Lecture #7 Water Cell

Question 1

How much water is lost for every CO2 molecule gained in a leaf

Answer 1

400 molecules

Question 2

What provides mechanical stability to maintain the morphology of the plant

Answer 2

Turgor pressure which is caused by the cell wall that allows plants to build up hydrostatic pressure’s

Question 3

What is transpiration

Answer 3

Loss of water through the leaves to the atmosphere

Question 4

What is cohesion

Answer 4

Mutual attraction of water molecules to each other causing them to come together

Question 5

What is adhesion

Answer 5

Attraction between a water molecule and I’m adjacent solid phase

Question 6

What is surface tension

Answer 6

water molecules are more attracted to each other than they are attracted to gas molecules

The energy required to increase surface area of a gas-liquid interface is known as surface tension (N/m)

Question 7

What is the wetting surface contact angle

Answer 7

<90 degrees

Question 8

Hydrogen bonds give water high tensile strength, how much negative pressure can it with stand

Answer 8

< -20MPa

Question 9

What is diffusion

Answer 9

spontaneous movement of molecules or atoms from high concentration to low concentration zones

leads to decreasing free energy or increasing entropy

Question 10

What happens when a turgid plant cell loses water?

Answer 10

cytoplasm shrinks away from cell wall

Question 11

Osmosis

Answer 11

The diffusion of water across a semi permeable membrane