Understanding Photosynthesis Process

What is the primary source of energy for almost all living things?

• Water

• The Sun

• Oxygen

• Glucose

Answer explanation

The primary source of energy for almost all living things is the Sun. It drives photosynthesis in plants, which produce glucose, the energy source for many organisms, making the Sun essential for life on Earth.

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What is the role of chlorophyll in photosynthesis?

• It absorbs water

• It captures and stores light energy

• It releases oxygen

• It combines with glucose

Answer explanation

Chlorophyll plays a crucial role in photosynthesis by capturing and storing light energy from the sun, which is essential for converting carbon dioxide and water into glucose and oxygen.

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Which organelle is responsible for photosynthesis in plant cells?

• Mitochondria

• Nucleus

• Chloroplast

• Ribosome

Answer explanation

The chloroplast is the organelle in plant cells responsible for photosynthesis, converting sunlight into energy. Mitochondria generate energy, the nucleus contains genetic material, and ribosomes synthesize proteins.

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What are the reactants in the photosynthesis process?

• Glucose and Oxygen

• Carbon Dioxide and Water

• Oxygen and Water

• Glucose and Carbon Dioxide

Answer explanation

In photosynthesis, plants use carbon dioxide and water as reactants to produce glucose and oxygen. Therefore, the correct answer is carbon dioxide and water.

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Explain the role of stomata in the process of photosynthesis.

• They absorb sunlight

• They allow the exchange of gases

• They store glucose

• They transport water

Answer explanation

Stomata are small openings on leaves that facilitate gas exchange. During photosynthesis, they allow carbon dioxide to enter and oxygen to exit, which is essential for the process to occur effectively.

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What is the chemical equation for photosynthesis?

Answer explanation

The correct equation for photosynthesis is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. This shows that carbon dioxide and water are converted into glucose and oxygen using sunlight.

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Describe how plants store excess glucose produced during photosynthesis.

• As proteins

• As starch

• As fats

• As oxygen

Answer explanation

Plants store excess glucose produced during photosynthesis primarily as starch. Starch serves as a compact energy reserve that can be broken down into glucose when needed, unlike proteins or fats, which serve different functions.

What is the significance of the chloroplast in the photosynthesis process?

• It provides structural support to the plant

• It is where light energy is converted into chemical energy

• It stores water for the plant

• It releases carbon dioxide

Answer explanation

The chloroplast is crucial in photosynthesis as it is the site where light energy is converted into chemical energy, specifically in the form of glucose, which fuels plant growth and metabolism.

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Identify the products of the photosynthesis process.

• Water and Carbon Dioxide

• Glucose and Oxygen

• Oxygen and Water

• Glucose and Carbon Dioxide

Answer explanation

Photosynthesis converts carbon dioxide and water into glucose and oxygen using sunlight. Thus, the correct products of this process are glucose and oxygen.

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How do plants use the glucose produced in photosynthesis?

• They convert it into oxygen

• They use it immediately for energy

• They store it as starch for later use

• They release it into the atmosphere

Answer explanation

Plants use glucose produced in photosynthesis primarily by storing it as starch for later use. This allows them to have a reserve of energy when needed, rather than using it all immediately.

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