Photosynthesis and Energy Flow Review

Which of these best describes what happens to the sugars made during photosynthesis? (choose 2)

• The sugars are released into the air.

• The sugars are used for energy.

• The sugars are used for growth.

Answer explanation

• -Some of the sugars made during photosynthesis are broken down to release usable energy.

-Some of the sugars made during photosynthesis become part of the organism itself, helping it to grow bigger.

-Oxygen is released into the air during photosynthesis, not sugars.

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NGSS.MS-LS1-6

NGSS.MS-LS1-7

Which of these are inputs to photosynthesis? (choose 2)

• sugars (glucose)

• oxygen

• water

• carbon dioxide

Answer explanation

Water and Carbon dioxide are inputs to photosynthesis.

Glucose (sugars) and oxygen are outputs to photosynthesis.

Tags

NGSS.MS-LS1-6

Choose the word or phrase that best completes the sentence.

In plants, photosynthesis occurs primarily in ______.

• root cells

• chlorophyll molecules

• chloroplasts

• mitochondria

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NGSS.MS-LS1-6

Which form of energy do plants capture in order to carry out photosynthesis?

• light energy

• chemical energy

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The diagram of the plant has arrows representing inputs and outputs of photosynthesis.

Which arrow best represents the movement of oxygen during photosynthesis?

• A

• B

• C

Answer explanation

Arrows A and B are pointing into the plant indicating they are inputs to photosynthesis.

Oxygen is an output of photosynthesis so moves from the plant to the air.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Three groups of students are going to carry out an experiment about photosynthesis. First, the students will submerge Elodea plants in a beaker of water mixed with baking soda (Figure 1). Then, they will place the beaker directly under a lamp.

With the lamp off, the students will count how many bubbles they see rise from the plants. After three minutes of observations, each group will record their results. Next, the students will turn on the lamp. For three minutes, they will again count and record the number of bubbles they see rise from the plants.

Based on what you know about photosynthesis, what do you predict will happen during the experiment?

Figure 1. Elodea plants submerged in a beaker of water mixed with baking soda.

• Fewer bubbles will be released when the light is on compared to when the light is off.

• About the same number of bubbles will be released whether the light is on or off.

• More bubbles will be released when the light is on compared to when the light is off.

Answer explanation

During the experiment, oxygen bubbles will be used to detect the rate of photosynthesis in the plants. When the light is turned on, the rate of photosynthesis will likely go up. This will produce more oxygen, so more bubbles will be visible.

Tags

NGSS.MS-LS1-6

Which image shows an organism that performs photosynthesis?

• 
• 
• 

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NGSS.MS-LS1-6

During and after photosynthesis, energy changes from one form to another in a series of steps.

Which step related to this energy transformation occurs first?

• Light energy is used to build sugars from carbon dioxide and water.

• Sugar molecules are rearranged, releasing chemical energy.

• Chlorophyll captures light energy.

Answer explanation

During photosynthesis, light energy is changed to chemical energy. The first step in this process occurs when chlorophyll captures light energy.

Tags

NGSS.MS-LS1-6

Which of these are outputs of cellular respiration? (choose 2)

• oxygen

• carbon dioxide

• water

• glucose

Tags

NGSS.MS-LS1-7

The diagram has arrows representing the inputs and outputs of cellular respiration.

Which letter best represents oxygen in the model of cellular respiration?

• A

• B

• C

Answer explanation

Oxygen and glucose are the inputs for cellular respiration. Glucose is already labeled so B must represent oxygen.