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Which of the following is without exception in angiosperms?

1. presence of vessels
2. double fertilisation
3. secondary growth
4. autotrophic nutrition

Correct answer: double fertilisation

Solution

Double fertilisation is a hallmark of angiosperms: one male gamete fuses with the egg to form the zygote, and the other fuses with the polar nuclei to form endosperm. The other options are not universal because vessels, secondary growth, and autotrophic nutrition all have exceptions in angiosperms.

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