Year 8 Science · Unit 1 · Lesson 5
Challenge Worksheet
Learning Goals
Find the mistake
A student wrote this answer
"Living things are made up of cells, and cells join together to make organs. Organs then combine to form tissues, which carry out specific jobs like digestion or circulation. In plants, the vascular system includes the xylem, which carries sugars made in the leaves down to the roots, and the phloem, which carries water upward from the roots to the leaves. Because plants have roots, stems and leaves, they are not really living systems, they are just collections of separate parts with different jobs."
1. This paragraph contains four scientific errors. List each error you can find. (Hint: check the order of organisation levels, what xylem and phloem each carry, and the conclusion about plants.)
2. Rewrite the paragraph correctly. Every sentence that contains an error must be fixed.
3. Explain why mixing up the order "cells → tissues → organs → organ systems" is a meaningful scientific error, not just a minor slip. What does the correct order tell us about how living things are built?
4. The student's paragraph claims plants are "just collections of separate parts." Using specific examples from the unit (e.g. xylem, root hair cells, stomata), write two sentences that disprove this claim by showing how plant parts interact as a system.
Wrap Up
In one sentence, what was the main idea of this lesson?