Year 8 Science · Unit 1 · Lesson 2
Challenge Worksheet
Learning Goals
Find the mistake
A student wrote this answer
"Plant cells are basically like animal cells but with some extra parts added on. Chloroplasts do the same job as mitochondria, they both produce energy for the cell to use. The cell wall is just a thicker version of the cell membrane, so it does the same thing. Really, a plant cell is just an upgraded animal cell with a few bonus features."
1. Identify two scientific mistakes in the student's answer. State each one clearly.
2. Write a corrected version of the sentence about chloroplasts and mitochondria. Your answer must name the correct energy source for each organelle.
3. Explain why it is important to describe the cell wall and the cell membrane as having different functions, not the same function. What would be lost from a plant cell if it had only a cell membrane and no cell wall?
1. Epithelial tissue lines and covers surfaces in animals (e.g. the lining of the intestine). Explain how the structure of epithelial tissue, flat cells packed closely together, suits its function of forming a barrier.
2. Both the heart (animal organ) and a leaf (plant organ) contain different types of tissue working together. Identify one tissue type in each organ and explain what it contributes to the organ's overall function.
Wrap Up
In one sentence, what was the main idea of this lesson?