Science End-of-Year Revision

Science End Of Year Revision:

Biology

1. Animal and Plant cells 2. Specialized animal and plant cells

3. The 7 life processes:

4. A group of SIMILAR CELLS is called a TISSUE.
A group of DIFFERENT TISSUES forms an ORGAN.
A GROUP OF ORGANS working together from an ORGAN SYSTEM, or even a WHOLE ORGANISM.

CELLS TISSUE ORGAN ORGAN SYSTEM

5. Example of this sequence in plants.

…which, with other tissues make up a leaf (an
ORGAN)…
…which, with other tissues make up a leaf (an
ORGAN)…

…make up palisade
TISSUE…
…make up palisade
TISSUE…
…and leaves and other organs make up a full plan (an
ORGANISM).
…and leaves and other organs make up a full plan (an
ORGANISM).

Palisade
CELLS…
Palisade
CELLS…

6. Definition of DIFFUSION.

Diffusion is the gradual movement of particles from an area of high concentration to an area of low concentration.
THE NATURAL TENDENCY FOR STUFF TO SPREAD OUT.

7. Diffusion of smell.
Smell diffused in the air
Smell diffused in the air
Air

Air

Smell
Smell

8. Why are cell membranes kind of clever?

They’re kind of clever because they hold everything inside the cell, BUT, they let stuff in and out as well. Only very small molecules can diffuse through cell membranes though—things like glucose or amino acids.

9. What will and won’t diffuse through cell membranes?

Big molecules such as STARCH and PROTEINS can’t diffuse through cell membranes.
Small molecules such as GLUCOS and AMINO ACIDS can diffuse through cell membranes.

10. Root Hair Cell

a) Root hairs take in Minerals and Water from the soil
b) The cells on plant roots grow into long ‘hairs’, which stick out into the soil.
This gives the plant a big surface area for ABSORBING water and minerals from the soil.

11. What exactly do enzymes do in the digestive system?

Enzymes act as catalysts to break down big molecules into small ones.

12. 3 different types of enzymes,