Every card in Cells and organisation, Year 7: more practice
The whole deck, in order — so you can read it through before your child ever sees it.
- What do we call a group of similar cells that work together to do one job?
A tissue
HintIt sits between a single cell and a whole organ in size.
WhyMuscle tissue is made of muscle cells that all contract. Different tissues then combine to form an organ such as the stomach.
- What do we call a group of organs that work together to carry out a major job in the body?
An organ system
HintYour stomach and gut belong to one such group.
WhyThe heart, blood vessels and blood form the circulatory system. Systems working together make up the whole organism.
- What is the jelly-like substance inside an animal cell, where many chemical reactions happen, called?
The cytoplasm
HintIt fills the space between the cell membrane and the nucleus.
WhyCytoplasm is mostly water. Many of the cell's chemical reactions happen in it, and the other parts of the cell are held in it.
- Which three parts does a plant cell have that an animal cell does not?
Cell wall, chloroplasts and a large permanent vacuole
HintOne part supports, one catches light and one is full of sap.
WhyThe wall gives support, the chloroplasts carry out photosynthesis and the vacuole stores cell sap and keeps the cell firm.
- How does the long, thin shape of a nerve cell help it do its job?
It can carry electrical messages over long distances around the body
HintThink about what the cell must reach.
WhyNerve cells carry electrical impulses between the brain and the rest of the body. Their long fibres let one cell link places far apart.
- Muscle cells contain a large number of mitochondria. Why?
They release lots of energy for the muscle to contract
HintThink about the fuel a working fibre needs.
WhyMitochondria are where respiration releases energy. A muscle cell that contracts again and again needs a plentiful supply.
- You can smell dinner cooking from another room. Which process spreads the smell through the air?
Diffusion
HintParticles spread out from where there are lots of them.
WhyScent particles leave the food, where they are crowded, and move randomly into the rest of the air where there are few.
- What happens to the rate of diffusion when the temperature rises, and why?
It speeds up because the particles move faster
HintThink about what warmth does to how fast tiny pieces travel.
WhyAt higher temperatures particles have more kinetic energy, so they spread out faster. This is why a smell reaches you sooner in a warm room.
- A cell is 0.05 mm long. In a drawing it is 5 mm long. What is the magnification? (number only)
100
HintDivide the drawing size by the real size.
WhyMagnification = image size ÷ real size = 5 ÷ 0.05 = 100, written ×100.
- A photograph of a cell is 40 mm long and the magnification is ×50. What is the real length of the cell?
0.8 mm
HintRearrange the formula so the real size is the subject.
WhyReal size = image size ÷ magnification = 40 ÷ 50 = 0.8 mm.
1★ KS3-BIOL-CEL-0039
2★ KS3-BIOL-CEL-0040
3★ KS3-BIOL-CEL-0041
4★ KS3-BIOL-CEL-0042
5★ KS3-BIOL-CEL-0043
6★ KS3-BIOL-CEL-0044
7★ KS3-BIOL-CEL-0045
8★ KS3-BIOL-CEL-0046
9★ KS3-BIOL-CEL-0047
10★ KS3-BIOL-CEL-0048
Keep what you learn
Here, nothing is saved. In your child’s own sky every card is scheduled — it comes back just before they’d forget it — and the professor who wrote it is one tap away.