PHOTOSYNTHESIS

The overall reactions of photosynthesis are best summarized as …

• 12 CO₂ + 6 H₂O → C₆H₁₂O₆ + 12 O₂ + 6 H₂O.

• C₆H₁₂O₆ + 6 O₂ + 6 H₂O → 6 CO₂ + 12 H₂O.

• 6 CO₂ + 12 H₂O → C₆H₁₂O₆ + 6 O₂ + 6 H₂O.

• 6 CO₂ + 12 H₂O → C₆H₁₂O₆ + 12 O₂.

One of the products of the light-dependent reaction is

• ATP.

• PGAL.

• NADH.

• NADPH

Red and blue light support the highest rates of photosynthesis because …

• Chlorophylls absorb light of these wavelengths more than other wavelengths.

• These are the only wavelengths that carotenoids cannot absorb.

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

• Light of these wavelengths activate the ATP synthase enzyme.

Flattened sacs of internal membranes associated with photosynthesis are called …

• Chloroplasts.

• The stroma.

• Cristae.

• Thylakoids.

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.

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

What is the primary function of the Calvin Cycle?

• It converts glucose into ATP.

• It uses ATP and NADPH to convert CO₂ into glucose.

• It captures light energy to produce ATP and NADPH.

• It releases oxygen into the atmosphere.

What is the role of water in photosynthesis?

• It acts as a source of electrons.

• It provides carbon dioxide for the Calvin Cycle.

• It absorbs light energy.

• It acts as a transport medium for nutrients.

Which of the following is a product of the light-dependent reactions of photosynthesis?

• Glucose

• Carbon dioxide

• Oxygen

• Water