Bioenenergetics

Question 1

What is the equation for glucose

Answer 1

C6H12C6

Question 2

What is the equation for photosynthesis?

Answer 2

Light
Carbon dioxide + water ———> glucose + oxygen

Which is an endothermic reaction.

Question 3

What are products of photosynthesis?

Answer 3

Oxygen and glucose

Question 4

What are reactants of photosynthesis?

Answer 4

carbon dioxide and water

Question 5

How have leafs adapted for photosynthesis?

Answer 5

• Big surface area for light to fall on
• thin for easy diffusion
• they contain a lot of chlorophyll to absorb light
• air spaces to allow c d in and o out by diffusion
• guard cells open and close the stomata to regulate gas exchange

Question 6

What color will the product turn when starch is present?

Answer 6

Blue/black

Question 7

What is the test for glucose?

Answer 7

Benedict solution (turns from blue to a dark orange)

Question 8

What are the limiting factors of photosynthesis?

Answer 8

Light- the light intensity is the main reactant needed for photosynthesis to take place

Temperature- as the temperature rises the rate of photosynthesis increases

Carbon dioxide concentration- the concentration level is higher in the dark so the higher the concentration the reaction increases as more carbon dioxide is being used

Question 9

P1 How can we tell when photosynthesis is taking place?

P2 how high does temperature have to be for photosynthesis to stop taking place?

Answer 9

Less light= less bubbles in the water experiment
More light= more bubbles

Around 40-50°C because the enzymes become denatured

Question 10

What are uses of glucose in plants?

Answer 10

• Starch for storage - converted into insoluble
• Respiration- releases energy + growth
• Making lipids- uses energy to make fats, energy store, respires as it germinates
• Cellulose- for strength

Question 11

How do greenhouses affect the rate of photosynthesis?

Answer 11

Because the inside of the greenhouse is warm which affects the temperature which speeds up photosynthesis whilst still taking in light from the glass casing

Question 12

What happens during aerobic respiration?

Answer 12

Glucose reacts with oxygen in the body to create energy, carbon dioxide and water are waste products of this exothermic reaction which occurs in the mitochondria (the site of respiration)

Question 13

What is the equation of aerobic respiration?

Answer 13

Glucose + oxygen —> carbon dioxide + water

Question 14

How has muscle tissue adapted for respiration?

Answer 14

The muscle tissue is made up of protein fibres which contain a lot of mitochondria so the muscles can contract. Muscle tissue also contains glucose in the form of carbohydrate glycogen which can convert back to glucose during aerobic respiration

Question 15

What happens in your body during exercise?

Answer 15

• Your heart rate increases
• Muscles dilate
• increases the supply of glucose and oxygen and increases the rate of carbon dioxide
• The depth of breathing increases/ the rate
• anaerobic respiration begins to take place

Question 16

What is anaerobic respiration?

Answer 16

Anaerobic respiration occurs when not enough oxygen can be supplied to the body (oxygen debt) instead of carbon dioxide being produced as waste products its lactic acid (only in animal cells) the liver is in charge of converting lactic acid back into glucose

Question 17

What is oxygen debt?

Answer 17

During exercise we tend to be out of breath even after we’ve stopped contracting our muscles, this is because there is still lactic acid left which needs to be converted back into glucose, this process can only be done with oxygen so we need to supply extra oxygen to pay off the oxygen debt, the bigger the debt (the amount of lactic acid) the longer you will pant for which shows how fit or unfit you are

Question 18

What happens in plants during anaerobic respiration?

Answer 18

Instead of the plants producing lactic acid, instead the glucose produces ethanol and carbon dioxide

Glucose —> ethanol + carbon dioxide