Question

Assertion :

In bacteria, photosynthesis occurs by utilizing wavelength longer than 700 mm.

Reason: Reaction centre is P${}_{890}$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

In bacterial photosynthesis, pigment-containing structures are chromatophores and pigments are bacteriochlorophyll and bacterioviridin. It is anoxygenic because PS II is absent (O${}_2$ evolution is absent). Because of the pigments photosynthesis occur by utilizing wavelength longer than 700 nm.

Only one pigment system is present whose photocenter is P${}_{890}$ (PS II absent). The action spectrum is Infra Red. During light reaction NAD${}^{+}$ being reduced to NADH.

Hence, the correct answer is 'Both Assertion and reason are correct but reason is not the correct explanation for assertion'.