Living Environment Review

A student placed a test tube containing elodea (an aquatic plant) and pond water 10 cm from a light source. He observed that the plant gave off bubbles of a gas and counted how many bubbles were released in one

minute. He moved the plant farther away from the light source to see if the distance from the source made a difference. The data table below shows his

results.

The gas that was being produced was most likely

• carbon dioxide as a product of the process of respiration

• carbon dioxide as a product of the process of photosynthesis

• oxygen as a product of the process of respiration

• oxygen as a product of the process of photosynthesis

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The graph below shows changes in dissolved oxygen in a pond in the summertime over a 24-hour period.  What is the most likely reason for the variation in the dissolved oxygen levels in the pond over the 24-hour period?

• The increased light during the day decreases the oxygen produced by photosynthesis.

• Photosynthesis produces more oxygen during the day than is used by respiration.

• Respiration is reduced at night, so the oxygen produced by photosynthesis increases.

• More producers are active at night, so the dissolved oxygen increases.

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NGSS.MS-LS1-6

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The diagram below represents a cycling of

materials. The substances represented by X and Y are

• X: Oxygen

  Y: Carbon Dioxide

• X: Glucose

  Y: Oxygen

• X: Carbon Dioxide

  Y: Oxygen

• X: Amino Acids

  Y: Carbon Dioxide

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NGSS.MS-LS1-6

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Which part of the plant is where photosynthesis takes place?

• roots

• stem

• leaves

• flowers

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NGSS.MS-LS1-6

Carbon dioxide enters a plant through the leaves' _____________.

• stomata

• stem

• roots

• chloroplast

What kind of sugar do plants create during photosynthesis?

• lactose

• sucrose

• fructose

• glucose

Tags

NGSS.MS-LS1-6

What is the ultimate source of energy for life on Earth?

• glucose

• sunlight

• ATP

• H2O

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NGSS.MS-LS1-6

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If carbon dioxide is completely removed from a plant’s environment, what would you expect to happen to the plant’s production of high-energy sugars (rate of photosynthesis)?

• Sugar production will likely increase.

• Sugars will not be produced.

• The rate of sugar production will decrease .

• Fewer sugars will be produced at first, but then the plant will recover.

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NGSS.MS-LS1-6

NGSS.MS-LS1-5

Plants do not usually need to eat other organisms because plants ___________________.

• do not need food energy to live.

• turn sunlight into food energy.

• get all their food energy from soil.

• keep food energy stored in their roots.

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NGSS.MS-LS1-6

Which of the following materials are direct products of photosynthesis?

• fats and starches

• oxygen and sugar

• proteins and amino acids

• carbon dioxide and water

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3