Science - Cells Flashcards Preview

First Year Science > Science - Cells > Flashcards

Flashcards in Science - Cells Deck (14):
1

Cell Membrane

  • This surrounds the cell.
  • It lets things move in and out of the cell.

2

Nucleus

  • This controls everything that happens inside the cell.

3

Cell Wall

  • A tough wall around PLANT CELLS.It supports the cell.

4

Cytoplasm

  • A liquid where chemical changes happen.

5

Vacuole

  • A space filled with a liquid.Only found in PLANT cells.

6

Chloroplasts

  • Packets of green colour which help a plant make food.

7

Solids

  • Fixed (does not change) shapeFixed volumeHard to squashCannot be pouredGenerally heavy

8

Gases

  • Can flow
  • Easy to squash
  • Volume and shape
  • NOT fixed
  • Light in weight

9

Liquids

  • Takes the shape of its container.
  • Hard to squash.
  • Particles can move freely.
  • Liquids can become SOLIDS.

10

Define: PROPERTY

  • A word to describe how material behaves.
  • What are its 'properties'?
  • e,g soft, hard, strong, heavy, light etc

11

Particles

1. ALL 'Matter' is made of particles.

2. Particles can be different sizes.

3. Particles move by themselves.

4. Particles ATTRACT each other

5. The hotter the substance, the faster the particles MOVE.

6. When particles are heated, they move around 'quickly'

12

Air

Made up of two MAIN gases:

  • Oxygen (21%)
  • Nitrogen (78%)
  • Also carbon dioxide and other gases (1%)

13

Diffusion

When particles SPREAD OUT.

  • For example: Perfume particles MIX in with the air. They are DIFFUSED from the wearer to a persons NOSE!
  • It is dangerous to smoke at a petrol station because GAS PARTICLES from the petrol DIFFUSE. (spread)
  • IF they meet the burning cigarette, there could be an explosion.

14

How cells are adapted for their PURPOSE

  • Examples:Leaf cell - large surface area to absorb light.
  • Nerve cell - They are LONG to connect the BRAIN to the rest of the body.
  • Sperm Cell - Has a long tail to help it SWIM.
  • Root Hair Cell - Has a large surface area to help it absorb minerals and water.