Question

question 21 (1 point)
energy in the reaction centre of a photosystem comes from
bond energy.
red light.
absorbed photons.
green light.
potential energy.
question 22 (1 point)
plant chloroplasts have how many photosystems?
one
two
three
four
three for a c3, but four for a c4 plant.

Explanation:

• For Question 21: In photosystems, the reaction - centre energy comes from absorbed photons which excite electrons. Red and green light are just types of light, and bond energy and potential energy are not the direct source here.
• For Question 22: Plant chloroplasts have two photosystems, namely photosystem I and photosystem II.

Answer:

Question 21: C. absorbed photons
Question 22: B. two