What does onion need for growing?

You can see that  onion`s leaves start growing sometimes in a warm room.
We can do a tasty salad rich in vitamins from it.

What  can we do to make  onion`s leaves  grow  more quicly?

Take an onion, a glass of water,   and a cardboard.

1. Draw  a big circle on the cardboard ( use the same   glass) 
2. Draw  a smaller circle (use the  glass bottom) .
3. Cut  both circles out .Put   an onion on the circles.  
4. Now put the onion with the circles in the water.Look at the picture!
4. Watch how the onion`s leaves grow!

5. What does an onion need for growing?...................................................................................... ...........................................................................................................................

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