Photosynthesis

Free energy is released in cyclic photophosphorylation.

• (a) By the formation of ATP.

• (b) During the excitation of chlorophyll

• (c) During the fluorescence of chlorophyll

• (d) During each of the redox reactions of the electron transport chain

What does “PSII splits water” mean?

• (a) Water is broken into monomers

• (b) A condensation reaction occurs

• (c) Water is reduced to yield hydrogen gas

• (d) Water is oxidised to yield protons, electrons and oxygen

During photosynthesis, electrons are continuously lost from the reaction centre of PSII. What source is used to replace these electrons?

• (a) Sunlight

• (b) O2

• (c) H2O

• (d) O3

Which of the following is not a product of light reaction of photosynthesis?

r

• (a) O2

• (b) ATP, NADPH2

• (c) High-energy electrons

• (d) Sugar

If green plant cells are incubated with O18-labelled CO2, what molecule will become radioactive as the cells are exposed to light?

• (a) ATP

• (b) Water

• (c) Sugar

• (d) O2

• (a) A

• (b) B

• (c) C

• (d) D

• a) (A) ATP -(B) 3PGA - (C) RuBP

• b) (A) 3PGA - (B) ATP -(C) SUGAR

• c) (A) RuBP - (B) 3PGA - (C) ATP

• d) (A)Sugar - (B) RuDP - (C) NADPH

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

• (a) The splitting of water

• (b) The absorption of light energy by chlorophyll

• (c) The flow of electrons from photosystem II to photosystem I

• (d) The synthesis of ATP

The requirement for the reduction of each molecule of CO2 through C3 cycle is

• (a) 3 NADH2, 2ATP

• (b) 2 NADPH2, 2ATP

• (c) 2 NADPH2, 3 ATP

• (d) 3 NADPH2, 3 ATP

During Calvin cycle the total number of CO2, ATP and NADPH molecules utilized and glucose, ADP and NADP molecules generated is

• (a) 31

• (b) 36

• (c) 61

• (d) 67