Photosynthesis & Plant MCQs with Answers

The gas released by the trees after sunrise is _?

• A.Hydrogen
• B.Carbon dioxide
• C.Nitrogen
• D.Oxygen

The CO₂ acceptor in the Calvin cycle is ?

• A.Ribulose phosphate
• B.Phosphoglyceric acid
• C.Ribulose bisphosphate (RuBP)
• D.Phosphoglyceraldehyde

The first stable product of light independent reaction having 3-carbons is ?

• A.Oxaloacetic acid
• B.Ribulose bisphosphate
• C.Glyceraldehyde-3-phosphate
• D.3-phosphoglyceric acid

The functional group in chlorophyll is?

• A.Porphyrin ring with Ca²⁺
• B.Porphyrin ring with Fe²⁺
• C.Pyrimidine ring with Mg²⁺
• D.Porphyrin ring with Mg²⁺

Which of the following light properties affects photosynthesis?

• A.Light intensity
• B.Light quality (wavelength)
• C.Light duration
• D.All of these

Carbon dioxide enters into plants through ?

• A.Stomata
• B.Root hairs
• C.Lenticels
• D.Cuticle

Past Paper MCQ

The absorption of wavelength light by a leaf is determined by?

• A.Spectrophotometer
• B.Microscope
• C.Calorimeter
• D.Photometer

Suitable temperature for photosynthesis is between _?

• A.40°C to 50°C
• B.10°C to 20°C
• C.25°C to 35°C
• D.0°C to 10°C

The materials required for photosynthesis are _?

• A.Glucose (C6H12O6) and Oxygen (O2)
• B.Water (H2O) and Oxygen (O2)
• C.Water (H2O) and Carbon Dioxide (CO2)
• D.Carbon Dioxide (CO2) and Glucose (C6H12O6)

Some photosynthetic organisms contain chloroplasts that lack photosystem II yet can survive. The best way to detect the 'lack of photosystem II' in these organisms would be ?

• A.To test for ATP synthesis in the dark
• B.To test for CO₂ fixation in the dark
• C.To test for glucose production in the light
• D.To test for liberation of O₂ in the light