Flowering is that the stamens and pistils are ___________ after the calyx and corolla open immediately.
A. dried
B. exposed
C. died
D. fertilized
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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
Do all fruits have seeds?
A. Yes
B. Not always
C. Sure
D. At least one seed
What kind of situation the fruit has no seed?
A. Double fertilization
B. Grafting
C. Parthenocarpy
D. Apomixis
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