Year 8 in England

7th grade cells, genetics and evolution

3 7th grade cells, genetics and evolution skills, each with a worked example, free practice that checks every answer, and a printable worksheet. Start with a mixed review, or jump to the skill you need.

Mixed review

Ten questions drawn from every skill below.

Print a review worksheet Riddle puzzle on screen Bingo

Microscopes and magnification

CCSS NGSS.MS-LS1-1England: KS3 Biology: Cells and organisationEngland: KS4 Combined Science: Cell biology

Example

A microscope has a ×10 eyepiece lens and a ×10 objective lens. What is the total magnification?

10 × 10 = 100
So the answer is: ×100

Answer: 100

Builds on: Plant and animal cells

Leads to: Measure tiny things in mm, µm and nm

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Specialised cells

CCSS NGSS.MS-LS1-2CCSS NGSS.HS-LS1-2England: KS3 Biology: Cells and organisationEngland: KS4 Combined Science: Cell biology

Example

Which specialised cell has no nucleus, leaving more room for haemoglobin (hemoglobin)?

Red blood cells have no nucleus and are full of haemoglobin (hemoglobin) to carry oxygen.
So the answer is: red blood cell

Answer: red blood cell

Builds on: Plant and animal cells

Leads to: Stem cells and their medical uses

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Diffusion: how particles spread out

CCSS NGSS.MS-LS1-2CCSS NGSS.MS-PS1-4England: KS3 Biology: Cells and organisationEngland: GCSE Combined Science: Cell biology

Example

Carbon dioxide made by respiring cells moves into the blood. Which way is the gradient?

Cells make carbon dioxide, so it diffuses from cells into the blood.
So the answer is: higher in the cells, lower in the blood

Answer: higher in the cells, lower in the blood

Builds on: The particle model, Plant and animal cells

Leads to: Osmosis and percentage change in mass, Surface area to volume ratio and exchange

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