cellslesson1.pptxxxxxxxxxxxxxxxxxxxxxxxx

cells lesson 1

1. Cells – lesson 1 Target – to know how to use a microscope and what plant and animal cells contain.

2. Using a microscope 1. Eyepiece 3. Focus adjustor 2. Arm 4. Base 5. Mirror 6. Stage 7. Lenses

3. Diagram of a microscope

4. Microscope experiment Follow the instructions on the sheet and set up the microscope to look at the cells in an onion. Draw a diagram of what you see. Questions – page 8 – KS3 Science 1

5. Answers 1. Magnification is how many times larger an image is compared to the object. 2. Sunlight will burn the retina of the eye and blind a person. 3.Two lenses are used in a microscope. 4. (a) 10x20 = 200 (b) 10x40 = 400 5. Objective lens is changed to change the magnification.

6. Section through an Animal Cell A jelly-like fluid that fills the cell. Lots of chemical reactions occur here. 1. cytoplasm 2. cell membrane Controls what enters and leaves the cell. 3. nucleus Controls the reactions of the cell and how it grows and divides into new cells.

7. Section through a Plant Cell A jelly-like fluid that fills the cell. Lots of chemical reactions occur here. 1. cytoplasm 4. cell membrane Controls what enters and leaves the cell. 5. nucleus Controls the reactions of the cell and how it grows and divides into new cells. Captures light and make food by photosynthesis. 2. chloroplast Helps keep the shape of the cell. 3. cell wall 6. vacuole A space filled with water and nutrients.

8. 4) 1) 5) 6) 2) 3) Plant cells vs. Animal cells Both types of cell have these: Only plant cells have these: Cell wall – provides support Large Vacuole – contains sap Chloroplasts – contain chlorophyll Cell Membrane – holds the cell together Cytoplasm - this is where the reactions happen Nucleus – The “brain” of the cell

9. What is this? What is this? What is this? What is this? What is this? What is this? Nucleus Cytoplasm Cell membrane Vacuole Cell wall Chloroplast Nucleus Cell membrane Vacuole Chloroplast Cytoplasm Cell wall Controls the reactions of the cell and how it grows and divides into new cells. Controls what enters and leaves the cell. Found only in plant cells. A space filled with water and nutrients. Found only in plant cells. Captures light and make food by photosynthesis. A jelly-like fluid in which all the cell's reactions occur. Found only in plant cells. Helps keep the shape of the cell.