Question

Ray florets of sunflower (Compositae) are [AFMC 1981]
A) Bisexual
B) Unisexual
C) Asexual
D) None of these

Answer 1

Ray florets of Sunflower (Compositae) ?

Usually we say Sunflowers are bisexual flowers. That is true about the disc floret variety.  But the Ray floret variety of Sunflowers are unisexual.

 So  (A) is correct.

   The Ray floret Sunflowers are ligulated, incomplete flowers and unisexual. They are zygomorphic and more attractive than the disc floret sunflowers. The Disc floret sunflowers are not ligulated, but are bisexual and complete flowers.

Answer 2

The answer is B(unisexual)
Sunflowers are bisexual flowers. That is true about the disc floret variety. But the Ray floret variety of Sunflowers are unisexual.