Biology Topic 4

Question 1

What is the reaction for photosynthesis?

Answer 1

Carbon dioxide + water = glucose + oxygen

Question 2

What is required for photosynthesis?

Answer 2

• light

Question 3

What factors affect photosynthesis?

Answer 3

• temp
• light intensity
• carbon dioxide concentration
• amount of chlorophyll

Question 4

How is glucose uses in plants?

Answer 4

• for respiration
• to produce amino acids to create proteins

Question 5

How does the body store glucose ?

Answer 5

• it converts it into starch or fat

Question 6

What is the reaction for aerobic respiration?

Answer 6

Glucose + oxygen = carbon dioxide + water
(The reverse of photosynthesis)

Question 7

What is the reaction for anaerobic respiration in muscles?

Answer 7

Glucose = lactic acid

Question 8

What is the reaction for anaerobic respiration in plants and yeast cells?

Answer 8

Glucose = ethanol + carbon dioxide

Question 9

Which type of respiration produces more energy?

Answer 9

Aerobic

Question 11

How does the human body respond to exercise?

Answer 11

• the heart rate increases to pump more oxygen round the body
• the breathing rate and breathing volume increases to increase the supply of oxygen
• blood vessels dilate

Question 12

What happens if insufficient oxygen is supplied to the body during exercise?

Answer 12

• anaerobic respiration starts to take place
• this produces lactic acid and causes lactic acid build up

Question 13

What is metabolism?

Answer 13

The sum of all the reactions in a cell or body

Question 14

What reactions does metabolism include?

Answer 14

• respiration
• the creation of proteins
• the breakdown of excess proteins