What are things about onions? (What we need to know)

1. Why are they claimed to have medicinal properties?

2. Why are the 'flesh' of onions arranged in layers?

3. How are onions classified?

4. Which country was onion first found?

5. Why are onions' 'flesh' white in colour?

6. Why are there different coloured onions?

7. Is the bulb of onion made up of starch?