In higher vertebrates, the immune system can distinguish selfcells and non-self. If this property is lost due to genetic abnormality and it attacks selfcells, then it leads to

A autoimmune disease
B active immunity
C allergic response
D graft rejection.

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Answer & Solution

Correct Answer

(A) autoimmune disease

Step-by-step Solution

Detailed explanation

(a) : Autoimmunity is a disorder of the body’s defence mechanisms in which an immune response is elicited against its own tissues, which are thereby damaged or destroyed. Autoimmunity may be caused due to genetic or environmental factors.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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From NEET

Match List-I with List-II

\(\text{List - I}\)	\(\text{List - II}\)
\(\text{A. Haber process}\)	\(\text{I. Fe catalyst}\)
\(\text{B. Wacker oxidation}\)	\(\text{II. \(\text{PdCl} _2\)}\)
\(\text{C. Wilkinson catalyst}\)	\(\text{III.}\) \(\left[\left(\text{PPh} _3\right)_3\text{RhCl} \right]\)
\(\text{D. Ziegler catalyst}\)	\(\text{IV.}\) \(\text{TiCl} _4\) with \(\text{Al} \left(\text{CH} _3\right)_3\)

Choose the correct answer from the options given below :

NEET 2025 Medium

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\((a)\) Fourth trophic level	\((i)\) Crow
\((b)\) Second trophic level	\((ii)\) Vulture
\((c)\) First trophic level	\((iii)\) Rabbit
\((d)\) Third trophic level	\((iv)\) Grass

In higher vertebrates, the immune system can distinguish self­cells and non-­self. If this property is lost due to genetic abnormality and it attacks self­cells, then it leads to

Step-by-step Solution

In higher vertebrates, the immune system can distinguish selfcells and non-self. If this property is lost due to genetic abnormality and it attacks selfcells, then it leads to