past paper random

• how to see a zoomed in cell clearly

  turn the fine focusing knob until cells are in focus
• how to see zoomed out cells more clearly.

  rotate the objective Lense
• equation for microscopes


  magnification= image size/ real size
• what is a communicable disease??

  a disease that can spread from person to person because its caused by pathogens
• heart attack


  stops blood being pumped around the body so oxygen doesnt get to the cells and heart, so cells cannot respire enough
• life style factors (CHD)

  • SMOKING
  • EXERCISE
  • DIET
• photosynthesis equation


  6 carbon dioxide - 6 water = glucose +6 oxygen
• is photosythesis exothermic or endothermic?

  endothermic
• pond weed experement- accurate way to measure photosynthesis

  measure volume of gas
• does temperatue effect the rate of photosnthesis?

  yes, because photosythesis is controlled by enzymes
• why does people being vaccinated slow down spread of a virus?

  most people are immune so do not become ill from infection, less chance of unvaccinated inderviduals being exposed to the pathogen