Science - B4 - Photosynthesis 0.0 / 5 ? Applied ScienceB4 - PhotosynthesisGCSEOCR Created by: chlo-smallmanCreated on: 19-02-14 15:35 Photosynthesis is a TWO-stage process: 1st - light energy splits water into oxygen gas and hydrogen ions. 2nd - carbon dioxide gas combines with the hydrogen to make glucose and water. 1 of 13 ISOTOPE experiments show that the oxygen comes from the water. Limiting factors of Photosynthesis: Carbon dioxide, light and temperature. 2 of 13 Greek scientists all improved the understanding of photosynthesis. Leaves are adapted for effective photosynthesis - large surface area, thin, contain pigments, have vascular bundles and guard cells. 3 of 13 The balanced symbol equation for photosynthesis is: light energy 4 of 13 DIFFUSION is.. the net movement of particles from a high concentration to a low concentration. 5 of 13 The rate of DIFFUSION is increased by - a shorter distance, a greater concentration gradient and a greater surface area. 6 of 13 TRANSIPRATION is.. the evaporation and diffusion of water from leaves. 7 of 13 Transpiration rates is INCREASED by increased light intensity, temperature, air movement and a decrease in humidity. 8 of 13 Osmosis is.. the net movement of water from a high to a low water concentration across a partially permeable membrane. 9 of 13 PLANTS require: NITRATES for cell growth PHOSPHATES for respiration and growth POTASSIUM for respiration and MAGNESIUM for photosynthesis. 10 of 13 Minerals are ABSORBED by ACTIVE transport which needs energy. DETRITIVORES feed on DEAD and DECAYING material. 11 of 13 Organic farming uses animal manure, crop rotation, weeding and differing planting times. Biological control has advantages (for chemical pesticides) and disadvantages 12 of 13 Hydroponics has advantages (better control of minerals and water) and disadvantages (lack of support). Intensive food production improves the efficiency of energy transfer. 13 of 13
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