One onion will typically produce multiple new onions when planted, as each onion bulb contains multiple potential new bulbs. The exact number of onions that will grow from one onion can vary depending on growing conditions and the specific type of onion.
About 120 grams of dried onion.
That would depend on the size of the raw onion!
Have you ever noticed how onions can be many sizes ? 1 chopped onion could be 0.5 cup to about 1.5 cup
The noun onion is a countable noun; one onion or two onions.
1 Heaping Tablespoon
You could use green onions or onion powder.
Onions can be from about 20 gm up to over 400 gm
Depends on what type of onion; for a regular large white onion, I would say one large one would be sufficient. If it's a smaller (e.g. yellow or red) onion you might want to go with 2 or 3 to be sure.
of course. the first year it will bloom and produce seeds and they will grow to be onion seedlings, comercially one grows onion from seed or corms.
For a medium onion, figure about a half cup.
About 3 or 4 yellow onions, depending on your opinion of "medium".
There are 8 chromosomes in an onion egg (or gamete) cell.