Level of organisation/cell structure Flashcards Preview

IGCSE - Biology > Level of organisation/cell structure > Flashcards

Flashcards in Level of organisation/cell structure Deck (19)
Loading flashcards...
1
Q

What are the different levels of organisation and their order?

A

(In order of size from smallest to largest)

Organelle 
Cells 
Tissues 
Organs 
Organ system
2
Q

What are organelles?

A

Tiny structures within cells

3
Q

What are the typical organelles found in plant cells?

A

Nucleus
Cell membrane
Cytoplasm

4
Q

What is the role of the nucleus?

A

Contains genetic material that controls the cell activities. Its surrounded by its own membrane.

5
Q

What is the role of the cell membrane?

A

Forms the outer shell of the cell and controls the substances that go in and out of the cell.

6
Q

What is the role of the cytoplasm?

A

A gel like substance where most of the cells chemical reactions take place. It contains enzymes which control these reactions.

7
Q

What extra organelles do plant cells have (still contain all animal organelles) ?

A

Chloroplasts
Cell wall
Vacuole

8
Q

What is the role of the chloroplasts?

A

Photosynthesis which makes food for the plant and contains a green substance called chlorophyll.

9
Q

What is the role of the cell walls?

A

A rigid structure made of cellulose which surrounds cell membrane. It supports and strengthens the cell.

10
Q

What is the role of the vacuole?

A

Contains cell sap (a weak solution of sugars and salts). It helps support the cell.

11
Q

What are specialised cells?

A

Specialised so that they carry out a particular function (structures are varied)

12
Q

Give two examples of specialised cells

A

Red blood cells - specialised for carrying oxygen

White blood cells - specialised for defending out body against disease

13
Q

What are tissues?

A

A group of similar cells working together to carry out a particular function

14
Q

Give examples of a tissue

A

Xylem and phloem tissue in plants

15
Q

What can a tissue contain more than one of?

A

A cell type

16
Q

What are organs?

A

A group of different tissues working together to perform a function

17
Q

Give two examples of organs

A
  • Lungs in mammals

- Leaves on plants

18
Q

What is an organ system?

A

Organs working together. Each system does a different job.

19
Q

Give an example of a organ system?

A

The digestive system made up of organs including the stomach, intestine, pancreas and liver.