Biological importance of water

Question 1

What percentage of water does an organism have ?

Answer 1

60-95%

Question 2

What is the structure of water?

Answer 2

2 hydrogen atoms

1 oxygen atom

Question 3

What bond do the atoms have?

Answer 3

Covalent

Question 4

What does oxygen have that pulls electrons ro it?

Answer 4

• Negative charge

- attraction to electrons more than hydrogen

Question 5

What are the changes of oxygen t hydrogen?

Answer 5

Oxygen: delta negative
Hydrogen: delta positive

Question 6

Because they’re both differently changed what does that make water?

Answer 6

Polar

Question 7

Because it has 2 differently charged regions what does it make

Answer 7

Dipolar

Question 8

What bonds does the structure have?

Answer 8

Hydrogen,

Question 9

What’s the strength of the bonds?

Answer 9

Weak

Question 10

What does the weak bonds make easier?

Answer 10

Other molecules bonding to another oxygen

Question 11

Summarise some properties of water

Answer 11

• Small
• polar
• hydrogen bonds

Question 12

What is the function in plants?

Answer 12

Sticks to xylem walls (adhension)

Question 13

Define adhesion.

Answer 13

Water substances sticking he other substances

Question 14

Define cohesion:

Answer 14

Water molecules stick to one another

Question 15

When does adhesion happen?

Answer 15

Water ordeals stick together like a string

Question 16

When does cohesion happen?

Answer 16

When evaporation happens at the leaf which pulls water upwards

Question 17

Benefits of water being polar

Answer 17

• Powerful solvent
• water can dissolve: polar molecules and ionic compounds
• used as solvent in processes

Question 18

What do the hydrogen bonds prevent?

Answer 18

Small molecules from vaporising into gas

Question 19

what do the ions allow?

Answer 19

Chemical reactions to happen within it

Question 20

What is high heat capacity?

Answer 20

Retains alot of heat

Question 21

What i high heat of evaporation?

Answer 21

Needs alot of energy to evaporate

Question 22

What does solvent mean?

Answer 22

Can dissolve substances

Question 23

Define dissolve

Answer 23

Be surrounded by water molecules

Question 24

Why can it be a solvent?

Answer 24

Because it’s both delta positive and negative

Question 25

What can it resist?

Answer 25

Temperature changes

Question 26

When is it important?

Answer 26

Fish that live n water

Question 27

What causes the high heart capacity?

Answer 27

Hydrogen bonds

Question 28

Where is the high surface tension and cohesion used?

Answer 28

Xylem

Question 29

What does reagent mean?

Answer 29

Can be used in chemical reactions

Question 30

When is it less dense?

Answer 30

4°c

Question 31

Which is less dense water or ice?

Answer 31

Ice

Question 32

What does warn water do?

Answer 32

Sink

Question 33

What does cold water do?

Answer 33

Rise

Question 34

What does the rising and sinking create?

Answer 34

Convention current

Question 35

? What does the current help with

Answer 35

Distribution of nutrients in bodies of Walter

Question 36

Where is it used as lubricant?

Answer 36

Around organs

Mucus in digestive tract

Question 37

What happens when it freezes??

Answer 37

Expands and becomes less dense

Question 38

Summerise use in organisms

Answer 38

• Solvent
• transport medium
• liquid at normal temperature
• Ice floats
• high heat c capacity
• reagent
• transparent:plants underwater canphotosynthesis