Photosynthesis & Respiration Review

A scientist is investigating the effect of light intensity on the rate of photosynthesis in the hydrilla plant. Which conclusion is supported by the results of the experiment?

• The rate of photosynthesis in a hydrilla plant decreases as light intensity increases beyond a certain point.

• The rate of photosynthesis in a hydrilla plant is directly proportional to the light intensity up to a certain level.

• The rate of photosynthesis in a hydrilla plant is unaffected by changes in light intensity.

• The rate of photosynthesis in a hydrilla plant is highest at low light intensities.

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NGSS.MS-LS1-6

During photosynthesis, which compound is primarily formed as a result of converting light energy into chemical energy?

• Oxygen

• Glucose

• Nitrogen

• Chlorophyll

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NGSS.MS-LS1-6

What conclusion can be drawn from the data in the diagram regarding gas exchange in a pond over a 24-hour cycle?

• The concentration of O₂ will decrease during the day due to increased cellular respiration.

• The concentration of CO₂ will increase during the day as a result of increased photosynthesis.

• The concentration of O₂ will increase during the day due to increased photosynthesis.

• The concentration of CO₂ will decrease during the night due to increased fermentation.

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NGSS.MS-LS1-6

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What is the balanced chemical equation for the process of photosynthesis?

• 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂

• 6O₂ + 6H₂O → C₆H₁₂O₆ + 6CO₂

• CO₂ + H₂O + light energy → C₆H₁₂O₆ + O₂

• O₂ + H₂O + light energy → C₆H₁₂O₆ + CO₂

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NGSS.MS-LS1-6

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What is the role of photosynthesis in the conversion of matter in plants?

• Photosynthesis transforms sunlight into carbon dioxide by breaking down sugar.

• Photosynthesis uses sunlight to convert carbon dioxide and water into glucose and oxygen.

• Photosynthesis changes oxygen into water using energy from the Sun.

• Photosynthesis turns sunlight into sugar by breaking down oxygen.

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NGSS.MS-LS1-6

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What relationship between photosynthesis and cellular respiration is depicted in the diagram?

• Photosynthesis generates oxygen used in cellular respiration

• Cellular respiration produces sunlight for photosynthesis

• Photosynthesis releases glucose that is used in cellular respiration

• Cellular respiration creates water for photosynthesis

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NGSS.MS-LS1-6

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What is the primary purpose of cellular respiration in cells?

• To generate oxygen for cellular processes.

• To convert glucose into a form of energy that cells can use.

• To store energy in the form of glucose.

• To produce carbon dioxide as a waste product.

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How does the process of photosynthesis demonstrate the principle of conservation of mass?

• The energy from sunlight is stored in the chemical bonds of glucose.

• The mass of the reactants, carbon dioxide and water, is equal to the mass of the products, glucose and oxygen.

• Photosynthesis converts solar energy into chemical energy without any loss of mass.

• The mass of the plant remains constant because it absorbs sunlight.

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What effect does large-scale logging have on the concentration of carbon dioxide in the atmosphere?

• It will decrease due to enhanced plant growth.

• It will increase due to reduced carbon absorption.

• It will remain unchanged as carbon cycles naturally.

• It will decrease because of increased soil carbon storage.

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In which part of the plant cell does photosynthesis take place?

• Nucleus

• Mitochondria

• Chloroplast

• Ribosome

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