NEET 2013 · Class 12

Organisms and Populations

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is

  1. (A)commensalism
  2. (B)amensalism
  3. (C)ectoparasitism
  4. (D)symbiosis

The NCERT line that answers it

Verbatim line

The interaction where one species is benefitted and the other is neither benefitted nor harmed is called **commensalism**.

Chapter
Organisms and Populations
Section
11.1.4 Population Interactions
Page
9
Words matched
18 of 18

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

6667, emb=0.7988, combined=0.746). Verified: high — The span explicitly defines commensalism as 'one species benefitted and the other neither benefitted nor harmed,' which directly matches the sea anemone-hermit crab association described in the question.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Question text is reproduced from the published NEET 2013 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.