Cell Theory & Discovering Cells — Drills · Grade 7 Science
Chapter: Cells, Transport & Cellular EnergyWhat these drills covers
By the end of Cell Theory & Discovering Cells you should be able to:
- I can explain cell theory & discovering cells.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice, numeric and written answer, each with a worked explanation.
Vocabulary used: cell, cell theory, unicellular, multicellular, cell division.
Problem 1
Which fits cell theory?
- Every cell has chloroplasts
- All organisms contain many cells
- New cells arise from existing cells
- Every living cell has an enclosed nucleus
Answer and explanation
New cells arise from existing cells
Cell theory includes cells arising from existing cells; the other statements are not universal.
Problem 2
Starting with two cells, each divides once and then each resulting cell divides once. How many cells result?
Answer and explanation
8 cells
Two becomes four, then eight, assuming every stipulated division occurs.
Problem 3
Does cell theory require every organism to have many cells?
Answer and explanation
No. A single cell can be an organism; many organisms contain multiple cells.
Problem 4
What other information is needed to infer mass from cell count?
Answer and explanation
Cell sizes and composition matter. More cells do not supply a complete mass measurement by themselves.