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All resources for B2.2 The Challenges of Size GCSE OCR Biology Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Each PowerPoint is a whole lessons included with student activities and animated answers. Calculating total surface area of a cube Calculating volume of a cube Calculating surface area to volume ratio Exchange surfaces in the alveoli and villi A large surface area to volume ratio allows diffusion to occur. The circulatory system is a closed system. Recap: Aerobic Respiration Structure of arteries, veins, and capillaries. Blood flows through the heart twice in every circuit of the body - the double circulatory system. Left and right in the heart The four chambers of the heart Labeling the heart Circulation of blood around the body The components of blood and their functions Plasma Red blood cells White blood cells Platelets Structure and function of xylem. Structure and function of phloem. Water enter the plant from the root hair cells by osmosis. Mineral ions enter the plant from the root hair cells by active transport. Sugars are produced in the leaves (chloroplasts) during photosynthesis. Water diffuses into the root hair cells by osmosis. Water moves up the stem through the xylem. Water is lost from leaves by evaporation through open stomata. Labelling the stomata The role of the cuticle How water loss efftects the stomata Factors that affect the rate of transpiration: Light intensity Temperature Air movement (wind) Humidity. How open stomata increase the rate of transpiration. Graphs of rate of transpiration against different variables. Concentration gradients and rate of transpiration Calculations of the rate of transpiration.

All resources for B2.1 Supplying the cell GCSE OCR Biology Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Each PowerPoint is a whole lessons included with student activities and animated answers. Definition of diffusion from high concentration to lower concentration. What diffuses in and out of cells. How the rate of diffusion is affected by distance, surface area, and concentration gradient. How the human body has adapted to increase the rate of diffusion. Definition of osmosis. Explaining water potential and concentration of solution. How cells change during osmosis - turgid, lysis, crenated, plasmolysed. Definition of active transport Key features of active transport Against concentration gradient. ATP and respiration Protein carriers in cell membrane Active transport in plant cells - root hair cells Active transport and protein carriers The cell cycle DNA replication Movement of chromosomes Cytokinesis (cell division) Growth of daughter cells. Stem cell donation registration process Stem cells are undifferentiated cells. Describe the difference between adult and embryonic stem cells. Stem cells are found in plant meristems Explain why stem cells are used in medicine. Describing the structure of the following cells: Sperm cell Fat cell Red blood cells Ciliated cells Palisade cells