Understanding Photosynthesis

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

• Glucose, ATP, and FADH2

• Oxygen, ATP, and NADPH

• Carbon dioxide, ATP, and NADPH

• Oxygen, Glucose, and NADH

Where do the light-dependent reactions occur in the chloroplast?

• Outer membrane

• Cytoplasm

• Thylakoid membranes

• Stroma

What role does chlorophyll play in photosynthesis?

• Chlorophyll acts as a nutrient for plant growth.

• Chlorophyll converts carbon dioxide into glucose.

• Chlorophyll absorbs light energy for photosynthesis.

• Chlorophyll releases oxygen during photosynthesis.

What is the primary function of the Calvin cycle?

• To convert carbon dioxide into glucose.

• To produce oxygen from sunlight.

• To break down glucose for energy.

• To store carbon dioxide in the soil.

How does light intensity affect the rate of photosynthesis?

• Photosynthesis occurs only in complete darkness.

• Higher light intensity always decreases the rate of photosynthesis.

• Light intensity has no effect on photosynthesis.

• Light intensity positively affects the rate of photosynthesis up to a saturation point.

What is the significance of water in the light-dependent reactions?

• Water is a byproduct of the light-independent reactions.

• Water acts as a storage medium for glucose in the light-dependent reactions.

• Water is essential for providing electrons and protons, and it produces oxygen during the light-dependent reactions.

• Water is only used for cooling the plant during photosynthesis.

What are the three main stages of the Calvin cycle?

• Glycolysis, Krebs cycle, oxidative phosphorylation

• Carbon fixation, reduction, regeneration of RuBP

• Light reaction, dark reaction, electron transport

• Photosynthesis, respiration, fermentation

How does temperature influence photosynthesis?

• Higher temperatures always increase photosynthesis rates.

• Temperature has no effect on photosynthesis.

• Temperature only affects the color of leaves.

• Temperature influences photosynthesis by affecting enzyme activity and the availability of reactants.

What is the role of NADPH in photosynthesis?

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

• NADPH transports oxygen to the chloroplasts.

• NADPH is a byproduct of the Calvin cycle.

• NADPH is used to absorb sunlight during photosynthesis.

What are the main factors that can limit photosynthesis?

• Soil pH levels

• Light intensity, carbon dioxide concentration, temperature, and water availability.

• Oxygen concentration

• Nutrient availability