A) Presence of vessels
B) Double fertilization
C) Secondary growth
D) Autotrophic nutrition
Correct Answer: B
Solution :
A few plants (.eg, Rafflesia) are parasitic. Some angiosperm genera are vessel-less. Secondary growth does not take place in a large variety of angiosperms. However, double fertilization. Is met with amongst all angiosperms. In this one male gamete fuses first with egg nucleus (n). This is known as syngamy and the second male gamete fuses with the secondary nucleus (2n). This is known as triple fusion. Together both these two syngamy and triple fusion is known as double fertilization.
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