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41.

Exclusion of plant disease by legislation is known as:

A.	Disease resistance	B.	Plant quarantine
C.	Biological control of plant	D.	Cultural control

42.

First of all microscope discovered by:

A.	Needham	B.	Spallanzani
C.	Leeuwenhoeck	D.	Koch

43.

First plant parasitic bacteria was reported by:

A.	T.J. Burrill	B.	Needham
C.	Louis Pasteur	D.	Leeuwenhoek

44.

First plant parasitic nematode discovered was:

A.	Meloidogyne	B.	Heterodera
C.	Anguina	D.	Globodera

45.

First plant parasitic nematode was reported by:

A.	Needham	B.	Spallanzani
C.	Cobb	D.	Mayer

46.

Flag smut of sweat could be controlled by:

A.	Seed treatment with vitavax	B.	Spraying with vitavax
C.	Soil application with vitavax	D.	Above all

47.

Flag smut of wheat is caused by:

A.	Ustilago tritici	B.	Urceystis trlttct
C.	Ustilago hordet	D.	Taphrina deformans

48.

Foot rot of papaya is caused by:

A.	Phytophthora palmivora	B.	Pythium aphanidermatum
C.	Peronospora parasitica	D.	Albugo candida

49.

Fungi, which can grow on living host plant, are called:

A.	Obligate saprophyte	B.	Obligate parasite
C.	Facultative parasite	D.	Saprophytes

50.

Fungi which can grow only on living host plant are called:

A.	Obligate saprophytes	B.	Obligate parasites
C.	Facultative parasites	D.	Saprophytes