Science
plant physiology

Question Description

I have a paper that needs to be answered. straight forward questions, won't take anytime ! that's it, the paper is related to botany of course

Final Answer

Attached.

Water Properties Quiz & Water Potential
Short Answer Questions:

1. Water is a liquid at room temperature. Explain why this is unusual and then explain why it
occurs.

The weak, small hydrogen bonds hold water molecules together in their vast numbers for
a small fraction of a second. Slowing them down and bringing them close together hence
the liquid form under room temperature.
2. Water is transparent to light. Explain why this is biologically important.
Light is a major component of photosynthesis, therefore, transparency of water allows
light to pass through. In the process it undergoes spectral composition through
attenuation and altering enhancing the richness of the light.
3. How does water affect the shape of molecules?
Water has three atoms with an angle of 104.5 degrees between bonds that makes it a bent
molecule. These makes water molecules polar allowing it to form hydrogen bonds,
having a high surface tension and a very good solvent.
Fill-in-the-Blank Question:
1

Negative Pressure potential Term for a negative pressure

2

Vapor

Air bubbles that escape from a liquid under reduced pressure

3

Bulk flow

Mass movement of molecules from one area to another
following a pressure gradient

4

Diffusion

Random movement of individual molecules from one area to
another

5

Collagen and fibronectin.

Integral proteins in the membrane that acts as a channel for
water passage

6

Capillary action

Movement of water up a thin tube

7

Water

Universal solvent

8

Solute

Substance dissolved in a solvent

1

Cohesion/Adhesion Matching: For each of the following, indicate if it is an example of cohesion
(C), adhesion (A), or both (B)
1

Cohesion

attraction of likes

2

Adhesion

attraction of unlikes

3

Cohesion

water molecules hydrogen bond to one another

4

Adhesion

water is absorbed by a paper towel

5

Cohesion and adhesion

water moves up a thin column

Calculation/Conversion Question: Megapascal is the metric unit for water potential. It is a
pressure unit. 1 MPa is approximately equal to 10 atmospheres or 10 bars or 147 pounds per
square inch. Convert the following.
1

Racing bicycle tire (120 psi) =

0.827371

MPa

2

Automobile tire (35 psi) =

0.241317

MPa

3

Typical plant cell pressure (0.5 MPa) =

4

Home plumbing pressure (30 psi) =

5

Water pressure under 15 feet (0.05 Mpa) =

72.51886887 psi
0.206842719 MPA
7.2518868867 psi

Water Property Matching: Match each of the following with the appropriate property of water.
a. Density decreases on crystallization

e. High surface tension

b. Heat of fusion

d. Specific Heat

c. Heat of vaporization

f. Tensile strength

1

d

explains why people perspire and plants transpire

2

f

explains why desert plants are succulents

3

e

explains why raindrops are round

4

e

explains why water acts like it has a skin

5

f

explains why water can move up a thin tube

6

a

ice floats

7

b

involved in cooling organisms

8

c

used by desperate farmers to protect fruit crops
from frost damage

9

b

thermal buffer

2

10

d

water is a thermal buffer

11

c

water resists evaporation

12

b

water resists freezing

13

c

water resists temperature changes

Diffusion, Osmosis & Water Potential Quiz
What is the water potential (Ψw) of a beaker of pure water 0 MPa Pressure potential? 0 MPa
Solute potential? Negative of Ps value (- X Mpa)

1.

Calculate the osmotic potential (Ψs) of a 2.4 molal sucrose solution at 24oC. Show your
work.

Ψs = -i...

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