Understanding Photosynthesis

What are the main products of the light-dependent reactions?

• Oxygen, glucose, and pyruvate

• Oxygen, ATP, and NADPH

• Carbon dioxide, NADH, and glucose

• Glucose, ATP, and FADH2

Describe the role of chlorophyll in photosynthesis.

• Chlorophyll releases energy as heat during photosynthesis.

• Chlorophyll is responsible for the absorption of nutrients from the soil.

• Chlorophyll converts sunlight directly into chemical energy without any reactions.

• Chlorophyll absorbs light energy for photosynthesis, enabling the conversion of carbon dioxide and water into glucose and oxygen.

What is the primary function of the Calvin cycle?

• To convert carbon dioxide into glucose.

• To store energy in the form of ATP.

• To produce oxygen from sunlight.

• To break down glucose into carbon dioxide.

How does light intensity affect the rate of photosynthesis?

• Light intensity has no effect on photosynthesis.

• Photosynthesis occurs only in complete darkness.

• Higher light intensity decreases the rate of photosynthesis.

• Increased light intensity generally increases the rate of photosynthesis up to a saturation point.

Explain the significance of water in the photosynthesis process.

• Water is only important for plant hydration, not photosynthesis.

• Water is a vital reactant in photosynthesis, providing electrons and protons for energy production.

• Water is a byproduct of photosynthesis, not a reactant.

• Water is used to absorb sunlight during photosynthesis.

What are the two main stages of photosynthesis?

• Light absorption and Water splitting

• Photosynthesis and Respiration

• Carbon fixation and Oxygen release

• Light-dependent reactions and Light-independent reactions (Calvin cycle)

How do temperature changes influence photosynthesis?

• Temperature changes influence photosynthesis by affecting enzyme activity and metabolic processes, with optimal temperatures increasing rates and extremes causing declines.

• Photosynthesis is solely dependent on light intensity, not temperature.

• Higher temperatures always decrease photosynthesis rates.

• Temperature changes have no effect on photosynthesis.

What is the role of NADPH in photosynthesis?

• NADPH is used to absorb sunlight during photosynthesis.

• NADPH transports oxygen to the chloroplasts.

• NADPH is a byproduct of the Calvin cycle.

• NADPH provides reducing power for the synthesis of glucose in the Calvin cycle.

Describe how carbon dioxide concentration affects photosynthesis.

• Increased carbon dioxide concentration leads to a decrease in plant growth.

• Higher carbon dioxide concentration increases the rate of photosynthesis, up to a saturation point.

• Higher carbon dioxide concentration decreases the rate of photosynthesis.

• Photosynthesis is unaffected by carbon dioxide concentration.

What happens to chlorophyll when it absorbs light?

• Chlorophyll excites electrons, initiating photosynthesis.

• Chlorophyll turns into a different pigment when exposed to light.

• Chlorophyll cools down and stops photosynthesis when light is absorbed.

• Chlorophyll absorbs light and releases oxygen directly.