Both kinds have a membrane, a nucleus, mitochondria and cytoplasm. The basic machinery is the same.
Step 1: Something to Notice
Watch first. The explanation comes later.
A wilted plant recovers within an hour of watering and stands up straight again. No animal does anything comparable.
What is holding a plant up, if it has no skeleton?
Step 2: Find Out
Compare the shapes of a plant specimen and an animal one.
Step 1 — Predict
Why are plant cells box-shaped and animal cells rounded?
Choose what you think will happen. You cannot see the experiment until you do — guessing first is what makes it worth watching.
Step 3: So Here Is Why
Now the explanation, after you have seen it happen.
Plants have a cell wall
A rigid layer outside the membrane. It gives the cell a fixed shape and something for pressure to push against.
Cell wall A rigid layer outside a plant cell’s membrane.
And chloroplasts
They capture light to make food. Only cells that get light have them — root cells do not.
Chloroplast The part of a plant cell that captures light to make food.
And a large vacuole
A water store that swells and presses against the wall, making the cell stiff. Wilting is that pressure dropping.
The differences follow from the way of life
Plant cells have a rigid wall for support, chloroplasts for making food, and a large vacuole for water storage. Each corresponds to something plants do that animals do not.
What they share is more striking
Both have a membrane, cytoplasm, nucleus, mitochondria and ribosomes. The shared machinery is evidence of common ancestry, and it is why the same drugs can affect both.
Step 4: A Common Mistake
Lots of people think
“Every plant cell has chloroplasts, because plants are green.”
Step 5: Root Cells Have No Chloroplasts
The same idea somewhere new.
Chloroplasts capture light, and there is none underground, so a root cell carrying them would be maintaining a machine it can never use. Plant cells hold what their particular job needs — the same principle as a muscle cell stocking mitochondria, applied in the other direction.
Step 6: Think It Through
Practice makes it stick.
The Wilted Plant
Problem 1 of 2
A plant droops and then stands up after watering. What changed inside its cells?
Underground
Problem 2 of 2
Do root cells have chloroplasts?
Two Kinds of Cell
1 of 4
Which parts do plant cells have that animal cells do not?
2 of 4
Why are plant cells box-shaped?
3 of 4
What is wilting?
4 of 4
Why does a root cell lack chloroplasts?
Step 7: Quick Check
Show what you know.
Question 1 of 1
What holds a plant up without a skeleton?
Step 8: Explain It in Writing
Claim, evidence, then reasoning.
The question
Explain how a wilted plant stands back up after watering, and why an animal cannot do the same.
Words to usecell wallvacuolewaterpressurestiffskeletonrigid
Fill in all three boxes. The reasoning box is the one that matters most.
What You Found Out
- Both kinds share membrane, nucleus, mitochondria and cytoplasm.
- Plant cells add a rigid wall, chloroplasts and a large vacuole.
- Water pressure against the wall makes cells stiff; losing it is wilting.
- Root cells have no chloroplasts, because underground there is no light to capture.