AQA GCSE · Biology 8461
5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Transport in cells.
A student calculates the surface area to volume ratio for four different cubes to model the efficiency of diffusion. Which ratio would belong to the organism that can most easily meet its needs through diffusion alone across its outer surface?
A student investigates the rate of water uptake in a plant shoot. The shoot is placed in a potometer and exposed to different environmental conditions.
The data collected shows that at \(20^{\circ}\text{C}\), the bubble in the potometer moved \(15\text{ mm}\) in \(10\text{ minutes}\). When the temperature was increased to \(30^{\circ}\text{C}\), the bubble moved \(24\text{ mm}\) in the same time period.
Calculate the rate of water uptake at \(30^{\circ}\text{C}\) in \(\text{mm/min}\).
A group of students investigated the surface area to volume ratio of three different sized cubes representing cells.
Cube A has a side length of \(1\text{ cm}\).
Cube B has a side length of \(2\text{ cm}\).
Cube C has a side length of \(4\text{ cm}\).
Which of the following statements correctly explains the relationship between cell size and the need for a specialized exchange surface?
Which process is responsible for the movement of mineral ions from very dilute solutions in the soil into plant root hair cells?
A student investigates the change in mass of potato cylinders in different sugar solutions. A cylinder with an initial mass of \(2.50\text{ g}\) is placed in a concentrated sugar solution. After 24 hours, its final mass is \(2.15\text{ g}\).
Calculate the percentage change in mass.
Explain how lungs in mammals are adapted for efficient gas exchange by increasing the effectiveness of an exchange surface.
Your answer should mention at least three specific structural adaptations.
Write your answer out first, then check it against the worked solution.
The alveoli in the lungs are adapted for gas exchange. Explain how having a ventilation system and an efficient blood supply increases the rate of diffusion of oxygen into the blood.
Write your answer out first, then check it against the worked solution.
Calculate the surface area to volume ratio of a cube-shaped model of a single-celled organism where each side length is \(2\text{ cm}\).
Write your answer out first, then check it against the worked solution.
* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.
This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.
Want more questions like these? Get a fresh set on this topic, graded as you go.
Practice More