Types of Photosynthesis in Plants: C3, C4, and CAM

What is the primary focus of this series on photosynthesis?

• The history of photosynthesis research

• The differences between metabolic pathways

• The diversity of plants

• The general mechanism of photosynthesis

Which enzyme is responsible for carbon fixation in C3 plants?

• NADP reductase

• ATP synthase

• Rubisco

• PEP carboxylase

Why is C3 photosynthesis less efficient in arid environments?

• It produces less oxygen

• It uses more water

• It leads to photorespiration

• It requires more sunlight

What is the initial carbon compound formed in C4 photosynthesis?

• OAA

• RuBP

• Glucose

• 3-PGA

How do C4 plants maintain photosynthesis during water stress?

• By storing CO2 in vacuoles

• By increasing photorespiration

• By using PEP carboxylase in mesophyll cells

• By opening stomata at night

What is a unique feature of CAM photosynthesis?

• Stomata open during the day

• Carbon fixation occurs in different cells

• CO2 is fixed into a four-carbon compound at night

• It is common in monocots

In CAM plants, when are the stomata open?

• When water is abundant

• At night

• Only during photosynthesis

• During the day