Exam practice
Exam questions
Write your answer. Then open the mark scheme and tick each point you made.
- Question 1 of 91 mark
Name the part of a cell that controls what the cell does.
Mark scheme
- Nucleus
- Question 2 of 92 marks
State two parts found in plant cells but not in animal cells.
Mark scheme
- Cell wall
- Chloroplasts
- Vacuole
- Question 3 of 92 marks
Describe the job of the mitochondria.
Mark scheme
- Respiration happens there
- Energy is released
- Question 4 of 92 marks
A microscope has a ×10 eyepiece lens and a ×40 objective lens. Calculate the total magnification.
Mark scheme
- 10 × 40
- ×400
- Question 5 of 92 marks
Root hair cells have no chloroplasts. Explain why.
Mark scheme
- They are underground, so they get no light
- They cannot photosynthesise, so they do not need chloroplasts
- Question 6 of 92 marks
Explain one way a red blood cell is adapted to carry oxygen.
Mark scheme
- Names a feature: no nucleus, or a disc shape with a dip
- Says how it helps: more room to carry oxygen (accept: more room for haemoglobin), or a large surface area
- Question 7 of 94 marks
Describe how to make a slide of onion cells.
Mark scheme
- Peel a thin layer of onion skin
- Lay it flat in a drop of water on a slide
- Add a stain such as iodine
- Lower a coverslip slowly, at an angle, to avoid air bubbles
- Question 8 of 92 marks
Oxygen moves from the lungs into the blood by diffusion. Explain what diffusion means.
Mark scheme
- Particles spread out or move
- From high concentration to low concentration
- Question 9 of 91 mark
Put these in order, smallest first: organ, cell, organ system, tissue.
Mark scheme
- Cell, tissue, organ, organ system