Photosynthesis

Red and blue light support the highest rates of photosynthesis because

• Only wavelength that carotenoid cannot absorb

• Chlorophylls absorb light of these wavelengths more then other wavelengths

• Light of these wavelengths have the highest energy in the visible spectrum

• Light of these wavelengths activate ATP synthase enzyme

Cyclic photophosphorylation differs from non-cyclic photophosphorylation in that ___________ is not made from the process

• ATP

• PGAL

• NADH

• NADPH

Flattend sacs of internal membranes associated with photosynthesis are called

• Chloroplasts

• The stroma

• Cristae

• Thylakoids

The role of water molecule in light dependent reaction is to

• Hydrolyse NADP⁺ at the end of the ETC

• Involve directly in the production of ATP

• Replace the excited electron of reaction centre molecule in photosystem II

• Involve directly in Calvin Cycle

Which statement is FALSE?

• Thylakoid membranes contain the photosynthetic pigments.

• The oxygen released during photosynthesis comes from water.

• RuBP is produced during cyclic photophosphorylation in the light dependent reactions.

• The light dependent reactions provide the energy for the Calvin cycle.

Light independent reaction occurs in …

• Stroma.

• Thylakoid space.

• Intermembrane space.

• Thylakoid membrane.

Which of the following plants fixes carbon dioxide at night?

• Sugarcane.

• Cactus.

• Oryza sativa.

• Hibiscus rosa-sinensis.

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

• To synthesise ATP from ADP and Pi.

• To concentrate photons inside the stroma.

• To pass electrons to ferredoxin and then NADPH

• To harvest photons and transfer light energy to the reaction-center chlorophyll.

Which of the following are products of the light reactions of photosynthesis that are utilised in the Calvin cycle?

• Electrons and H⁺

• CO₂ and glucose

• ATP and NADPH

• ADP, Pi and NADPH

Why are C₄ plants able to photosynthesise with no apparent photorespiration?

• They use PEP carboxylase to initially fix CO₂

• They conserve CO₂ more efficiently.

• They exclude oxygen from their tissues.

• They do not participate in Calvin cycle.