Photosynthesis

What is the ultimate source of all of humankind's food and oxygen?

• A) Fossilized photosynthetic fuels

• B) Aerobic respiration

• C) Photosynthesis

• D) Ozone layer

What are the two reactions involved in photosynthesis?

• A) Light and dark reactions

• B) Oxidation and reduction reactions

• C) Respiration and combustion reactions

• D) Hydrolysis and condensation reactions

Where do the light reactions of photosynthesis occur?

• A) Chloroplast stroma

• B) Thylakoid membrane

• C) Cytoplasm

• D) Nucleus

What is the main function of the light reactions in photosynthesis?

• A) Splitting of water into oxygen, protons, and electrons

• B) Conversion of CO2 into carbohydrates

• C) Production of ATP and NADPH

• D) Reduction of NADP+ to NADPH

Which molecule is NOT involved in the dark reactions of photosynthesis?

• A) ATP

• B) NADPH

• C) CO2

• D) Oxygen

What is the primary energy input into the global food chain?

• A) ATP

• B) NADPH

• C) Solar energy

• D) Oxygen

What is the role of the proton gradient across the thylakoid membrane?

• A) Production of ATP

• B) Reduction of NADP+ to NADPH

• C) Oxidation of water to oxygen

• D) Absorption of light energy

What is the main pigment responsible for absorbing light energy in photosynthesis?

• A) Chlorophyll

• B) Carotenoids

• C) Bilins

• D) Oxygen

Which of the following is NOT a function of photosynthesis?

• A) Production of oxygen

• B) Conversion of CO2 into carbohydrates

• C) Release of energy through respiration

• D) Formation of the ozone layer

Which part of the plant is primarily responsible for respiration?

• A) Leaf

• B) Root

• C) Stem

• D) Flower