51ºÚÁÏ

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.