B) Nawaschin and Guignard
Correct Answer: B
Solution :In angiosperms one male gamete fuses with the egg to form diploid zygote. This process is called syngamy. The other male gamete fuses with the two polar nuclei to form triploid primary endosperm nucleus. The process is called tiple fusion. These two acts together which is known as double fertilisation. The process was demonstrated by Nawaschin and Guignard in Fritillaria & Lilium. Hence, the correct option is [b].
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