Yes there is but they don't look like the brown ones. they are more of a stalk like celery.
Stalk
The Onion
no
Yes a green onion does start out as a seed just like everything else that grows
A green onion grows faster in water because the onion will absorb the nutrients in the water when an onion doesn't even need soil to grow at all.
Leeks taste like a mild, sweet onion. Even more mild than a shallot (not the green onion shallot but the gourmet onion)
its a bulb
You could use green onions or onion powder.
No, they are not. Green onions have a stronger flavor than chives. They are also larger. Some people use them interchangeably, though others are firmly against it. As a general rule of thumb, if a recipe calls for chives and all you have are green onions, use less.
what part of the plant is green onion
Chives ARE the top of green onions. Chives are an herb, yes they are botanically related to onions and have a simliar flavor profile but they are NOT green onions. Green onions/Scallions are a immature regular onion. Sometimes also called spring onions. Depending on the recipe yes, you can substitute green onions for chives, but please make sure to taste, taste, taste as you go. Green onions have a much stronger flavor than chives and you will probably not need the entire amount asked of for chives.
its a bulb
a vegetable