bioenergetics

• how to investigate the effect of excercise on the body?

  1.measure breathing rate by counting breaths and heart rate by taking pulse.

  2.take pulse after 5 mins of exercise

  3.pulse rate increase the more intense the exercise is.
• What is oxygen debt?

  The amount of extra oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from the cells.
• what happens when you excercise more?

  muscles need more energy from respiration to contract so increase respiration.so more oxygen is needed in cells.

  when your body cant supply oxygen muscles respire anerobically.this can cuase muscle fatigue
• whats the word equation for anaerobic respiration in plants and yeast cells?

  glucose---> ethanol+carbon dioxide
• what is the word equation of anaerobic respiration in muscle cells?

  glucose--->lactic acid
• What is anaerobic respiration?

  respiration without oxygen its the incomplete breakdown of glucose making lactic acid.
• What's the symbol equation for aerobic respiration?

  C6H12O6+6O2--->6CO2+6H2O
• whats the word equation of aerobic respiration?

  glucose+oxygen->carbon dioxide+water
• where does aerobic respiration take place?

  mitochondria
• what is aerobic respiration?

  Respiration with oxygen
• How are lipid molecules made?

  One molecule of glycerol & three fatty acids
• how is starch,glycogen and cellulose made?

  lots of small glucose molecules are joined together
• how do organisms use the energy by respiration

  build larger molecules from smaller ones

  allow muscles to contract

  keep body temp steady
• what is respiration?


  the process of transferring energy from the breakdown of glucose. an exothermic reaction
• how do you make ideal conditions for farming?

  to keep temp righ farmers use heaters in winter and shades in summer

  an artificial light is used

  use a paraffin heater to increase co2

  use fertilisers to keep minerals in the summer
• what is the control variable for the pondweed practical?

  temp and time
• how is the pond weed practical done?

  1. source of light is placed at x distance from pondweed

  2. the pondweed is left to photosynthesis for x amount of time

  2. at the end the syringe is used to draw the gas bubble in the tube up alongside a ruler and is then measured.
• what is the practical for photosynthesis

  pondweed practical
• how does temp effect rate of photosynthesis?


  if its too low the enzymes needed for photosynthesis work slower but if the plant is too hot the enzymes will become damaged this is about 45c.
• How does c02 effect rate of photosynthesis?

  the amount of co2 will only increase the rate of photosynthesis up to a point
• how does light effect rate of photosynthesis?

  light provides the energy so as light increases the rate of photosynthesis steadily increases to a certain point
• What affects the rate of photosynthesis?

  Light, CO2, temperature,chlorophyll
• What type of reaction is photosynthesis?

  it is a endothermic reaction so energy is transferred from the environment to the chloroplasts by light in the process
• 5 ways plants use the glucose

  1. respiration

  2. making cellulose

  3. making amino acids

  4. stored as oils or fats

  5. stored as starch
• What is the symbol equation for photosynthesis?

  6CO2 + 6H2O → C6H12O6 + 6O2
• What is the word equation for photosynthesis?

  Carbon dioxide + water -> glucose + oxygen
• where does photosynthesis take place?

  Chloroplast in green plant cells
• what does photosynthesis produce?

  glucose and oxygen