Active Transport, Diffusion And Osmosis

Question 1

Define diffusion

Answer 1

The movement of molecules from a region of higher concentration to a region of lower concentration

Question 2

Define osmisis

Answer 2

The net movement of water molecules from a region of lower solute concentration to a region of higher solute concentration

Question 3

Define Active Transport

Answer 3

The movement of particles across a cell membrane from a region of lower concentration to a region of higher concentration

Question 4

Which mode of transport in cells move against the concentration gradient?

Answer 4

Active transport

Question 5

What are special exchange surfaces

Answer 5

Cells adapted for the exchange of certain materials, having a very high surface area to volume ratio

Question 6

Name two special exchange surfaces in humans

Answer 6

Villi in small intestine
Alveoli in lungs

Question 7

Name two specialized exchange surfaces in plants?

Answer 7

Spongy mesophyll of a leaf
Root hair cells