What structures of flowers are involved in the formation of false fruits?
A. Receptacle
B. Perianth
C. Stamen
D. Ovary
查看答案
The bioenergy is also called clean energy because it doesn't produce_________.
A. exhaust gas
B. oxygen
C. hydrogen
D. nitrogen
Flowering is that the stamens and pistils are ___________ after the calyx and corolla open immediately.
A. dried
B. exposed
C. died
D. fertilized
What is the bract ?
A. The leaf-shaped structure outside an inflorescence
B. The leaf-shaped structure in an inflorescence
C. The leaf-shaped structure outside a stamen
D. The leaf-shaped structure outside a pistil
What is inflorescence ?
A. The irregularly arrange of flowers on the flower axis
B. The regularly arrange of flowers on the flower axis
C. A flower on the petiole
D. A flower on a branch
微信支付 
支付宝支付