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Does heterozygous sickle cell anemia give protection against______________?
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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Save for Later ReadThis is a third generation pesticide.
First-generation pesticides included:
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Second-generation pesticides were insecticides including:
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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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Save for Later ReadCochineal insects are used for
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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Save for Later ReadThe process of using a natural predator to control a pathogen is called
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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Save for Later ReadRotenone 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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Save for Later ReadWhich of the following is a biocontrol agent for nematodal diseases?
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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Save for Later ReadTrichoderma harzianum is used for
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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Save for Later ReadWhich of the following is not a biopesticide?
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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Save for Later ReadA biocontrol agent against plant diseases
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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Save for Later ReadWhich of the following is the use of microbes as a biological control agent for pests/diseases?
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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