B6 plant structures and their functions

• What is the word equation for photosynthesis?

  Carbon dioxide + water → glucose + oxygen
• What is the symbol equation for photosynthesis?

  6 CO2 + 6H2O → C6H12O6 + 6O2
• Is photosynthesis an exothermic or endothermic reaction?

  endothermic
• Which part of a plant cell absorbs light for photosynthesis?

  chloroplast
• How temp affects photosythesis

  increased temp=increases photosynthesis

  OPTIMUM TEMP BEFORE ENZYME DENATURES
• How light intensity affects photosynthesis

  higher light intensity=faster rate of reaction
• co2 conc affect on photosynthesis

  high co2 conc=high photosynthesis
• PRATICAL

  1)use the ruler to place the flask and pondweed 15cm from the lamp

  2)leave the apparatus for around 10mins to allow the pondweed to adjust

  3)connect the gas syringe to the flask and record the change in volume on the syringe after 5 mins

  4)Move the lamp 10cm further away and measure the volume change again.REPEAT
• How is the structure of root hair cells adapted to absorb water and mineral ions?

  Large surface area and many mitochondria for active transport
• Name the structure in which water and minerals are transported through a plant

  xylem
• Name the structure in which sucrose is transported through a plant

  phloem
• structure of xylem:

  lignified dead cells. The dead cells have no cytoplasm so there is more space for water to move through. The wall are strengthened with lignin rings which makes them strong and stops them collapsing.
• How are phloem adapted to their function?

  They have living cells which use energy to transport substances. They contain seive tube elements and companion cells.
• Name the process by which water and mineral ions are transported through a plant

  transpiration
• Name the process by which sucrose is transported through a plant

  translocation
• three factors that affect the rate of transpiration light intensity, air movement and temperature
• How does air movement affect transpiration? 


  More air movement means transpiration increases
• . How does temperature affect transpiration?

  Higher temperature leads to a faster rate of transpiration
• rate of transpiration- distance moved divided by time taken