Photosynthesis

• what is endothermic process?

  A chemical reaction that absorbs heat energy
• In which part of the plant does photosynthesis take place in?


  Chloroplast
• Equation for photosynthesis

  Carbon dioxide+ water =glucose+ oxygen
• What’s the balanced, chemical equation?

  6CO2+6H2O=C6H12O6+6O2
• What does the plant need glucose for?

  Respiration glucose is used to provide energy. Storage the glucose is converted into starch and oils. Useful substances is converted into cellulose for cell wall, protein for a growth and chorophyll
• How, and why is the plants desearched?

  Plant is left in the darkness for 48 hours to ensure there’s no start in the plant at the start of experiment so that any start present was made during experiment
• Explain the four steps involving testing for starch


  1. place leave in boiling water to kill the leaf and stop chemical reactions 2. place leave and boling ethanol to remove chlorophyll. 3. leaf rinsed in water to soft leaf 3. iodine spread on leaf to test for starch.
• What is a variegated leaf?


  That is green in the middle and white at the outside
• How does it show that chlorophyll I s needed for photosynthesis?

  No chlorophyll, no photosynthesis, no starch
• What does sodium hydroxide absorb? how with this effect photosynthesis?


  It absorbs carbon dioxide, no CO2, no photosynthesis, no starch
• What is measured to calculate the rate of photosynthesis?

  Number of bubbles given off over the period of time
• What is a limiting factor?

  A factor, when, in a low level slows process of photosynthesis
• List three factors that affect the rate of photosynthesis

  Temperature, light indensity and carbon dioxide
• What indicator is used to show small changes in carbon dioxide levels?

  Hydrogencarbonate indicater
• What colour does indicator change to increased carbon dioxide levels?

  Yellow when it’s dark respiration only occur
• What colour does this indicator change to decreased carbon dioxide levels?

  Purple when CO2 used in photosynthesis is greater than CO2 produced in respiration
• What colour does this indicator change to normal carbon dioxide levels?


  Red
• How, is a leaf adapted for gas exchange?

  Spongy mesophyll cells - large surface area. Intercellular air spaces-allow diffusion of gases. stomata and guard cells-allow diffusion of gases in and out of leaf