Bioenergetics (P1)

Question 1

Where in a plant does photosynthesis take place?

Answer 1

Chloroplasts

Question 2

What is an endothermic reaction?

Answer 2

Energy is transferred from the environment in the process.

Question 3

What is the word equation for photosynthesis?

Answer 3

carbon dioxide + water –light–> glucose + oxygen

Question 4

Why do plants store glucose as starch?

Answer 4

So its ready for when photosynthesis isn’t happening like in winter.

Question 5

What is meant by a limiting factor for photosynthesis?

Answer 5

Something that reduces the production of photosynthesis e.g. intensity of light, concentration of CO2 and temperature.

Question 6

What effect would low carbon dioxide concentration have have on the rate of photosynthesis?

Answer 6

Slows down the rate of photosynthesis.

Question 7

Describe how you could measure the effect of light intensity on the rate of photosynthesis.

Answer 7

1) Start by taking a boiling tube and placing it 10cm away from an LED light (as it doesn’t emit much heat)
2) Fill boiling tube with sodium hydrogen carbonate solution (it releases CO2 which is needed for photosynthesis).
3) Put a piece of pondweed in the boiling tube with the end out of the top. Leave this for five minutes to let the pond weed acclimatise to the boiling tube. Bubbles should start to see bubble rise from the cut end (oxygen).
4)Start a stop watch and count the amount of bubbles produced in one minute. Repeat this two times and calculate a mean number of bubbles.
5) Continue to repeat the experiment but placing the boiling tube further by 10cm each time.

Question 8

In the inverse square law, how are light intensity and distance linked?

Answer 8

Distance and light intensity are inversely proportional to each other.

Question 9

What is respiration?

Answer 9

Respiration is the process of transferring energy from glucose, which goes on in every cell.

Question 10

What is an exothermic reaction?

Answer 10

A reaction that transfers energy to the environment.

Question 11

Name the products of aerobic respiration.

Answer 11

Carbon dioxide
Water

Question 12

What is produced by anaerobic respiration in muscle cells?

Answer 12

Lactic acid.

Question 13

What is the word equation for anaerobic respiration in yeast cells?

Answer 13

Glucose —> ethanol + carbon dioxide

Question 14

Name two products of the food and drink industry that fermentation is needed for.

Answer 14

Bread
Alcohol

Question 15

Give three things that increase to supply the muscles with more oxygenated blood during exercise.

Answer 15

Breathing rate
Breath volume
Heart rate