Photosynthesis and Chloroplast Quiz

Which part of the chloroplast is the site of the light-independent stage?

• Thylakoid lumen

• Grana

• Stroma

• Thylakoid membrane

Which structure increases the surface area for the light-dependent reactions?

• Stroma lamellae

• Thylakoid membranes

• Starch grains

• Chloroplast envelope

A student used chromatography to separate pigments. A pigment with the highest Rf value is most likely to be:

• Chlorophyll a

• Chlorophyll b

• Carotene

• Xanthophyll

What is the primary pigment in Photosystem I?

• Chlorophyll a

• Chlorophyll b

• Carotene

• Xanthophyll

A leaf was shaded for 24 hours, then tested with iodine. The result was negative for starch. Why?

• Photosystem II stopped working

• Chlorophyll pigments were destroyed

• No ATP and NADPH were produced for the Calvin cycle

• Rubisco enzyme denatured in darkness

What is the initial event in photoionisation?

• ATP hydrolysis

• Electrons excited in chlorophyll

• NADP reduction

• RuBP fixation

The photolysis of water produces:

• O₂, H⁺, e⁻

• CO₂, ATP, e⁻

• NADP, O₂, ATP

• ADP, Pi, e⁻

In a DCPIP experiment, why does DCPIP change from blue to colourless under bright light?

• It is oxidised by chlorophyll

• It gains electrons from chlorophyll

• It is hydrolysed by ATP synthase

• It absorbs red light

The proton gradient across the thylakoid membrane is used to:

• Split water molecules

• Reduce NADP

• Drive ATP synthase

• Pump electrons to PSI

A student grows algae at different light intensities. At low intensity, photosynthesis is slow because:

• Rubisco is saturated

• ATP and NADPH production is limited

• Thylakoid membranes break down

• Too much oxygen accumulates