Photosynthesis and Plant Adaptations Quiz

What is the primary role of the enzyme Rubisco in the Calvin cycle?

• To release oxygen as a byproduct

• To convert glucose into energy

• To fix carbon dioxide into organic compounds

• To fix oxygen into organic compounds

Why do C3 plants lose photosynthetic efficiency?

• Due to high water loss

• Due to lack of sunlight

• Because of photorespiration

• Because they store CO2 at night

How do C4 plants limit oxygen access to Rubisco?

• By storing CO2 in vacuoles

• By using spatial isolation

• By using temporal isolation

• By closing stomata during the day

What is the main difference between C4 and CAM plants in terms of CO2 fixation?

• C4 plants use spatial isolation, CAM plants use temporal isolation

• C4 plants fix CO2 at night, CAM plants fix it during the day

• C4 plants are found in deserts, CAM plants are not

• C4 plants store CO2 in vacuoles, CAM plants do not

During CAM photosynthesis, when do stomata open?

• During the day

• At night

• Only during high temperatures

• Only during low temperatures

What compound is stored in vacuoles during CAM photosynthesis?

• Glucose

• Malic acid

• Pyruvate

• Oxaloacetate

Which enzyme is responsible for converting oxaloacetate to malate in CAM plants?

• PEP carboxy kinase

• NAD malate dehydrogenase

• PEP carboxylase

• Rubisco

What happens to malic acid during the daytime in CAM plants?

• It is converted to ATP

• It is used to produce glucose

• It is stored in vacuoles

• It is converted back to CO2 and pyruvate

Why do some CAM plants conserve CO2 in water-abundant environments?

• To store more glucose

• To prevent water loss

• To increase photosynthetic efficiency

• To exceed the rate of CO2 diffusion from the atmosphere

In which environments are CAM plants typically found?

• High-altitude mountains

• Deserts and shallow bodies of water

• Tropical rainforests

• Temperate forests