An incomplete flower with only gynoecium is called a
pistillate flower
The correct option is A.
Explanation of the correct option:
Explanation of the incorrect option:
Option B:
If the flower has only androecium, it is called a staminate flower.
Option C:
If the flower has both gynoecium and androecium, it is called hermaphrodite or bisexual flower.
Option D:
If the flower has both gynoecium and androecium, it is called hermaphrodite or bisexual flower.
Final answer: An incomplete flower with only gynoecium is called a pistillate flower.