Making the Most of Photosynthesis

• What does the amount of photosynthesis in a plant determine?

  The biomass made and how fast it grows
• Why do farmers want plants to grow quickly and large?

  To make a profit
• What can farmers control in greenhouses to affect plant growth?

  The environment of the plants
• What are the benefits of using greenhouses/polytunnels?

  • Warmer atmosphere speeds up photosynthesis
  • Artificial lighting is possible
  • More carbon dioxide can be pumped in
  • Water levels controlled
  • Flowers/fruits produced earlier
  • Can produce fruits that don't normally grow there
• What are some fruits that can be produced in greenhouses that might not normally grow in a specific location?

  Peaches, lemons, etc.
• What is hydroponics?

  Growing plants without soil
• What materials can be used as substrates in hydroponics?

  Clay, perlite, or rockwool
• What factors can be controlled using hydroponics?

  All environmental factors
• Besides environmental factors, what else can be altered by using hydroponics?

  Shape, size, taste or even colour
• What are the advantages of hydroponics?

  • Faster turnover of profits
  • Crops are clean and unspoilt
  • No ploughing and preparing the land
  • Can be grown where soil is poor
  • Fewer staff needed
  • Less water and energy used
• What are the disadvantages of hydroponics?

  • High set up costs
  • Greenhouses can use a lot of energy for heating