Photosynthesis Quiz

What did Joseph Priestley conclude from his experiment with a mint plant, a mouse, and a candle?

• Plants do not affect the air quality.

• Plants need darkness to survive.

• Plants can replace the air used by a mouse and candle.

• Plants produce carbon dioxide.

What is the primary function of grana in photosynthesis?

• To store glucose.

• To trap sunlight and produce ATP and NADPH.

• To release oxygen.

• To absorb carbon dioxide.

Which pigment is the chief pigment involved in photosynthesis?

• Chlorophyll b

• Xanthophylls

• Carotenoids

• Chlorophyll a

What is the first stable product formed in the Calvin cycle?

• Ribulose bisphosphate

• Oxaloacetic acid

• 3-phosphoglycerate

• Glucose

Which enzyme catalyzes the carboxylation reaction in C4 plants?

• Rubisco

• Phosphoglycerate kinase

• PEP carboxylase

• Glyceraldehyde 3-phosphate dehydrogenase

What is the main reason C4 plants are more efficient in hot and dry conditions?

• They have larger leaves.

• They undergo carboxylation twice, reducing photorespiration.

• They can store more water.

• They have more chlorophyll.

What is the law of limiting factors as proposed by Frederick Blackman?

• Photosynthesis is only affected by light intensity.

• The rate of photosynthesis is determined by the factor nearest to its minimal value.

• Only carbon dioxide concentration affects photosynthesis.

• Photosynthesis is not affected by external factors.

At what light intensity does the photosynthesis rate reach its saturation point?

• 100% of full sunlight

• 10% of full sunlight

• 5% of full sunlight

• 50% of full sunlight

How does water stress affect photosynthesis?

• It has no effect on photosynthesis.

• It causes the stomata to close, reducing carbon dioxide intake.

• It increases the surface area of leaves.

• It increases the rate of photosynthesis.

Which type of plants show saturation of photosynthesis rate at 360 microliters per liter of CO2?

• C3 plants

• Neither C3 nor C4 plants

• C4 plants

• Both C3 and C4 plants