Carrots! No sticks!

[kutsuwamushi.livejournal.com]

Usage questions about морковь.

One English-Russian dictionary defines the word морковь as meaning "carrots (collectively)." I'm guessing that they mean it's a mass noun, like "bread" in English. It seems to indicate that there's no plural, although that just may be because it's not an exhaustive dictionary.

Another dictionary lists морковь as both "carrots" and "a single carrot" and has no special notes about its usage other than that it's feminine.

Does this word have plural forms?

Is it just context that tells you whether you mean carrots as a whole or a single carrot, or is the word inflected/used differently?

How would you say that you need to buy three carrots?

Edit: Thanks, everyone!