Which of the following is without exception in Angiosperms : -

Options

A. Presence of vessels
B. Double fertilisation
C. Secondary growth
D. Autotrophic nutrition

Answer

B

Explanation

(b) A few plants, (e.g. Rafflesia) are parasitic. Some angiosperm genera are vesselless. Secondary growth does not take place in a larege variety of angiosperms. However, double fertilisation is met with amongstt all angiosperms. In this one male gamete fuses with egg nucleus (n). This is known as syngamy and the second male gamete fuses with the secondary nucleus or polar nuclei (2n). This is known as triple fusion. Together these syngamy and triple fusion is known as double fertilisation.