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A Growing Station for the Zoo

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A Growing Station for the Zoo

Use plant tests to judge designs for a lettuce-growing station.

Study the Zoo's Test

Read the test notes. Use the notes and graph to answer the questions.

Lettuce for the Tortoises

A zoo keeper wants a growing station for lettuce that the tortoises can eat. Before building it, the keeper tests three tray designs for 14 days. Each tray holds three young lettuce plants. The plants start about the same size, with the same number of leaves. They have the same kinds of pots and soil.

Tray A gets sunlight and water. Tray B gets no sunlight but gets the same measured amount of water as A each day. Tray C gets sunlight beside A but gets no water. The keeper checks that all three places have the same room temperature and enough air.

The keeper counts each plant's leaves at the start. At the end, the keeper counts how many new leaves have grown. The graph shows the total new leaves for the three plants in each tray. Leaves that were there at the start are not included.

New Leaves in 14 Days024681012Tray ATray BTray CTest trayTotal new leaves
1.
Which claim about the plants is supported by the graph?
Question 1 options
2.
Why did the keeper use plants that started about the same size?
Question 2 options
3.

How many more new leaves grew in Tray A than in Tray B? new leaves

4.
Which pair lets the keeper test water while keeping sunlight the same?
Question 4 options
5.
Sort the claims. Decide whether the graph gives evidence for each claim.

Judge Growing-Station Designs

Use the tray test as evidence. Choose designs that could help the lettuce keep growing new leaves.

6.
Which design does the test give the keeper the best reason to choose?
Question 6 options
7.
One design puts plants by a sunny window, but no one is assigned to water them. Which change best addresses the missing plant need?
Question 7 options
8.
The keeper will test two watering plans. Circle the TWO choices that help make this a fair test of water.

9.
The keeper repeats the test with new plants. This time, Tray B gets sunlight as well as water. Based on the first test, what is the best prediction?
Question 9 options

Check the Keeper's Next Plan

Look for fair tests and careful measurements. Use evidence when you explain a design choice.

10.
A helper wants to test only sunlight. The helper gives one group sunlight and water. The other group gets neither. What is wrong with this plan?
Question 10 options
11.
In a new test, a tray starts with 12 leaves altogether. It ends with 24 leaves. None of the starting leaves fall off. A helper records 24 NEW leaves.

Fix the helper's count. How many leaves are new? new leaves

12.
A helper says, “Every sunny, watered tray will grow exactly 12 new leaves in 14 days.” Which reply is best?
Question 12 options
13.
The keeper must choose between a sunny, watered shelf and a dark, watered shelf. Which design would you choose for growing new leaves? Use numbers from two trays to explain.