Question

the ________ in plants is directly responsible for absorbing light energy.
a. stroma
b. thylakoid
c. grana
d. chlorophyll
please select the best answer from the choices provided
a
b
c
d

Explanation:

• Stroma: It is the fluid - filled space in the chloroplast where the Calvin cycle occurs (dark reaction of photosynthesis) and does not absorb light energy.
• Thylakoid: It is a membrane - bound structure in the chloroplast. While thylakoids contain chlorophyll (the pigment that absorbs light), the thylakoid itself is a structure, not the direct absorber of light energy.
• Grana: Grana are stacks of thylakoids. Similar to thylakoids, they are structures that contain the light - absorbing pigment (chlorophyll) but are not the direct absorbers.
• Chlorophyll: Chlorophyll is a pigment. Pigments have the property of absorbing light energy (specific wavelengths). Chlorophyll (especially chlorophyll a and b) in plants absorbs light energy which is then used in the light - dependent reactions of photosynthesis.

Answer:

D. chlorophyll