Reasons for a Transport System (OCR A-Level Biology A): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What do all cells require from their surroundings to carry out metabolic processes?
What do all cells require from their surroundings to carry out metabolic processes?
Nutrients and oxygen
Why does diffusion work effectively for single-celled organisms?
Why does diffusion work effectively for single-celled organisms?
Distances substances travel are short
How long would oxygen take to reach the centre of a 10 cm diameter organism by diffusion alone?
How long would oxygen take to reach the centre of a 10 cm diameter organism by diffusion alone?
Approximately 10,000 seconds (nearly 3 hrs)
In terms of oxygen transport, what does an organism's surface area represent?
In terms of oxygen transport, what does an organism's surface area represent?
The supply of oxygen
What happens to the surface area:volume ratio as organisms increase in size?
What happens to the surface area:volume ratio as organisms increase in size?
It decreases
A cube organism doubles from 1 cm to 2 cm sides. By how much does volume increase?
A cube organism doubles from 1 cm to 2 cm sides. By how much does volume increase?
8 times
What effect does higher activity in large animals have on oxygen demand?
What effect does higher activity in large animals have on oxygen demand?
Increases demand for oxygen and nutrients
What is mass flow?
What is mass flow?
Directed movement driven by mechanical force
How does mass flow solve the distance problem in large organisms?
How does mass flow solve the distance problem in large organisms?
Blood circulates rapidly in secs/mins
What is the role of specialized exchange surfaces like lungs in the circulatory system?
What is the role of specialized exchange surfaces like lungs in the circulatory system?
Provide enormous surface area near all cells