Question 2
What is the function of the calyx?
The right answer is the one marked above.
Protecting the inner floral parts at the bud stage. That is the whole of its work, and it is why the calyx is green rather than coloured.
Attracting insects is the corolla's extra job — it protects the bud too. Producing pollen belongs to the anther and receiving it to the stigma, neither of which is part of the calyx.