NEET · Biology · STD 11 - 8. Cell the unit of life

Pigment containing membranous extensions in some cyanobacteria are

A pneumatophores
B chromatophores
C heterocysts
D basal bodies

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Answer & Solution

Correct Answer

(B) chromatophores

Step-by-step Solution

Detailed explanation

(b) : Chromatophore is a pigmented lamellar or vesicular structure that can be isolated from disrupted photosynthetic bacteria or cyanobacteria. Their plasma membrane may be projected in folds into the cytoplasm forming lamellae that have, therefore, double unit membrane structure. The pigments and most of the enzymes required for the light induced electron transport and phosphorylation processes of photosynthesis, are located in the plasma membrane and lamellae.

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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