Multiple Choice QuestionsPests 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
A.
griseofulvin
Fungicides are the chemicals, which kill fungal pathogen. Griseofulvin produced by Penicillium griseofulvum is toxic to several phytopathogenic fungi, such as those causing powdery mildew, rusts, botrytis and others.
Chloramphenicol is an antibiotic that works by stopping the growth of bacteria. It is used to treat bacterial eye infections.
Cycocel is the most widely used plant growth regulators for ornamentals, including bedding plants and herbaceous crops.
Ethylene is an ageing hormone. It helps the developmental processes such as ripening, senescence and abscission. It also regulates many aspects of growth and development of the plant.
In which stage of its life cycle, the silk moth begins to produce silk fibre?
3rd instar larva
4th instar larva
5th instar larva
Pupa
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
Switch
