IB Biology Photosynthesis

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose, using carbon dioxide and water.

Front

What are the two main stages of photosynthesis?

Back

The two main stages of photosynthesis are the light reactions and the Calvin cycle (light-independent reactions).

Front

What is the primary pigment involved in photosynthesis?

Back

Chlorophyll is the primary pigment involved in photosynthesis, responsible for absorbing light energy.

Front

What is the role of ATP in photosynthesis?

Back

ATP (adenosine triphosphate) provides the energy required for various biochemical reactions during the Calvin cycle.

Front

What is NADPH and its function in photosynthesis?

Back

NADPH (nicotinamide adenine dinucleotide phosphate) is an electron carrier that provides reducing power for the Calvin cycle.

Front

Where do the light reactions of photosynthesis occur?

Back

The light reactions occur in the thylakoid membranes of the chloroplasts.

Front

What is the main product of the light reactions?

Back

The main products of the light reactions are ATP, NADPH, and oxygen.

Front

What is the Calvin cycle?

Back

The Calvin cycle is a series of biochemical reactions that take place in the stroma of chloroplasts, where carbon dioxide is fixed into glucose.

Front

What is the significance of chlorophyll a and b?

Back

Chlorophyll a and b are essential for capturing light energy; chlorophyll a is the primary pigment, while chlorophyll b assists in capturing additional light wavelengths.

Front

What are carotenoids and their role in photosynthesis?

Back

Carotenoids are accessory pigments that absorb light in different wavelengths and protect plants from damage by excess light.