Diffusion

Question 1

what is diffusion ?

Answer 1

diffusion is the net movement of particles from a region of their higher concentration to a region of their lower concentration

Question 2

what are the main factors that affect diffusion?

Answer 2

1.surface are
2.temperature
3.distamce
4.concentration gradient

Question 3

true or false
Cell membrane are completely permeable

Answer 3

False
cell membranes are partially permeable

Question 4

Which one increases the rate of diffusion: a steep concentration gradient or a gentle concentration gradient ?

Answer 4

steep concentration gradient

Question 5

Where does the energy for diffusion come from ?

Answer 5

The kinetic energy of random movement of molecules and ions .

Question 6

name three examples of diffusion in organisms and state whether the substance hat is diffusing is a gas or solute .

Answer 6

1. plants need CO2 for photosynthesis and the substance is a gas
   2.gaseous exchange for respiration in animals , namely O2 and CO2, the substance is gases
2. the absorption of nutrients through the small intestines , the solute is a solute

Question 7

Explain why diffusion increases , when the temperature is higher.

Answer 7

Diffusion works off kinetic energy , and when the temperature is increased so is the random movement of molecules in the diffusing substance