NEET 2021 · Class 11

Body Fluids and Circulation

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

  1. (A)Thrombin
  2. (B)Renin
  3. (C)Epinephrine
  4. (D)Thrombokinase

The NCERT line that answers it

Verbatim line

Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.

Chapter
Body Fluids and Circulation
Section
15.1.4 Coagulation of Blood
Page
3
Words matched
16 of 16

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

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin,' which directly matches the question's requirement and distinguishes thrombin from other options.

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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.

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Question text is reproduced from the published NEET 2021 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.