Photosynthesis

Which of these functions correctly describes the role of a dicotyledonous leaf?

• Control of transpiration

• Removal of poisonous gases from the air

• Absorption of radiant energy

• Food storage

Which of the following are products of photophosphorylation?

• ATP

• ADP

• NADP

• NADPH

On a warm, sunny day, photosynthesis is limited by

• temperature

• light intensity

• oxygen availability

• carbon dioxide availability

In the chloroplast, where are photosystems located?

• I

• II

• III

• IV

The role of the antenna complex in Photosystems I and II is to

• produce oxygen

• regenerate RuBP

• produce carbohydrates

• collect light energy

Which of the following occur in the Calvin cycle?

• Fixation of carbon dioxide and production of ATP

• Fixation of carbon dioxide and regeneration of RuBP

• Oxidation of NADPH and production of ATP

• Reduction of NADP and regeneration of RuBP

The graph shows the effects of increasing light intensity on the rate of photosynthesis. At which of the labelled stages would light be a limiting factor?

• I

• II

• III

• IV

The diagram shows the events in the Calvin cycle. What are X and Y respectively?

• Phosphoglyceric acid; Triose phosphate

• Triose phosphate; Phosphoglyceric acid

• Simple sugars; Proteins

• Acetyl CoA; Succinic acid

The yield of greenhouse crops is higher than that of field crops due to increased photosynthetic activity by the plants. Which TWO of the following factors MOST likely contribute to this?

• Constant application of farmyard manure

• Rotation of plants

• Humid air and moist soil conditions

• Higher than average carbon dioxide levels

In the chloroplast, ribulose bisphosphate carboxylase can be found in region

• I

• II

• III

• IV