Pests which only feed and oviposit on crop are called

• major pests

• minor pests

• accidental pests

• occasional pests

Name one frequently used fungicide

• griseofulvin

• chloramphenicol

• cycocel

• ethylene

The father of green revolution in India is

• Calvin

• Haberlandt

• Norman Borlaug

• Swaminathan

In which stage of its life cycle, the silk moth begins to produce silk fibre?

• 3^rd instar larva

• 4^th instar larva

• 5^th instar larva

• Pupa

65.

The vector of the kala-azar is

• Aedes sp

• Anopheles stephenis

• Culex fatigans

• Phlebotomus sp

Which of the following be named for DNA produced from RNA?

• A- DNA

• B- DNA

• C- DNA

• Z- DNA

Which of the following is not a Green-house gas?

• N₂O

• CFC

• O₃

• CO₂

India became a party to 'Convention on biglogical diversity' in the year

• 1994

• 1993

• 1992

• 1988

Increase of BOD in water leads to

• increase in the dissolved O₂ concentration

• decrease in the dissolved O₂ concentration

• maintenance of dissolved O₂ concentration at the same level

• no effect on dissolved O₂ concentration

Freon gas causing stratospheric O₃ depletion is mainly released from

• refrigerator

• automobile

• thermal power plant

• steel industry