Protoctists

• Some protoctists can photosynthesise
• Photosynthesis equation


  carbon dioxide + water → glucose + oxygen
• Protoctists in food chain

  • Algae → pond snail (producer) → minnow → grey heron (consumers)
• All microorganisms need warmth, food and moisture to grow well
• Some microorganisms need light for photosynthesis
• Some microorganisms need oxygen for aerobic respiration
• Limiting factor


  Something that stops a population from increasing further
• Many unicellular microorganisms are decomposers
• Decomposers play an important part in the carbon cycle
• Signs of population growth

  • Steepness of line increases
  • Population grows quickly
  • Growth slows down when limiting factor is reached
• Some protoctists can photosynthesise
• Photosynthesis equation


  carbon dioxide + water → glucose + oxygen
• Protoctists in food chain

  • Algae → pond snail (producer) → minnow → grey heron (consumers)
• All microorganisms need warmth, food and moisture to grow well
• Some microorganisms need light for photosynthesis
• Some microorganisms need oxygen for aerobic respiration
• Limiting factor


  Something that stops a population from increasing further
• Many unicellular microorganisms are decomposers
• Decomposers play an important part in the carbon cycle
• Signs of population growth

  • Steepness of line increases
  • Population grows quickly
  • Growth slows down when limiting factor is reached