4-Bioenergetics

Question 1

Is photosynthesis endo or exo thermic

Answer 1

Endothermic as energy is transferred from the environment

Question 2

What r the reactants of photosynthesis

Answer 2

Carbon dioxide

Water

Question 3

What r the products of photosynthesis

Answer 3

Glucose and oxygen

Question 4

How do you balance the photosynthesis symbol equation

Answer 4

666

Put a 6 in front of the CO2, H20 and 02

Question 5

What five ways do plants use glucose

Answer 5

Respiration 
Making cellulose
Making amino acids
Stored as oils and fats (seeds)
Stored as starch

Question 6

What r the limiting factors of photosynthesis

Answer 6

Light intensity
Concentration of CO2
Temperature
Chlorophyll can also be as it be affected by disease

Question 7

What links light intensity to distance

Answer 7

Light intensity is inversely proportional to the square of distance
eg. if u third the distance, the light intensity will be nine times greater

Question 8

How can farmers increase the levels of carbon dioxide in a greenhouse

Answer 8

Using a paraffin heater as a by product is CO2

Question 9

how does increasing light intensity change rate of photosynthesis

Answer 9

The rate increases until a point where it just plateaus

Question 10

How does levels of CO2 affect the rate of photosynthesis

Answer 10

Increases the rate until a point when it just plateaus

Question 11

How does temperature affect the rate of photosynthesis

Answer 11

Increases the rate and the rapidly decreases around 45C when the enzymes denature

Question 12

What plant is used in the practical for showing the effect of light intensity on photosynthesis

Answer 12

Canadian pondweed

Question 13

Why is an LED used in the required practical for the affect of light intensity on photosynthesis

Answer 13

Because it releases less heat than a filament bulb so the temperature is consistent throughout the practical

Question 14

How is the volume of oxygen produced measured in the required practical for photosynthesis

Answer 14

It is collected in a capillary tube and at the end it is drawn out with a syringe, where it can be measured.
Alternatively, the bubbles can be counted but this is not very reliable

Question 15

Is respiration endo or exo thermic

Answer 15

Exothermic

Question 16

What is respiration

Answer 16

The process of transferring energy from glucose

Question 17

How do organisms use the energy transferred in respiration

Answer 17

Allows muscles to contract and relax,
Build larger molecules from small ones- proteins from amino acids etc.
Mammals and birds use it keep body temperatures steady in cold surroundings

Question 18

What is metabolism

Answer 18

The sum of all the reactions in an organism

Question 19

What r the reactants fro aerobic respiration

Answer 19

Glucose and oxygen

Question 20

What r the products of aerobic respiration

Answer 20

Carbon dioxide and water

Question 21

What is the word equation for anaerobic respiration

Answer 21

Glucose —> Lactic acid

Question 22

Why does anaerobic respiration release less energy than aerobic

Answer 22

Because the glucose isn’t fully oxidised

Question 23

What is the equation for anaerobic respiration in yeast or plants

Answer 23

Glucose —> ethanol + carbon dioxide

Question 24

What is anaerobic respiration in yeast cells called

Answer 24

Fermentation

Question 25

What does build up of lactic acid cause

Answer 25

Muscles fatigue- the muscles stop contracting efficiently

Question 26

What is oxygen debt

Answer 26

The amount of extra oxygen your body needs to react with the build of lactic acid to remove it from your cells

Question 27

What does oxygen react with lactic acid to form

Answer 27

Carbon dioxide and water

Question 28

What other way can the body deal with high levels of lactic acid

Answer 28

Blood transports the lactic acid to liver where it is converted back into glucose

Question 29

How can you measure the effects of exercise size on the body

Answer 29

Measure breathing rate by counting breaths and heart rate by taking a pulse