Photosynthesis 1 (MJC)

Based on the graph above, at what light intensity is both photosynthesis and respiration occurring at the same time?

1) 0
2) 40
3) 80
4) 120

The main function of A, the _________, is for the ____________.

1) granum, photolysis of water
2) stroma, carbon fixation
3) grana, photolysis of water
4) grana, photoactivation

What are the products of light-dependent reactions of photosynthesis?

1) Oxygen, ATP and NADP
2) Water, ADP and NADPH
3) Oxygen, ADP and NADPH
4) Oxygen, ATP and NADPH

Carbon dioxide labeled with ¹⁴C has been used to identify intermediate compounds in the Calvin cycle. Which compound will be the first to contain ¹⁴C?

1) RuBP
2) Glyceraldehyde-3-phosphate
3) Glycerate-3-phosphate
4) Glucose

During photosynthesis, which process releases electrons to replace the electrons lost from the chlorophyll a molecules?

1) Photoactivation of photosystem I
2) Photolysis of water
3) Carbon fixation
4) Chemiosmosis

A weed killer DCMU blocks the flow of electrons from the electron transport chain in photophosphorylation.
Why does this kill the plant?

1) Active transport of mineral salts is prevented.
2) Glycerate-3-phosphate cannot be formed.
3) Photolysis of water does not occur.
4) ATP and NADPH are not produced.

The coenzyme used in photosynthesis is

1) NAD
2) ATP
3) FAD
4) NADP

Electrons from the non-cyclic photophosphorylation is passed into the light-independent reaction via

1) ATP
2) reduced NAD
3) ADP
4) reduced NADP

The evolution of oxygen during photosynthesis occurs in the

1) light-dependent reaction when carbon dioxide is split
2) light-dependent reaction when water is split
3) light-independent reaction when carbon dioxide is split
4) light-independent reaction when water is split

The light intensity at which the rate of photosynthesis is equal to the rate of respiration is known as the

1) equilibrium point
2) photorespiration point
3) compensation point
4) equalisation point

Which of the following statement(s) is true?

1) Cyclic photophosphorylation involves both PSI and II while non-cyclic involves PSII only
2) Cyclic photophosphorylation involves NADP reductase while non-cyclic involves ATPase only.
3) The final electron acceptor in cyclic photophosphorylation is PSI while NADP is the final electron acceptor in non-cyclic.
4) ATP and oxygen are the products formed during cyclic while in non-cyclic, only ATP is formed.

Which of the enzymes below are NOT involved in non-cyclic photophosphorylation?

1) RUBISCO
2) ATP synthase
3) NADP reductase
4) None of the above

Which of the following is true?

1) Chlorophylls absorb only light with the wavelength of 440 to 500nm.
2) Photosystem II contains a special chlorophyll a that absorbs light at wavelength of 700 nm
3) Carotenoids absorb light at the wavelength of 440 to 500nm only.
4) Carotenoids absorb light at the wavelength of 650 to 680 nm only.

The protons pass through the thylakoid membrane from the thylakoid space to the stroma via

1) endocytosis
2) osmosis
3) active transport
4) facilitated diffusion

Which of the following limiting factor does not directly affect non-cyclic photophosphorylation?

1) Carbon dioxide concentration
2) Temperature
3) Light intensity
4) Light colour