Endosperm may be an evolutionary derivative of a second embryo.
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Q56: The great majority of living angiosperms have
Q57: In a carpel, the style connects the
Q58: Unlike gymnosperms, the stored food in angiosperms
Q59: Angiosperms have archegonia but lack antheridia.
Q60: Sporopollenin protects the microgametophyte against UV radiation.
Q62: The pollen tubes of gymnosperms grow faster
Q63: The male germ unit consists of two
Q64: Synergids produce chemicals that attract the pollen
Q65: Perisperm develops from the proliferation of the
Q66: Wet stigmas have a cuticle that contains
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