Biology - Cells

Question 1

What are all living things made up of?

Answer 1

Cells

Question 2

What are cells?

Answer 2

Cells are the smallest units of living matter that exhibits the characteristics of life

Question 3

What is everything in a cell called?

Answer 3

Organelles

Question 4

What is the function of the cell membrane?

Answer 4

Controls what enters and leaves the cell

Question 5

What is the function of the cytoplasm?

Answer 5

A jelly-like fluid in which foods, minerals and salts are dissolved

Question 6

What’s the function of the nucleus?

Answer 6

It’s the brain, it controls the cells activities

Question 7

What is the function of the vacuoles

Answer 7

It stores food, water and waste

Question 8

What’s the function of the chloroplasts?

Answer 8

It contains chlorophyll which traps sunlight to make food (photosynthesis)

Question 9

What is the function of a cell wall?

Answer 9

It gives shape and support

Question 10

Give 4 differences between a plant cell and an animal cell

Answer 10

animal - no cell wall
plant - cell wall
animal - no chloroplasts 
plant - chloroplasts
animal - irregular shape
plant - regular shape 
animal - small, temporary vacuoles 
plant - large, permanent vacuoles

Question 11

What’s the function of the eye piece?

Answer 11

Look through to see image

Question 12

What is the function of the objective lens?

Answer 12

It magnifies the image

Question 13

What is the function of the stage?

Answer 13

Where the glass slide is placed

Question 14

What is the function of the focus knob?

Answer 14

It moves the objective lens up or down to see image more clearly

Question 15

What is the function of muscle cells?

Answer 15

It allows movement

Question 16

What is the function of nerve cells?

Answer 16

It carries messages

Question 17

What is the function of white blood cells?

Answer 17

It defends against diseases

Question 18

What is the function of red blood cells?

Answer 18

It carries oxygen

Question 19

What is a tissue and give an example of one

Answer 19

A group of similar cells with a special function eg, muscle

Question 20

What is an organ and give an example

Answer 20

It’s a group of different tissues that work together to carry out special functions eg, the heart

Question 21

What is a system and give an example

Answer 21

It’s a group of organs working together eg, the digestive system

Question 22

To examine onion bulb cells (plant) [experiment]

Answer 22

1- Using a forceps, pull a small piece of onion from the inside of the onion
2- Using a dropper, add 3 drops of water on a slide. Place the onion tissue flat on the water
3- Gently lower a cover slip onto a slide
4- Apply the iodine stain to the slide alongside the coverslip
5- Place some filter paper on the other side of the coverslip to draw the iodine across the cells
6- Examine the onion cells under low, medium and high power
7- Make a sketch of the onion cells at high power
Results - A clear image is seen of the cell wall, vacuole and nucleus. The Iodine stains the nucleus an orange/yellow colour.
Conclusion - The microscope can be used to see plant cells magnified.