DPP ENTOMOLOGIST PAST PAPER 11-12-2022
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- Malaria
- G6PD
- Thalassemia
- Dengue fever
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Explanation
heterozygous sickle cell anemia gives protection against malaria
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Heterozygotes are therefore more resistant to the debilitating effects of malaria than the normal homozygotes.
sickle cells are also resistant to malaria.
Heterozygotes are resistant to malaria
because of their recessive allele, but they lack sickle cell disease because of their dominant allele
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- Pheromones
- Carbamates and organophosphates
- Pathogens
- Insect Juvenile hormone
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Explanation
First-generation pesticides included:
- organic
- and inorganic molecules.
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Second-generation pesticides were insecticides including:
- Dichlorodiphenyltrichloroethane DDT,
- chlorinated hydrocarbon,
- carbamates
- and organophosphates.
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Third-generation pesticides are far superior to the lead arsenate and DDT that epitomize the two earlier generations.
These chemicals are called juvenile hormones which are made in two small glands in insects' heads.
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ND11-12-2022
- Parthenium control
- Eicchornia prevention
- weeds control
- Cactus prevention
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Explanation
Cochineal insects are used for Cactus prevention
Cochineal insects are more effective in controlling small cactus plants.
It might be necessary to hand-fell large cactus plants
once they are heavily infested with cochineal,
and then leave the cochineal to kill the plant remnants.
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- genetic engineering
- biological control
- confusion technique
- artificial control
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Explanation
When a natural predator (living organism) is applied to the other pathogen organisms to control them, this process is called Biological control
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- bioherbicide
- insect hormone
- natural insecticide
- natural herbicide
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Explanation
Rotenone is a natural compound, used as an insecticide and a herbicide.
It is a commonly used pesticide and is also used in lakes and reservoirs to kill fish that are perceived as pests.
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- Pseudomonas cepacia
- Pisolithus tinctorius
- Paecilomyces lilacinus
- Gliocladium virens
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Explanation
Paecilomyces lilacinus is applied to soil to control nematodes that attack plant roots.
The fungus attacks the nematode through hyphal penetration.
Paecilomyces lilacinus is a naturally occurring fungus found in soils throughout the world.
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- wasteland reclamation
- bioremediation of contaminated soil
- biocontrol agent against plant pathogens
- gene transfer
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Explanation
Trichoderma species promotes the growth of plants and limit the growth of plant pathogens.
Trichoderma species are effective bio fungicides,
enzymatically degrading other fungi,
producing anti-microbial compounds that kill pathogenic fungi,
and out-competing pathogenic fungi for space and nutrients.
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- Nucleopolyhedrovirus
- Xanthomonas campestris
- Bacillus thuringiensis
- Trichoderma harzianum
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Explanation
Xanthomonas campestris is a gram-negative bacterium that causes black rot, the most important disease of vegetable crops.
It is not used as a biopesticide.
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- Trichoderma
- Bacillus thuringiensis
- Glomus
- baculovirus
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Explanation
Biocontrol agents or microbial antagonists prevent infection of the host plant by the pathogen, or establishment of the pathogen in the host plant
The biocontrol fungi, Trichoderma spp., are not only able to control the pathogens causing plant disease,
but can also induce seed germination, and seedling emergence and promote plant growth
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- Bt-cotton to increase the yield of cotton
- Ladybird beetle for controlling aphids in mustard
- Trichoderma sp against plant pathogens
- Nucleopolyhedrovirus against white rust in Brassica
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Explanation
Trichoderma species are widespread filamentous fungi in soils, on plant roots, and on decaying plant residues.
Due to their strong competitiveness and mycoparasitic activity against other fungi.
particular strains of Trichoderma sp. are used in agriculture as biocontrol agents against plant pathogens
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