Photosynthesis in Higher Plants

C₄ plants have better productivity because

• C₄ plants absorb more light

• C₄ plants absorb more CO₂

• C₄ plants does not carry photorespiration

• C₄ plants have more amount of RuBisCO

Assertion: Photorespiration interferes with the successful functioning of Calvin cycle.

Reason: Photorespiration oxidises ribulose1,5 biphosphate which is an acceptor of CO₂ in Calvin cycle.

• If both assertion and reason are true and reason is the correct explanation of assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Photorespiration shows formation of

• sugar but not ATP

• ATP but not sugar

• both ATP and sugar

• neither ATP nor sugar

Which of the following is correctly labelled for the given figure

• A: PS II; B : PS I; C :e^- acceptor, D: LHC

• A: LHC; B:e^- acceptor; C: PS I; D: PS II

• A: PS I; B:PS II; C:e^- acceptor; D: LHC

• A: e^- acceptor; B : LHC; C: PS Il; D: PS I

Kranz anatomy is usually associated with

• C₃ plants

• C₄ plants

• CAM plants

• C₃-C₄intermediate plants.

Assertion : The efficiency of C₄ plant is more than those of C₃ plant.

Reason : C₄ plants are more efficient in picking CO₂.

• If both assertion and reason are true and reason is the correct explanation of assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Cyclic photophosphorylation involves

• PS I

• PS II

• PS I and PS II

• P₆₈₀

The first stable product of Calvin cycle is

• 3- phosphoglycerate

• 1, 3 biphosphoglycerate

• glyceralydehyde - 3 phosphate

• ribulose - 5 - phosphate

Assertion : Due to pollution atmospheric concentration of CO₂ is increasing which will be harmful for C₄ plants whereas productivity is going to increase for C₃ plants.

Reason : C4 plants have greater efficiency for CO₂ as CO₂ is fixed by PEP oxygenase.

• If both assertion and reason are true and reason is the correct explanation of assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

PS-II occurs only in

• stroma

• granal thylakoids

• stromal lamella

• matrix