Common misconceptions › Class 9 › Science › Cell: The Building Block of Life Class 9 Science · Chapter 2 · NCERT (iesc102)
Cell: The Building Block of Life: common misconceptions
See the tempting mistake students make in Cell: The Building Block of Life, why it feels right at first glance, and a worked visual example that shows the right idea.
Worked visual “If your child says…” (8) Teach & practice The tempting mistake & worked visual Do plant cells have cell membranes? Wrong
Plant cells have walls in place of membranes.
Why it feels right. A rigid wall looks like the only boundary.
Right
A plant cell has a membrane inside its wall.
Worked example
Before Salt solution The outer wall stays fixed. In concentrated salt solution the inner membrane and contents pull inward. In a suitable microscope demonstration, a plant cell in concentrated salt solution loses water. Its cell contents and membrane pull inward, and the wall remains in place. If your child says… (8 concept checks in this chapter)
As you work through Cell: The Building Block of Life , listen for these everyday misunderstandings and use the prompt alongside each one.
If your child says…
“A bigger image always shows more detail.”
Ask together Did enlargement separate details that were blurred together? What’s true Enlargement cannot separate details that were not resolved. If your child says…
“Cells dividing again and again must mean cancer.”
Ask together If signals control this new growth, must repeated division mean cancer? What’s true Repeated division can be healthy when signals regulate it. If your child says…
“Sugar solution makes water enter the strip.”
Ask together Which side has less water relative to sugar? What’s true Across these membranes, water moves overall towards the solution containing more dissolved sugar. If your child says…
“The cell wall shrinks when water leaves.”
Ask together Which boundary has moved inward in the right cell? What’s true The membrane retreats with the shrinking contents, while the rigid wall retains its outline. If your child says…
“The Golgi apparatus makes proteins.”
Ask together Where does the protein first appear along this route? What’s true Ribosomes make proteins before the Golgi apparatus receives them. If your child says…
“Without a nucleus, bacteria cannot have DNA.”
Ask together Which boundary still surrounds the bacterium's DNA? What’s true Bacterial DNA occupies a region called the nucleoid, without a surrounding nuclear membrane. If your child says…
“Every plastid is green.”
Ask together Would a colourless food store need green pigment to do its job? What’s true Some plastids store food or contain other colours instead of chlorophyll. If your child says…
“Each new skin cell gets half the chromosomes.”
Ask together How does each final mitosis cell's chromosome count compare with the starting cell's? What’s true Chromosomes are copied before mitosis, so each new cell receives a full set. Use this chapter three ways Previous chapter Exploration: Entering the World of Secondary Science Next chapter Tissues in Action
In the app, your child answers a short check-in with confidence taps, and you see which of these misunderstandings showed up—and which ones are gone.
Start free 
