Most have the following parts - make sure you know them all:
1. Plasma membrane - holds the cell together and controls what goes in and out.
2. Cytoplasm - gel-like substance where most of the chemical reactions happen. It contains enzymes that control these chemical reactions.
3. Nucleus - contains genetic material that controls the activities of the cell.
4. Mitochondria - where most of the reactions for respiration take place. Respiration releases energy hat the cell needs to work.
5. Ribosomes - where proteins are made in the cell.
They usually have all the bits that animal cells have, plus...
1. Rigid cell wall - made of cellulose. It supports and strengthens the cell.
2. Permanent vacuole - contains cell sap, a weak solution of sugar and salts.
3. Chloroplasts - where photosynthesis occurs, which makes food for the plant. They contain chlorophyll.
- Chloroplasts are surrounded by a double membrane, and also have membranes inside called thylakoid membranes. These membranes are stacked up in the chloroplast to form grana.
- Grana are linked together by lamellae - thin, flat pieces of thylakoid membrane
- Some parts of photosynthesis happen in the grana, and other parts in the stroma (a thick fluid found in chloroplasts).
In an exam...
You might get a question where you need to apply your knowledge of organelles to explain why its particularly suited to its function...
Think about where the cell's located in a plant - if it's exposed to light, then it's have lots of chloroplasts to maximise photosynthesis.
Think about what the cell needs to do its job - if the cell uses a lot of energy, it'll need lots of mitochondria. If it makes lots of proteins, it'll need lots of ribosomes.
Good luck on your exams!