Which structure is found in plant cells but not animal cells?
23 marks
An image of a cell is 18 mm long. The real length of the cell is 0.012 mm. Calculate the magnification.
34 marks
Explain why an enzyme stops working at high temperatures.
43 marks
Explain the role of bile in digestion.
53 marks
Compare aerobic and anaerobic respiration in muscles.
62 marks
Write the word equation for photosynthesis.
73 marks
A potato cylinder had a mass of 2.40 g. After 30 minutes in a sugar solution its mass was 2.64 g. Calculate the percentage change in mass and explain what this shows.
84 marks
Describe the stages of the cell cycle.
94 marks
Explain why the human circulatory system is described as a double circulation.
104 marks
Describe how water moves from the roots to the leaves in a plant.
114 marks
Describe the pathway of a reflex action when a hand touches a hot object.
124 marks
Explain how blood glucose concentration is controlled after a meal.
133 marks
Explain how auxin causes a shoot to grow towards light.
144 marks
Explain how the body responds when its core temperature rises.
154 marks
Describe how the kidney produces urine.
163 marks
Describe three differences between prokaryotic and eukaryotic cells.
173 marks
An image of a cell is 45 mm long. The real length of the cell is 0.03 mm. Calculate the magnification.
183 marks
In an investigation, 2.4 cm³ of oxygen was collected in 40 s from hydrogen peroxide broken down by catalase. Calculate the mean rate of reaction in cm³/s and name one variable to control.
191 mark
Which organ produces bile?
Finished?
Answer every question to finish (19 left), or finish when the time’s up.
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This paper is written by Plasmo in the style of the OCR GCSE Combined Science exam. It is not a past paper and is not produced or endorsed by the exam board.