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Duckweed Choices at the Library Pond

Compare duckweed test results from two water temperatures and use evidence to explain how the environment can affect plant traits.

Grade 3ScienceInteractive · Printable

Aligned to3-LS3-2

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What’s included

Single worksheet
Auto-graded online
1 NGSS standard
Printable answer key
14 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 3
Subject: Science
Question types: Fill in the blank, Multiple choice, Matching, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

Students use investigation results to compare plant traits under different environmental conditions.
Students explain with evidence how water temperature can affect plant growth and leaf color.
Students judge a plant-care choice and suggest a follow-up test using controlled conditions.

How to use

Read the pond team's notes together, then have students use the graph and observations to judge the tray locations. Ask students to cite numbers in their explanations.

Curriculum

NGSS standard covered

3-LS3-2

Use evidence to explain that the environment can affect traits, such as a plant that gets too little water.

Preview

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Name Date

Duckweed Choices at the Library Pond

Use test evidence to judge how pond conditions affect plant traits.

A Test Behind the Library

Read the pond team's notes. Use the graph and records to answer the questions.

A Duckweed Tray Problem

A pond behind the library has small floating plants called duckweed. The library team wants to grow healthy duckweed in trays near the pond so visitors can observe it. The team needs to choose a water condition that helps the plants grow well.

The team placed matching duckweed plants in two trays. Each tray started with 8 fronds. The trays had the same pond water, water depth, lamp, and number of hours under the lamp. The team changed the water temperature. Tray C had water kept at 18 degrees Celsius. Tray W had water kept at 24 degrees Celsius. The team counted fronds and noted their color after 10 days.

After 10 days, Tray C had 16 fronds. Fourteen fronds were green, and 2 were pale. Tray W had 12 fronds. Seven fronds were green, and 5 were pale. The team recorded these results but wanted more evidence before making a final choice for the pond display.