The world of microscopes and cells

Question 1

What does “ER” stand for?

Answer 1

Endoplasmic reticulum

Question 2

What is the vacuole?

Answer 2

Contains the cell sap and supports the cell

Question 3

What is an organelle?

Answer 3

Membrane - bound substructure of a cell

Question 4

What is the purpose of the mitochondria?

Answer 4

Produce the energy for the cell - energy producing organelle

Question 5

What happens in the chloroplast?

Answer 5

Where photosynthesis takes place, chloroplast also contains a pigment called chlorophyll which is what make s the plants green in colour

Question 6

How is the onion cell and the plant cell similar?

Answer 6

Both have vacuole, similar shape, both have cytoplasm

Question 7

How is the onion cell and the plant cell different?

Answer 7

Onions have no chloroplast but plant cells do because the y are green plants

Question 8

List the organelles of the plant cell that is also found on the animal cell.

Answer 8

Cytoplasm
Nucleus
Membrane
Mitochondria

Question 9

List the similarities of the plant cell and the animal cell

Answer 9

BOTH HAVE 
A cell membrane
Cytoplasm present
Has nucleus
Mitochondrion present

Question 10

List the differences between the plant cell and the animal cell

Answer 10

PLANT CELL
Has cell wall
Has vacuole
Has chloroplast

ANIMAL CELL
No cell wall
No vacuole
No chloroplast

Question 11

Give the different objective lenses

Answer 11

X4
X10
X40

Question 12

What is the function of the base? (In a microscope)

Answer 12

Rests on the working surface and supports microscope

Question 13

What is the function of the arm?

Answer 13

The backbone of the microscope

Question 14

What is the function of the eyepiece?

Answer 14

The lens we look through to study the specieman

Question 15

What is the purpose of the optical tube?

Answer 15

Link the two lenses

Question 16

What is the light source?

Answer 16

A microscope must have a source of light. Some light sources are built in the microscope itself

Question 17

What is the stage?

Answer 17

Area where the slide is viewed from

Question 18

Stage clips are used for?

Answer 18

Holding down the slide

Question 19

What is a diaphragm?

Answer 19

Adjusts the amount of light

Question 20

Course adjustment screw is used for?

Answer 20

Focusing on specimen when SMALLEST OBJECTIVE LENS IS USED

Question 21

Fine adjustment screw is used for?

Answer 21

Focusing on the specimen when the other lenses are used

Question 22

How do you use a microscope?

Answer 22

STEP 1: Turn on the light

STEP 2: Make sure the lowest lens is in place. Place slide on centre of the stage

STEP 3: Clip the slide in place

STEP 4: Look through optic tube with coarse screw to get the best view of specimen

STEP 5: Use fine screw to get a sharper image

STEP 6: When viewing at higher magnification, use x10 lens to view with fine adjustment screw.

Question 23

How do you prepare a wet mount?

Answer 23

1. Make sure slide and coverslip are clean
2. Place large drop of water in centre of slide
3. Put specimen over droplet
4. Carefully at a 45* angle place the cover slip over specimen
5. Try not to get any air bubbles, if there are air bubbles you may have used too much water or specimen is too thick or it was folded.
6. Wipe any excess water away and make sure the slide is dry

Question 24

List the characteristics of a good slide

Answer 24

Clean and dry
No air bubbles
Specimen not folded
Specimen is in the centre of the slide
Specimen is not too large or thick

Question 25

What are the possibilities for air bubbles?

Answer 25

Specimen is too big Specimen is folded Too little water used