1.  A flower in which both male and female parts are present.
2. When the male and female flowers are present in two different plants
3. A flower in which both androecium and gynoecium are absent. 
4. When all the floral whorls are present in a flower. 
5. The unisexual flower having only 
6. Arrangements of flowers on a twig. 
7. Calyx with coloured sepals. 
8. The sepals which fall just at the time of opening of flower. 
9. The short stalk with which the ovule is attached to the ovary wall. 
10. The whorl of floral leaves outside the sepals. 
11. The leaf-like structure present on pedicel between the bract and calyx of a flower.