Paper 2 Feedback

• which scientists suggested the theory of evolution by natural selection

  Alfred Wallace and Charles Darwin
• what is the approximate biomass of the moss that becomes biomass in primary consumers

  34 g/$m^2$/ year
• why most dead remains don't decay

  lack of oxygen for respiration means less energy released for the decomposers reactions
• what substance can a plant make using nitrogen

  protein
• uses of auxin

  root powder

  weed killer
• why would a plant be sprayed with giberellin

  to promote flowering

  encourage more fruit to grow
• ways to improve the method during a rule drop experiment

  have a more precise scale on the ruler

  drop the ruler from the same height
• 2 ways coordination is different in the endocrine system from the nervous system

  endocrine system is via the blood

  endocrine system is a chemical transmission
• what is a dominant allele

  an allele that is always expressed
• what happens to remaining biomass of food in digestion

  it is lost via faeces
• what happens to glucose in the kidneys

  glucose is filtered out of the blood and then reabsorbed
• what happens to protein in the kidneys

  protein doesn't get filtered out of the kidneys because the molecule is too big
• what happens to urea in the kidneys

  urea is filtered out of the blood and passed out of the body in the urine
• what does ADH hormone do

  reduce urine levels
• how does ADH affect the production and concentration of urine by the kidneys

  increase in ADH levels will increase the water reabsorption from the kidney tubules so urine concentration will increase and volume will decrease