Photosynthesis Photosynthesis Pigments and Absorption

Question 1

Which pigment primarily absorbs red and blue wavelengths of light during photosynthesis in plants?

Accepted Answer

Chlorophyll a

Answer

Carotene

Answer

Xanthophyll

Answer

Phycocyanin

Question 2

Why do most plant leaves appear green to the human eye?

Accepted Answer

Chlorophyll reflects green wavelengths rather than absorbing them

Answer

Chlorophyll absorbs only green light

Answer

Green light has the highest energy of all visible wavelengths

Answer

Leaves contain more xanthophylls than chlorophyll

Question 3

What is the primary function of accessory pigments such as carotenoids and chlorophyll b in photosynthesis?

Accepted Answer

Capture light energy from a broader range of wavelengths and transfer it to chlorophyll a

Answer

Directly reduce CO2 in the Calvin cycle

Answer

Pump protons across the thylakoid membrane

Answer

Break down water molecules to release oxygen

Question 4

What is the approximate absorption peak of chlorophyll a in the red region of the visible spectrum?

Accepted Answer

680 nm

Answer

500 nm

Answer

550 nm

Answer

750 nm

Question 5

Which photosynthetic pigment is responsible for the orange color of carrots and also assists in harvesting light energy?

Accepted Answer

Beta-carotene

Answer

Chlorophyll b

Answer

Anthocyanin

Answer

Phytochrome

Question 6

What is the name of the graph that plots the rate of photosynthesis against different wavelengths of light?

Accepted Answer

Action spectrum

Answer

Absorption spectrum

Answer

Emission spectrum

Answer

Fluorescence spectrum