3 Exchange and transport

Practice questions on Exchange and transport

• Explain why a single-celled organism such as Amoeba can rely solely on diffusion to meet i… (4 marks, Explain)
• Explain why a large multicellular organism cannot rely solely on diffusion across its oute… (4 marks, Explain)
• Explain why a large multicellular organism, such as a mammal, requires a specialised excha… (4 marks, Explain)
• Explain why the mammalian circulatory system is described as a double circulatory system, … (4 marks, Explain)
• Explain why a large multicellular organism, such as a mammal, requires a specialised excha… (4 marks, Explain)
• Explain why the blood leaving the left ventricle must be maintained at a higher pressure t… (4 marks, Explain)
• Explain why the removal of a ring of bark and phloem from around the trunk of a tree event… (4 marks, Explain)
• Explain why the mammalian circulatory system is described as a double circulation, and out… (4 marks, Explain)
• Explain how the structure of a sieve tube element is adapted for its function in the phloe… (4 marks, Explain)
• Explain why the mammalian circulatory system is described as a double circulatory system, … (4 marks, Explain)
• Explain why companion cells are essential for the loading of sucrose into sieve tube eleme… (4 marks, Explain)
• Explain how the structure of a sieve tube element is adapted for the mass flow of assimila… (4 marks, Explain)
• Explain why the mammalian heart is described as a 'double pump', and explain how this arra… (4 marks, Explain)
• Explain how the structure of a sieve tube element is adapted to allow the mass flow of ass… (4 marks, Explain)
• Explain why the gills of a fish are an effective exchange surface for gas exchange between… (4 marks, Explain)