However, the absence of adhesive organs or suckers is not a parasitic adaptation . Instead, most parasites rely on these structures to anchor themselves to their host.

• (A): Incorrect because loss of sense organs is a common adaptation.
• (B): Correct because the absence of adhesive organs contradicts parasitic survival strategies.
• (C): Incorrect because loss of digestive system is a known adaptation.
• (D): Incorrect because high reproductive capacity is essential for parasite survival