You can use colour adjectives and the verb “to be” to answer this common questions:
What colour is it?
Example: What colour is this box? This box is blue.
What colour are these carrots?
1)These carrots .
2)What colour that pot? 3)That pot .
4)What colour this ball? 5)This ball is and 6) .
7)What colour these grapes? 8)These grapes .