photosynthesis

• what do plants need to grow?

  • light energy
  • carbon dioxide
  • water
  • minerals
• osmosis

  the diffusion of water particles from an area of low solute concentration to a high solute concentration through a partially permeable membrane. until the water reach equilbrium
• active transport

  the movement of molecules across a membrane from an area of low solute concentration to an area of high solute concentration; this process requires energy and mitochondria release energy during respiration
• what is the difference between osmosis and active transport?

  Osmosis: low to high concentration across a semi-permeable membrane. Active transport: high to low concentraion requiring energy.
• root hair cells

  • large surface area: absorb more water via osmosis
  • lots of mitochondria: release more energy for active transport
  • no chloroplasts: does need to carry out photosynthesis
• surface area


  area that covers the surface of an object
• why do leaves have a large surface area?

  more light energy can be absorbed for photosynthesis
• stomata

  holes that allow gas exchange
• guard cells


  allows the stomata to open and close
• gluclose

  • cellulose: building and giving strength to cell walls
  • lipids: storing energy
  • proteins (amino acids): growth and pollen production
  • starch (carbohydrates): storing energy
• crop yield


  how many crops are produce per hectare of land
• factors that affect growth of plants

  • carbon dioxide concentration
  • amount of light
  • temperature
  • volume of water
  • space to grow
  • insects/pests or animals
• why do plants need water?

  • keeps plant rigid
  • cool down leaves
  • photosynthesis
  • transports nutrients around plant