Natural Science 2 ESO. Marian Ruiz
What is the basic unit of life? Robert Hooke
was a great English
He used one of the first microscopes
to look more
closely at the living world.
Hooke came up with the name “cells” to describe tiny compartments he saw in a piece of cork
and after he outlined THE
All living things are made of cells. Cells are the basic units of structure and function in living things.
All cells are produced from existing cells.
How is a cell organised ? Cells are the structural and functional units of all living things. Genetic material
controls and regulates how cells work. This DNA contains the hereditary information that is passed from one cell to the daughter cell.
is the inside of a cell. It contains the organelles
covers the whole cell
What are the two basic types of cells?
The DNA is contained in a nucleus.
The DNA is loose in the cytoplasm.
Animals and plants are multicellular eukaryotic organisms.
Bacteria are unicellular prokaryotic organisms.
How do animal and plant cells differ?
Cell Wall Plant, Bacteria
• • • •
Outer layer Rigid & strong Made of cellulose Support
• • •
the thin layer that surrounds the cell. Protection Controls movement of materials in/out of cell
Controls cell activities Contains the hereditary material of the cell
The jellylike material where organelles are located .
Supports and protects cell organelles
• • •
Smooth without ribosomes Rough with embedded ribosomes Carries materials through cell
Cytoplasm All cells
Endoplasmic reticulum (ER) All cells
Site of cellular respiration
Largest organelle in plant cells Store large amounts of food or sugars in plants
Digests old cell parts
• • • •
Containing chlorophyll Uses energy from sun to make food (glucose) for the plant Process called photosynthesis Release oxygen
Package & export proteins from the cell.
Vacuole Plant cells have a single, large vacuole Animal cells have small vacuoles
Lysosome Plant - uncommon Animal - common
Cell Coloring Two of you work on the animal cell and the others work on the plant cell. Directions: Choose a color for each of the parts below and fill in the square with the color of your choice. Color the cell part to match. Cell Membrane
Directions: Paint each of the parts below and fill in the square with the indicated color. Color the cell part to match.
Briefly describe the function of the cell parts. 1. Cell membrane 2. Endoplasmic Reticulum 3. Ribosome 4. Nucleus 5. Lysosome 6. Nucleolus 7. Mitochondria 8. Nuclear Membrane 9. Vacuole
LANGUAGE HELP e.g. The Cell Membrane is the thin layer that surrounds the cell. Its function is protect and control movement of materials in/out of cell .
Differences between animal and plant cells Letâ€™s see what the most important differences between animal cells and plant cells are. Fill the following table (independent work):
TYPICAL PLANT EUKARYOTIC CELL Is it found in a plant cell?
TYPICAL ANIMAL EUKARYOTIC CELL Is it found in an animal cell?
When you have finish you can discuss your answers with the members of your group.
Then answer those questions in group : 1. What cell parts do Animal cells have that Plant cells do not have? 2. What cell parts do Plant cells have that Animal cells do not have? 3. Why do Plant cells have cell walls and Animal cells do not? 4. Why do you think Plant cells have bigger vacuoles than Animal cells?
Useful phrases for discussions
Asking about or for an opinion
What do you think about…? What’s your opinion about ...?
In my opinion… Giving your opinion I think…
Giving an explanation
The reason for this is ....
Agreeing with an opinion
Disagreeing with an opinion
I don’t think so.
LANGUAGE HELP e.g. - I think plant cells have cell walls whereas animal cells don’t. - I agree with you.