It is the head.
A cauliflower is a flower.
Cauliflower is the flowering part of the plant.
It is part of 'brassica'.
It is a plant in it's own right, not part of anything else.
Flower Condensed inflorescence
No, I believe it's the stalk and leafy part of the plant.
On average, one cauliflower plant can produce one head of cauliflower.
On average, each cauliflower plant can produce one head of cauliflower.
On average, one cauliflower plant can produce one head of cauliflower.
Yes, cauliflower can regrow if you plant the cut stem in your garden, but it may not produce another full head of cauliflower.
Yes, cauliflower does not grow back after being harvested. Each cauliflower plant produces one head of cauliflower, and once it is harvested, the plant does not regrow another head.
Yes, it is a flowering plant.