Learn Dutch: Hebben jullie planten in de kamer? - Do you have plants in the room?

The singular word for 'plant' is just plant. To make it plural, we simply add the regular suffix -en, creating planten. This is the most common way to make plural nouns in Dutch!

Why does the sentence start with Hebben instead of jullie?

In Dutch yes/no questions, the verb and the subject swap places. Because this is a question, the verb Hebben (have) moves to the very front, before the subject jullie (you).

Can I use jij instead of jullie here?

You would use jij (or je) if you are asking just one person, but notice how the verb changes: Heb jij planten in de kamer?. The word jullie is used here because the speaker is asking multiple people at once, like 'you all'.

Does de kamer refer to a specific room?

Kamer means 'room'. While it can refer to any room in a house, when Dutch speakers say de kamer by itself, they very often mean the living room (which is short for woonkamer).