Topic B2.2: The challenges of size (OCR Gateway A GCSE Combined Science)

This bundle of 7 lessons covers the majority of the content in the sub-topic B2.2(The challenges of size) of the OCR Gateway A GCSE Combined Science specification. The topics covered within these lessons include:

• Explain the need for exchange surfaces and a transport system in a multicellular organism due to the low SA:V ratio
• The exchange of oxygen and carbon dioxide with the blood at the alveoli
• Explain how the structure of the heart and the blood vessels are adapted to their function
• Explain how the red blood cells and plasma are adapted to their transport function in the blood
• Describe the processes of transpiration and translocation
• Explain how the structure of the xylem and phloem are adapted to their functions in the plant
• Explain the effects of a variety of factors on the rate of water uptake
• Describe how a simple potometer can be used to investigate the rate of water uptake

All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.