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9 T Cells

We are working with Cambridge Assessment International Education towards endorsement of this title. The document discusses plant cells and their key components. It provides a labeled diagram of a typical plant cell from a leaf, highlighting structures like the cell wall, cell membrane, chloroplasts, mitochondria, nucleus, cytoplasm, and vacuole. The cell wall provides structure and holds the cell's shape. The cell membrane controls what enters and exits the cell. Chloroplasts contain chlorophyll and are where plants perform photosynthesis.

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Roseann okafor
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219 views1 page

9 T Cells

We are working with Cambridge Assessment International Education towards endorsement of this title. The document discusses plant cells and their key components. It provides a labeled diagram of a typical plant cell from a leaf, highlighting structures like the cell wall, cell membrane, chloroplasts, mitochondria, nucleus, cytoplasm, and vacuole. The cell wall provides structure and holds the cell's shape. The cell membrane controls what enters and exits the cell. Chloroplasts contain chlorophyll and are where plants perform photosynthesis.

Uploaded by

Roseann okafor
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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We are working with Cambridge Assessment International Education towards endorsement of this title.

1 Cells

Cells
If you study a plant by observing part of it
through a microscope, you will see that it
is made up of a very large number of tiny
‘boxes’. These are called cells. All living
organisms are made of cells.
Cells are so small that you cannot see them
with your eyes alone. The photograph of the
plant cells was taken through a microscope.

E
one cell
The microscope magnifies the view of the
cells, so that they look much bigger than they
really are. Part of a leaf seen through a microscope

Parts of a plant cell


The diagram shows a plant cell from a leaf.
cell wall
Every plant cell has a cell wall. The cell wall is
strong and stiff. It holds the plant cell in
shape. Plant cell walls are made of a substance
called cellulose.

cell membrane
PL sap vacuole
This is a large, fluid-filled space inside
a plant cell. The liquid inside it is a
solution of sugars and other substances
dissolved in water. The solution is
called cell sap.
M
All cells have a cell membrane. The cell
membrane is very thin and flexible. It is like chloroplast
the thin skin of a soap bubble. It lies along the Plant cells that are in the sunlight often
inner edge of the cell wall. The cell membrane contain chloroplasts. This is where
controls what goes in and out of the cell. plants make their food. Chloroplasts
look green because they contain a
green substance called chlorophyll.
cytoplasm
SA

All cells have cytoplasm. Cytoplasm is like clear


jelly. Chemical reactions happen inside the
cytoplasm. These reactions keep the cell alive.
mitochondrion
All plant cells have mitochondria
nucleus (singular: mitochondrion). Inside
Most cells have a nucleus. The nucleus controls mitochondria, energy is released
the activities of the cell. from food.

Diagram of a leaf cell

Questions
1 Look at the photograph of the plant cells on this page. What do
you think the little green circles inside the cells are? Why are they
green? What happens inside them?
2 Describe four differences between a cell wall and a cell membrane.

2
Original material © Cambridge University Press 2020. This material is not final and is subject to further changes prior to publication.

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