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

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

2. Which country was onion first found?

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

4. Why are they claimed to have medicinal properties?

5. How are onions classified?

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

7. Why are there different coloured onions?