B4 The Processes of Life Summary

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  • Created by: Farhana
  • Created on: 23-12-12 19:30
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  • Cells
    • Cell wall- cellulose, supports & strengthens cell
    • Vacuole contains cell sap, weak solution of sugar/salts
    • Chloroplasts- where reactions for photosynthesis take place. Contain chlorophyll & enzymes needed for photosynthesis
      • Photosynthesis is a series a chemical reactions that uses energy from sunlight to produce food
        • Carbon dioxide  + Water >light energy> Glucose + Oxygen
          • 6CO2 + 6H2O >lght energy> C6H12O6 + 6O2
          • Plants use glucose in 3 main ways
            • 1. Used for Respiration - releases energy
            • 2. Used to make chemicals for Growth - combined w/ nitrates>amino acids> proteins
            • 3. Stored as Starch- for when rate of photosynthesis is slow(winter)
        • 3 Factors affect the rate of photosynthesis
          • 2. Amount of CO2
          • 1. Amount of Light
          • 3. Temperature- 45'C- enzymes
          • Investigating photosynthesis- Transects are a way of investigating how something changes across an area, 2 fixed points, collecting data in inside them
            • Use a light meter to measure the level of light
            • Use a quadrat to make data collection quicker/easier- a square frame with 100 squares
            • Use an identification key to identify the diff. plant species
  • Diffusion-  passive(without energy) overall movement of PARTICLES form a region of their HIGHER concentration to LOWER concentration
    • Active transport- overall movement of CHEMICALS across a cell membrane from a region of LOWER concentration to HIGHER concentration using ENERGY released by respiration
      • Example: plants take in minerals like nitrates through roots by active transport. Concentration of minerals in root cells is higher than in the soil. Active transport uses energy to move minerals from soil to root cells
    • Example: when plants photosynthesise, they use up CO2 from the atmosphere & produce O2- gases pass in/out of plant leaves by diffusion


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