Bio.2e: Energy Flow

Which organelle in plant cells is primarily responsible for carrying out photosynthesis?

• Mitochondria

• Chloroplast

• Nucleus

• Ribosome

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VA.BIO.2.e.

What is the main product of cellular respiration that provides energy for cellular activities?

• Oxygen

• Glucose

• ATP

• Carbon dioxide

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VA.BIO.2.e.

Which gas is taken in by plants during photosynthesis?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

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During photosynthesis, what is the source of energy that drives the process?

• Chemical energy from glucose

• Heat energy from the soil

• Light energy from the sun

• Mechanical energy from wind

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VA.BIO.2.e.

Which of the following best describes the relationship between photosynthesis and respiration in terms of energy flow?

• Both processes release energy

• Photosynthesis stores energy, respiration releases energy

• Both processes store energy

• Respiration stores energy, photosynthesis releases energy

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VA.BIO.2.e.

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Why do plants need both photosynthesis and respiration to survive?

• Photosynthesis provides oxygen, respiration provides carbon dioxide

• Photosynthesis stores energy, respiration releases stored energy for cellular work

• Both processes produce glucose

• Respiration stores energy, photosynthesis releases energy

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VA.BIO.2.e.

A student sets up an experiment to measure the rate of photosynthesis in aquatic plants by counting oxygen bubbles produced under different light intensities. What is the independent variable in this experiment?

• Number of oxygen bubbles

• Type of aquatic plant

• Light intensity

• Amount of water

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A scientist observes that when the temperature increases, the rate of cellular respiration in yeast also increases up to a certain point, then decreases. What reasoning best explains this observation?

• Enzymes involved in respiration work faster at higher temperatures, but denature if it gets too hot

• Yeast cells produce more glucose at higher temperatures

• Oxygen is only available at higher temperatures

• Respiration does not depend on temperature

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A student claims that plants do not need to perform cellular respiration because they make their own food through photosynthesis. Use evidence to support or refute this claim.

• Refute: Plants need cellular respiration to convert glucose into usable energy (ATP) for cellular processes

• Support: Photosynthesis provides all the energy plants need, so respiration is unnecessary

• Refute: Plants only perform respiration at night

• Support: Respiration is only needed in animals

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VA.BIO.2.e.