This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Types of Pesticides – 2”.
1. Which of the following is a flower derived insecticide?
a) Pyrethroid insecticide
b) Acaricides
c) Nematicides
d) Fungicides
View Answer
Explanation: Pyrethroid insecticide is a type of insecticide which has naturally occurring pyrethrins and is derived from a flower named Pyrethrum cineraefolium. These are comparatively safer and they donot have anhy side effects due to its origin from flowers. Whereas, Acaricides is used to control the population of mites, Nematicides are generally used to kill and control the population of nematodes in various places like houses, buildings and agricultural lands and to control Fungus growth, fungicide is used to control the growth.
2. In Pyrethroids, which of the following channel is targeted for imposing toxicity?
a) Sodium
b) Calcium
c) Potassium
d) Iron
View Answer
Explanation: In pyrethroids, sodium channel is usually targeted for imposing the toxicity in pest which usually kills the pest but then they are degraded rapidly, whereas, calcium, potassium or iron channel are usually not targeted. In pyrethroids they usually don’t cause any harm to the environment because they lose its activity upon usage and doesn’t have any side effects of targeting non-targeted organisms.
3. Which of the following is used to prevent germination of fungal spores?
a) Fungicides
b) Insecticides
c) Nematicides
d) Acaricides
View Answer
Explanation: Fungicides are used against fungus, to control the growth of fungus, the protectant category of the fungicides is used to prevent germination of fungal spores by forming a surface deposit on foliage, insecticides are used to kill insects, Nematicides are generally used to kill and control the population of nematodes in various places like houses, acaricides is used to control the population of mites.
4. Eradicants group of Fungicides remove the infection totally.
a) True
b) False
View Answer
Explanation: Fungicides is divided into protectant and eradicants. Eradicants group of Fungicides remove the infection totally by eliminating the fungal growth. But protectant prevent the germination of fungal spores but do not remove them permanently.
5. Which of the following is not used for protection of plants against fungus before the development of synthetic fungicides?
a) Sulphur compound
b) Copper compound
c) Lime sulphur
d) Uranium
View Answer
Explanation: Uranium is a toxic metal, it is radioactive and can cause a great deal of harm to the environment and the surroundings, Sulphur compound or copper compound, lime sulphur which is a mixture of various calcium polysulphides and also, elemental sulphur was used as a protectant against the fungal growth before the advent of synthetic organic based fungicides.
6. Which of the following pesticide degradation methods is harmless for the environment?
a) Microorganisms
b) Chemical methods
c) Physical methods
d) Invertebrates
View Answer
Explanation: If we use invertebrates for pesticide degradation, it will pose a great threat to the life of the organisms and also, they might release the toxic compounds into the environment but microorganisms are biotical method of degradation of the pesticides which do not possess any harm to the environment of other organisms. they do it by metabolic degradation of the pesticides. Chemical method is harmful and physical methods is very tedious and not efficient.
Sanfoundry Global Education & Learning Series – Environmental Biotechnology.
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