Upper Primary Science Cells Worksheet - Free Printable

Let’s go step by step to solve each part of the problem.

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Question 3: Study the diagram and label parts A, B, and C.

Looking at the cell diagram:

- A points to the large dark circle in the center → that’s the nucleus.
- B points to the outer boundary of the cell → that’s the cell membrane.
- C points to the jelly-like substance inside the cell where organelles float → that’s the cytoplasm.

So:
- A = Nucleus
- B = Cell membrane
- C = Cytoplasm

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(i) Is this an animal cell or plant cell? Explain your answer.

This is an animal cell.

Why? Because it does NOT have:
- a cell wall (plant cells have a rigid outer layer),
- chloroplasts (for photosynthesis),
- or a big central vacuole (plant cells usually have one large vacuole).

Also, animal cells often have irregular shapes like this one — not boxy like plant cells.

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(ii) State the function of B

B is the cell membrane.

Its job is to:
- Control what goes in and out of the cell (like a gatekeeper).
- Protect the inside of the cell.
- Help the cell communicate with other cells.

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(iii) Explain why C is important to the survival of a cell.

C is the cytoplasm.

It’s important because:
- It holds all the organelles in place so they can do their jobs.
- Many chemical reactions happen here (like making energy or building proteins).
- It helps move materials around inside the cell.

Without cytoplasm, the cell’s parts would float away or not work properly — the cell couldn’t survive.

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Question 4(i): How many cells will there be if there are 4 parent cells and 2 times of cell division? Explain your answer.

Cell division means one cell splits into two.

If you start with 1 cell and divide once → 2 cells
Divide again → 4 cells
So after 2 divisions, 1 cell becomes 4 cells.

But here we start with 4 parent cells.

Each parent cell divides twice:

After 1st division: 4 cells × 2 = 8 cells
After 2nd division: 8 cells × 2 = 16 cells

OR think of it as: each cell doubles every time.

So: 4 → 8 → 16

Answer: 16 cells

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Question 5: Study the diagram below (it shows a sperm cell).

The diagram labels: tail (flagellum), nucleus, cell membrane, mitochondria.

(i) Is the organism an animal or plant cell? Explain your answer.

This is an animal cell.

Why?
- It has a tail (flagellum) for swimming — only animal cells (like sperm) have this.
- Plant cells don’t move on their own and never have tails.
- Also, no cell wall or chloroplasts shown — which plant cells always have.

Sperm cells are made by animals (including humans) to help make babies — plants use pollen instead.

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Final Answer:

3)
A: Nucleus
B: Cell membrane
C: Cytoplasm

(i) Animal cell — because it lacks a cell wall, chloroplasts, and large central vacuole; also has irregular shape.
(ii) Function of B (cell membrane): Controls what enters and exits the cell; protects the cell.
(iii) C (cytoplasm) is important because it holds organelles in place, allows chemical reactions to happen, and helps transport materials inside the cell.

4(i) 16 cells — because each of the 4 parent cells divides twice: 4 → 8 → 16.

5(i) Animal cell — because it has a tail (flagellum) for movement, and no cell wall or chloroplasts; sperm cells are only found in animals.