Double fertilization in angiosperms was discovered by:
A. Strasburger
B. Amici
C. Hofmeister
D. Nawaschin
Answer: Option D
Solution (By JKExamLibrary)
Double fertilization in angiosperms was discovered by the Russian botanist Sergei Nawaschin in 1898 in Lilium and Fritillaria. One male gamete fuses with the egg to form the zygote, the other with the secondary nucleus to form the triploid endosperm. Strasburger discovered fertilization in flowering plants, Amici observed pollen tube, Hofmeister studied alternation of generations.
Explanation:
Taeniasis is intestinal infection with adult Taenia solium (pork tapeworm). Cysticercosis is when larvae infect tissues. Ascariasis is roundworm, filariasis nematode, trichinosis Trichinella.
Explanation:
Lymphatic filariasis (elephantiasis) is caused by Wuchereria bancrofti and transmitted by Culex mosquito. Malaria is Anopheles, dengue Aedes, leishmaniasis sandfly.
Explanation:
Nettie Stevens (1905) discovered that sex is determined by the XY chromosomes in beetles. Morgan later confirmed chromosomal theory. Mendel discovered laws of inheritance.
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