Which is the root knot nematode?
A) Anguina
B) Heterodera
C) Meloidogyne
D) Tylenchorhynchus
Who proved that virus could pass through filters with pores small enough to retain bacteria?
A) Stanley
B) Ivanowski
C) Mayer
D) Barkley
The plant mycoplasmal diseases are transmitted by:
A) Aphids
B) Leaf hoppers
C) Mites
D) Above all
The founder of mycology was:
A) Linnaeus
B) Anton de Bary
C) P.A. Micheli
D) Saccardo
Wilt of arhar is caused by:
A) Verticillium
B) Fusarium
C) Xanthomonas
D) Meloidogyne
The epidermal cells of plant become filled with toxic terpenoid aldehyde after they are few days old and these cells are rarely penetrated by pathogens:
A) Jute
B) Flax
C) Cotton
D) Okra
The organisms included in order Peronosporales cause the disease known as:
A) Rust
B) Smut
C) Downy mildew
D) Powdery mildew
Choose the odd one:
A) Leafspot = Paddy, Pigeonpea
B) Zonate leaf spot = Jawar
C) Red leaf = Sugarcane
D) Leaf blight = Wheat

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