Bioenergetics

Question 1

What is the word equation for photosynthesis

Answer 1

Carbon dioxide + water —light—> glucose + oxygen. It is endothermic

Question 2

What is the symbol equation for photosynthesis

Answer 2

6CO2 + 6H20 —light—> C6H12O6+ 6O2

Question 3

What 5 ways do plants use glucose

Answer 3

For respiration
Making cellulose
Making amino acids
Stored as oils or fats
Stored as starch

Question 4

What are limiting factors that affect the rate of photosynthesis

Answer 4

Light
Concentration of CO2
Temperature
Possibly chlorophyll( if it has a disease like tobacco mosaic virus)

Question 5

Equation for light intensity and distance

Answer 5

Light intensity = 1/ distance squared

Question 6

What is respiration

Answer 6

The process of transferring energy from glucose, which goes in every cell. It is exothermic

Question 7

Three ways in which respiration transfers energy

Answer 7

To build up larger molecules from smaller ones
In animals its used to allow muscles to contract (so we can move)
In mammals and birds to keep their body temperature steady in colder surroundings

Question 8

What is the metabolism

Answer 8

All the chemical reactions in an organism or a sum of all the reactions that happen in a cell or the body

Question 9

Word and symbol equation for aerobic respiration and one fact about it

Answer 9

Glucose (C6H12O6) + oxygen (6O2) ——-> carbon dioxide (6CO2) + water (6H2O).
Most aerobic reactions happen in the mitochondria

Question 10

Word equation and one fact about anaerobic respiration

Answer 10

Glucose ——> lactic acid
Does not transfer as much energy as aerobic so is only useful in emergencies

Question 11

Word equation for anaerobic respiration in plants

Answer 11

Glucose ——> ethanol + carbon dioxide

Question 12

Two things that fermentation is needed to make

Answer 12

Bread and alcohol

Question 13

What is oxygen debt

Answer 13

Amount of extra oxygen your body needs to react with the build up of lactic acid and remove it from the cells

Question 14

What are two ways to deal with lactic acid

Answer 14

Get more oxygen then the oxygen turns it into carbon dioxide and water
Blood sends it to the liver where it turns to glucose

Question 15

The pondweed and light intensity required practicle

Answer 15

1) A source of light is placed at a specific distance from the pondweed
2) The pondweed is left to photosynthesise for a set amount of time and the oxygen released will collect in the capillary tube
3) At the end the syringe draws the gas bubble in the tube and the length of the gas bubble is measured with a ruler. Its proportional to O2 volume
4) Any control variables should be monitored like the temp and the time the pondweed has to photosynthesise
5) Repeat this experiment twice with the light source at the same distance and the mean volume of O2 produced is calculated
6) The whole experiment is repeated with the light source at a different distance from the pondweed to see how light source affects the rate of photosynthesis