Bioenergetics

Question 1

Is photosynthesis exo or endothermic

Answer 1

Endothermic

Question 2

How do plants get Carbon Dioxide

Answer 2

The stomata is opened up and it comes in through diffusion

Question 3

All the uses and stores of the glucose produced in photosynthesis

Answer 3

Stored as startch, fats and oils
Used to produce cellulose or amino acids

Question 4

Limiting factors of photosynthesis

Answer 4

Light Intensity, Carbon dioxide air levels, temperature

Question 5

Effect of Light intensity on the rate of photosynthesis

Answer 5

1. 20cm3 of Sodium hydrogen carbonate solution in a boiling tube
2. 10cm of pondweed with paper clip to one end
3. Clamp boiling tube in place
4. Place meter ruler next to clamp stand
5. Place lamp 10cm away from pondweed
6. Wait 2 mins until pond weed produces bubbles
7. Count number of bubbles produced per minute using stopwatch
8. Repeat steps 5-7 moving lamp 10cm further each time
9. Repeat experiment twice more

Question 6

Photosynthesis limiting reactant graph shape

Answer 6

Increasing the limiting reactant increases the rate of photosynthesis, however after a certain point the graph shape plateus as something else becomes the limiting reactant

Question 7

Features of a greenhouse that increase rate of photosynthesis and therefore plant growth

Answer 7

Temperature- Sun’s rays are trapped as heat in a greenhouse
Light intensity- Greenhouses are see through and often have artificial lights
Carbon dioxide- Paraffin heater heats the greenhouse and produces carbon dioxide

Question 8

What is the inverse square law with bioenergetics

Answer 8

Intensity of light is inversely proportional to the square distance from the source

Question 9

Light intenisty equation

Answer 9

Light intensity = 1/distancexdistance

Question 10

Is respiration exo or endothermic

Answer 10

Exothermic

Question 11

Anaerobic respiration symbol equation

Answer 11

C6H1206 —> 2C3H603 + ATP (energy)

Question 12

Example of anaerobic respiration apart from humans

Answer 12

Yeast (fermentation)

Question 13

Yeast anaerobic respiration equation

Answer 13

C6H1206 —> C2H5OH + C02 + ATP

Question 14

Why does the heart rate increase when we exercise

Answer 14

When someone execises theior muscles need more energy to move. The heart rate increases so more blood and oxygen can be pumped around the body to the muscles that need it, this oxygen is then used in respiration to get more energy for the muscles

Question 15

What do you have after you do anerobic respiration

Answer 15

Oxygen debt, lactic acid

Question 16

Metabolism definition

Answer 16

The sum of all the reactions in a cell or the body

Question 17

Metabolic processes include

Answer 17

Respiration
Amino acids join to form proteins
Glucose converted to startch

Question 18

What causes an oxygen debt in detail

Answer 18

Lactic acid is produces and is transported to the liver where it is converted back to glucose but oxygen is needed for this
Oxygen debt is the amount of oxygen needed for this