A. Adam Smith
B. Marshall
C. Robins
D. Marks

A. Leaf rust
B. Strip rust
C. Loose rust
D. All the above

A. Producing toxic substances in plants
B. Destroying green pigment of plant
C. feeding on flowers and fruits
D. Absorption of nutrients from plant tissues

A. Fungi
B. Nematodes
C. Virus
D. Bacteria

A. Fungi which cause disease
B. Any bacteria which causes disease
C. Any virus which causes disease
D. Any organism which causes disease

A. Trachea
B. Spines
C. Secretion
D. Nervous system

A. 1-2 nymphs/leaf
B. 2-3 nymphs/leaf
C. 3-4 nymphs/leaf
D. 1 nymphs/leaf

A. Pyrethroid
B. Carbamates
C. Organo-chlorine
D. Organio-phosphate

A. DDT
B. Aldrin and Diehydrin
C. Aindone and Heptachlor
D. All the above

A. Wheat
B. Sugarcane
C. Cotton
D. rice