quiz

• What is photosynthesis?

  A chemical reaction transferring energy from light
• What type of reaction is photosynthesis?

  It is an endothermic reaction
• What pigment absorbs light energy in plants?

  Chlorophyll
• How are leaves adapted for photosynthesis?

  They increase the rate of photosynthesis when needed
• What is a limiting factor in photosynthesis?

  Anything that limits the rate of a reaction
• What are the limiting factors for photosynthesis?

  • Temperature
  • Light intensity
  • Carbon dioxide concentration
  • Amount of chlorophyll
• How does less chlorophyll affect photosynthesis?

  It reduces the rate of photosynthesis
• What happens to chlorophyll in well-lit areas?

  More chlorophyll may be produced
• How do limiting factors interact in photosynthesis?

  Any one may limit photosynthesis
• What does the lowest curve on the graph indicate?

  Both carbon dioxide and temperature limit photosynthesis
• What happens when both temperature and carbon dioxide are increased?

  Photosynthesis rate increases until another factor limits
• What is the inverse square law in relation to light intensity?

  Light intensity decreases as distance increases
• What happens to light intensity if the distance is doubled?

  It falls by three-quarters
• How do commercial greenhouses utilize limiting factors?

  • Control limiting factors
  • Maximize photosynthesis rates
  • Grow plants quickly
  • Produce high yields profitably
• Why is the rate of photosynthesis low at low temperatures?

  Molecules have less kinetic energy
• What happens to enzymes at high temperatures during photosynthesis?

  They become denatured
• What are the uses of glucose produced in photosynthesis?

  • Converted into insoluble starch for storage
  • Produced as fat or oil (lipids) for storage
  • Used to produce cellulose for cell walls
  • Used to produce amino acids for protein synthesis
• What is the role of nitrate ions in plants?

  Needed for amino acid synthesis