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A scientist studies the growth of plants in a laboratory. Which experimental procedure would provide evidence that
plants need nitrogen to grow? (1 point)

Two plants are grown in pots of soil with different amounts of nitrogen. The plants have sufficient
water and sunlight. The scientist measures plant growth.

Seeds are planted in two identical pots of soil. Both pots are given adequate water and exposure to
sunlight. A plant grows in one pot. The scientist measures the nitrogen content of the soil

Identical plants are placed in two air-tight containers with sufficient exposure to sunlight. One
container has nitrogen gas, and the other has room air. The scientist measures plant growth

Seeds are planted in two terrariums. Both terrariums are given adequate water and exposure to
sunlight. A plant grows in one terrarium. The scientist measures the nitrogen content of the air.

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The experimental procedure would provide evidence that plants need

nitrogen to grow is by

  • Identical plants are placed in two air-tight containers with sufficient exposure to sunlight.
  • One container has nitrogen gas, and the other has room air. The scientist measures plant growth

It is necessary to use identical plants during the experiment as plants have

different rates of nitrogen absorption from the soil. It should also be done in

air-tight containers called terrariums to prevent loss or contamination of the

gases with other elements/compounds.

The identical plants containing nitrogen and room air should both be

measured for the growth difference between them.

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