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Assertion: Stroma lamellae have both PS ...

Assertion: Stroma lamellae have both PS I and PS II but the membrane of grana lack PS II as well as NADP reductase.
Reason: Cyclic photophosphorylation also occurs when only light of wavelength below 680 nm is available for excitation.

A

If both assertion and reason are true and the reason 1s the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Membrane of grana have both PS I and PS II but the Struma lamellae lack PS II as well as NADP reductase.
Cyclic photophosphorylation also occurs when only light of wavelength beyond 680 nm is available for excitation.
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Similar Questions

Explore conceptually related problems

Assertion: The stoma lamellae have both PS I and PS II. Reason: The grana lamellae lack PS II and well as NADP reductase enzyme.

Cyclic photophosphorylation occurs when only light of wavelengths _______ are available. (i) Below 680 nm (ii) Beyond 680 nm (iii) 400 nm and below (iv) Beyond 400 nm

Knowledge Check

  • Which process also occurs when only light of wavelengths beyond 680 nm are available for excitation?

    A
    Cyclic photophosphorylation
    B
    Non-cyclic photophosphoylation
    C
    Both (1) and (2)
    D
    None of these

  • Cyclic photophosphorylation occurs only when available wavelength of light for excitation is

    A
    Below 300nm
    B
    Beyond 680nm
    C
    Below 400nm
    D
    Beyond 300nm

  • Assertion : The stromal thylakoids are rich in both PS I and PS II Rason : The granal membranes are rich in ATP synthetase.

    A
    If both the asserition and the reasion are true and the reason is a correct explanation of the assertion
    B
    If both the assertion and reasoni s not a correct ecplanation of the assertio
    C
    If the assertion is true but the reason is false
    D
    If both the asseertion and reason are false

    • Similar Questions

    Explore conceptually related problems

    Assertion :- In Stroma lamellae cyclic photophosphorylation is the only mean of ATP synthesis Reason :- In stroma lamellae both PS-II and NADP reductase enzyme are absent.

    Assertion :- Both PS-I and PS-II are located on stroma thylakoid membrane Reason :- Photolysis of water and reduction of NADP^(+) takes place in stroma site.

    Assertion. In light reaction of photosynthesis, light is required for the functioning of PS I and PS II and Production of NADPH and ATP. Reason. Dark reaction does not occur in light.

    Assertion: PS I and PS II are named in sequence of their function during the light reaction or photochemical phase. Reason: Each photosystem has one molecule of chlorophyll-a forming a light harvesting complex called antenna.

    Assertion: The whole scheme of transfer of electrons, starting from the PS II uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally downhill to NADP^(+) causing it to be reduced to NADPH^(+) H^(+)~ is called the Z scheme or cyclic photophosphorylation. Reason: Both ATP and NADH + H^(+) are synthesised by this kind of electron flow.

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