A scientist studies the growth of plants in a laboratory. Which experimental procedure would provide evidence that plants need nitrogen to grow?(1 point)
Responses
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.
Identical plants are placed in two airtight containers with sufficient exposure to sunlight. One container has nitrogen gas, and the other has room air. The scientist measures plant growth.
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.