Exchange of materials (Edexcel GCSE Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Where is urea formed in the body?
Where is urea formed in the body?
Liver
Why don't unicellular organisms need specialised transport systems?
Why don't unicellular organisms need specialised transport systems?
High SA:V ratio allows efficient diffusion
Through what structure do substances diffuse in single-celled organisms?
Through what structure do substances diffuse in single-celled organisms?
Cell membrane
Why do multicellular organisms need specialised exchange surfaces?
Why do multicellular organisms need specialised exchange surfaces?
Smaller SA:V ratio
What does xylem transport in plants?
What does xylem transport in plants?
Water and mineral ions from roots
What does phloem transport in plants?
What does phloem transport in plants?
Sugars and amino acids from leaves
What is the function of alveoli in the lungs?
What is the function of alveoli in the lungs?
Gas exchange
What do villi in the small intestine absorb?
What do villi in the small intestine absorb?
Dissolved food molecules
Why do effective exchange surfaces have thin barriers?
Why do effective exchange surfaces have thin barriers?
Provide short diffusion path
How does ventilation help gas exchange in the lungs?
How does ventilation help gas exchange in the lungs?
Maintains concentration gradient
What happens to SA:V ratio as organism size increases?
What happens to SA:V ratio as organism size increases?
It decreases