Cells Topic

What Happens When a Cell Part is Removed?

This science revision note aims to help your child

– Understand the difference between the cell wall and cell membrane

– Predict and explain what happens when a cell part is removed.

 

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MUST-KNOW about cells:

1. Identify the different parts of a cell and their functions.

    • Cell wall
    • Cell membrane
    • Cytoplasm
    • Nucleus
    • Chloroplasts

 

2. Differentiate between plant and animal cells.

    • Plant cells have cell walls while animal cells do not have cell walls.
    • Chloroplasts are only found in cells that photosynthesise.

 

Structure of a typical animal cell



 

Structure of a typical plant cell

Have you remembered all the must-know science knowledge?

If you have done so, let’s try answering this question!

The diagram below shows cell Z. Initially, when John place cell Z into a mixture of substance X, substance X is unable to enter cell Z.

When John removes a part of cell Z and place the cell into substance X, substance X is able to enter cell. Identify the cell part that John removed that resulted in his observation. Explain your answer.

STEP 1

Identify the function of the cell part that John removed.

  • Function: Control substances entering and leaving the cell.

 

STEP 2

Identify the cell part that correspond to the identified function.

 

FINALLY, put your answer together

Identify the cell part that John removed that resulted in his observation. Explain your answer.

Answer: John removed the cell membrane. The cell membrane controls the substance entering and leaving the cell. Without the cell membrane, substance X is able to enter cell X.

 

Let’s try out another question!

 

Cell A was placed into a mixture of Substance P and Substance Q. After a few minutes, Cell A was observed under a microscope and only Substance P was found inside.

Scienceshifu - cells - substances entering the cell

Afterwards, Part X was removed from Cell A and Cell A was placed back into an identical mixture of Substance P and Substance Q.

Scienceshifu - cells - cell part removed

After a few minutes, Cell A was observed under a microscope again. Which substance(s) will be found inside Cell A now? Explain your answer. (2m)

 

STEP 1

Identify Part X that is removed.

Part X is the cell wall.

 

STEP 2

What is the function of Part X? Does it affect the movement of substances moving in and out of the cell?

The function of the cell wall is to support the cell and gives the cell its shape. It does not affect the movement of substances moving in and out of the cell.

 

STEP 3

Which part of Cell A controls the movement of substances in and out of the cell? Has this part been removed?

The cell membrane controls the movement of substances in and out of the cell and it is still present.

 

FINALLY, put your answer together

Question: Which substance(s) will be found inside Cell A now? Explain your answer. (2m)

Answer:

Only Substance P will be found inside Cell A.

The part that has been removed is the cell wall. (0.5m) The cell membrane is present. (0.5m) The cell membrane, not the cell wall, controls the movement of substances in and out of the cell. Hence, the cell membrane allows substance P to enter the cell but not substance Q. (1m)

 

Note: Compare the relevant functions of each cell part. That is the function of the movement of substances in and out of the cell.

 

 

Common mistakes

 

Wrong answer: Both Substance P and Q can enter Cell A. The cell wall has been removed, which allows all substances to enter the cell.

The cell wall does not control which substances can enter or leave the cell. Only the cell membrane can do so. Hence, removing the cell wall does not affect the substances able to enter the cell.

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Andy Ling

Guiding your child to be the master of science concepts

 

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