B1

Question 1

How many micrometers in 1mm

Answer 1

1,000

Question 2

What is the difference between an electron and a light microscope

Answer 2

Electron microscope has higher magnification and resolution

Question 3

What is the equation for magnification

Answer 3

Size of image/size of real object

Question 4

How many nanometers (nm) in 1mm

Answer 4

1,000,000

Question 5

What is the function of the root hair cell

Answer 5

To make up substances form the soil

Question 6

Describe the structure of the root cell and how it helps

Answer 6

Has elongated hairs that stick out from the soil, these hairs give the roots a large surface area for absorbing substances

Question 7

State 4 features of an effective gas exchange surface in an animal

Answer 7

1. Large surface area
2. Thin membrane
3. Efficient blood supply
4. Being ventilated

Question 8

By which process are gases moved across the membrane

Answer 8

Diffusion

Question 9

Which feature of the lungs gives a short diffusion pathway

Answer 9

Walls of alveoli are thin

Question 10

State which feature of the lungs gives a lathe surface area

Answer 10

Lots of alveoli

Question 11

Why would a person with emphysema suffer from lower energy levels during physical exercise

Answer 11

As walls of alveoli are broken down the surface area in the lungs is reduced so the amount of oxygen that can diffuse into the blood at any one time is reduced this means that their body cells are not getting enough oxygen for respiration during exercise resulting in lower energy levels

Question 12

Describe the movement of gases into and out of the leaf

Answer 12

Carbon dioxide diffuses into the leaf, water vapour diffuses out of the leaf and oxygen diffuses out of the leaf

Question 13

What is the purpose of air spaces in the leaf

Answer 13

Increase surface area for carbon dioxide to diffuse into the cells