What Plants Need to Grow

Question 1

Ms. Lee wants to find out whether plants need both sunlight and water to grow. Which of the following experimental plans would let her determine the answer?

Accepted Answer

Set up four groups of identical seedlings: (1) sunlight and water, (2) sunlight only, (3) water only, and (4) neither sunlight nor water.

Answer

Give some seedlings only sunlight and some seedlings only water, then see which group grows taller.

Answer

Give all seedlings both sunlight and water, then compare their growth to seedlings that get no water but the same amount of sunlight.

Answer

Give all seedlings only sunlight and no water, and observe whether they grow.

Question 2

Which of the following investigation plans would best allow a second‑grade scientist to find out whether plants need sunlight, water, or both to grow?

Accepted Answer

Set up three groups of identical seeds: Group 1 receives both sunlight and water; Group 2 receives sunlight but no water; Group 3 receives water but no sunlight. Observe the height of each plant after two weeks.

Answer

Plant identical seeds in soil, give none of the pots water or sunlight. Observe the height after two weeks.

Answer

Plant identical seeds in soil, give all of them sunlight, and water only half of the pots. Observe the height after two weeks.

Answer

Plant identical seeds in soil, give all of them water, and place half of the pots in sunlight and half in darkness. Observe the height after two weeks.

Question 3

Which three things does a healthy plant need to grow?

Accepted Answer

water, light, suitable temperature

Answer

light, water, fertilizer

Answer

water, soil, wind

Answer

soil, light, suitable temperature

Try three questions

Ms. Lee wants to find out whether plants need both sunlight and water to grow. Which of the following experimental plans would let her determine the answer?

Which of the following investigation plans would best allow a second‑grade scientist to find out whether plants need sunlight, water, or both to grow?

Which three things does a healthy plant need to grow?

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