Bioenergetics

Question 1

what is the word equation for photosynthesis?

Answer 1

carbon dioxide + water ———–> glucose + oxygen

Question 2

what is the symbol equation for photosynthesis?

Answer 2

6CO2 + 6H20 ————> C6H1206 + 6O2

Question 3

what are the main ways glucose is used in plants?

Answer 3

• respiration
• to make cellulose ( glucose —-> cellulose for cell wall )
• making amino acids ( glucose + nitrate ions )
• stored as oil or fats ( glucose is turned into lipids )
• stored as starch ( glucose is stored in the root as starch and it is insoluble )

Question 4

what are the limiting factors of photosynthesise?

Answer 4

• light intensity
• temperature
• CO2 concentration

Question 5

what is the experiment by which photosynthesis rate can be measured?

Answer 5

the pond weed experiment

Question 6

how can the pond weed experiment be improved?

Answer 6

instead of counting bubbles that are produced, gas is COLLECTED in a GAS SYRINGE

Question 7

how can the pond weed experiment be altered for the effects of temperature ?

Answer 7

put in a water bath at specific heat

Question 8

how can the pond weed experiment be altered for the effects of carbon dioxide concentration?

Answer 8

add a measured amount of sodium hydro carbonate which can dissolve in the water and will give of carbon dioxide

Question 9

what is the inverse square law ?

Answer 9

as the distance increases the light intensity decreases
- light intensity decreases in proportion to the square of the distance

1/(d)^2

Question 10

how can ideal conditions be artificially created ?

Answer 10

a greenhouse

• traps in heat so its not a limiting factor during winter
• heaters and ventilation can also be used to maintain temperature
• enclosed to keep plants free of disease and pests

Question 11

what is respiration?

Answer 11

the process of transferring energy form glucose, which goes occurs in every cell
- exothermic

Question 12

what is metabolism?

Answer 12

metabolism is ALL chemical reactions in an organism

Question 13

what is the word and symbol equation for aerobic respiration?

Answer 13

glucose + oxygen ——> carbon dioxide + water

C6H12O6 + 6)2 ——> 6CO2 + 6H2O

Question 14

what is the equation for anaerobic respiration?

Answer 14

glucose ——> lactic acid

Question 15

what is the word equation for anaerobic respiration in YEAST?

Answer 15

glucose ——> ethanol + carbon dioxide

Question 16

what happens when you exercise ?

Answer 16

• muscles need energy so respiration is increased
• increased respiration means you need more oxygen
• which means breathing rate increases to get more oxygen into the blood
• heart rate increases to get more oxygenated blood around the body faster and removes carbon dioxide more quickly

Question 17

how is lactic acid formed ?

Answer 17

incomplete oxidation of glucose

Question 18

what is oxygen debt?

Answer 18

• oxygen debt is a result of anaerobic respiration
• it is the amount of oxygen needed to remove the build of lactic acid from the cells as your body couldn’t keep up with demand earlier on