1What is a cell, and why is it called the structural and functional unit of life?
2Why did nobody know about cells before the seventeenth century?
3Why is a body built from billions of small cells rather than a few large ones?
4What is the difference between a unicellular and a multicellular organism, and what advantage does being multicellular give?
5What does semi-permeable mean, and why does the cell membrane need to be like that?
6Does a plant cell have a cell membrane? Explain carefully.
7Explain why a plant that has not been watered goes floppy, and why it stands up again after watering.
8Name four organelles and say what each one does.
9Arrange these from smallest to largest and give a plant example of each: organ, cell, organism, tissue.
10Looking at a diagram, how would you decide quickly whether it shows a plant cell or an animal cell?