B3 checklist

Question 1

What is the difference between diffusion and osmosis?

Answer 1

Osmosis is the movement of water from an area of high density to an area of low density across a partially permeable membrane.
Diffusion is the movement of particles from a low density to an area of high density

Question 2

why should a distance runner have a isotopic drink rather than coke?

Answer 2

A runner should have a isotopic drink because it contains more glucose and will hydrate him faster than coke.

Question 3

Why does active transport require energy?

Answer 3

Active transport requires energy because it is the movement of particles from a low density to a high destiny. Active transport moves against a concentration gradient and so needs energy to occur

Question 4

What 2 adaptations does villi have which help the small intestine to work?

Answer 4

1. Large surface area

2. Large supply of blood

Question 5

Identify the main parts of the breathing system & describe how pressure changes occur?

Answer 5

Parts:
1. lungs
2. diaphragm
3 .Intercostal muscles

Pressure changes:
When we breathe in intercostal muscles and diaphragm contract, volume increases and pressure decreases.
when we breathe out intercostal muscles and diaphragm relax, volume decreases and pressure increases

Question 6

Describe how the leaf is adapted for efficient exchange

Answer 6

Large surface area