Agricultural Entomology MCQ Question and Answer | Agriculture MCQ Question

In plants and mosquito larvae DDT is converted to DDD.
Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless, tasteless, and almost odorless crystalline chemical compound, an organochloride.
DDE and DDD form when DDT breaks down. These chemicals can evaporate into the air from water and moist soil and may then be carried to locations very far from the source. They can be removed from the air by rain and snow or be broken down by sunlight.

GEP of the pest coincides with ETL, then the pest belongs major pest category.
The economic threshold Level (ETL) is the population density at which control measures should be determined to prevent an increasing pest population from reaching the Economic injury level. EIL is the lowest pest population which will cause economic damage.
These are pests with the population crosses EIL quite frequently and require repeated control measures to avoid economic damage, The Damage is >10%. GEP lies very close to EIL or coincides with EIL e.g. Cotton jassid, Rice stem borer.

High moisture favours the attack of Heterodera sp. nematode.
Heterodera is a genus of nematodes in the family Heteroderidae. Members of the genus are obligate parasites and different species attack different crops, often causing great economic damage.
The genus is unique among nematode genera because of the ability of the female to transform into a tough, brown, cyst that protects the eggs which have been formed within her body.

The pronotum is ideally seen in the Cockroach insect.
The pronotum is a prominent plate-like structure that covers all or part of the thorax in cockroach. The pronotum covers the dorsal surface of the thorax.
It is a section of the thorax that lies in front of the sections that bear the legs and wings.

Metarrhizium anisopiliae is targeted against sugarcane pyrilla and rhinoceros beetle and is commercially available under the trade name Biomax.
It is a fungus that grows naturally in soils throughout the world and causes disease in various insects by acting as a parasitoid.
The fungus then develops inside the body, eventually killing the insect after a few days, this lethal effect is very likely aided by the production of insecticidal cyclic peptides.

The holes at the base of sorghum peduncle are due to Chilo partellus.
Chilo partellus, the spotted stalk borer or spotted stem borer, is a moth in the family of Crambidae. C. partellus attacks several grass species which can be both cultivated and wild. Cultivated crop hosts include but are not limited to maize, sorghum, pearl millet, rice and sugarcane.
The first indication of stem borer infestation is the appearance of small elongated windows or round holes due to feeding by the young larvae. These damage symptoms on the leaves appear in 15 to 25 days old crops.

Scutellonema genus has enlarged phasmids but is situated not opposite to each other.
Scutellonema is a genus of nematodes belonging to the family Hoplolaimidae. Nematodes of the genus Scutellonema are characterized by scutella (enlarged phasmids) in the lateral fields.
The scutella are opposed (at the same location on either side of the body) and are located close to the level near the anus.

Important trisaccharides present in insect blood is Melisitose.
Melezitose, also spelled melicitose, is a nonreducing trisaccharide sugar that is produced by many plant sap eating insects, including aphids such as Cinara pilicornis, by an enzyme reaction.
This is beneficial to the insects, as it reduces the stress of osmosis by reducing their water potential. It can be partially hydrolyzed to glucose and turanose the latter of which is an isomer of sucrose.

The spider, ticks and mites belong to the Arthropod class Arachnida.
Arachnida is a class of joint-legged invertebrate animals, in the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons.
The term is derived from the Greek word (Arachne, 'spider'), from the myth of the hubristic human weaver Arachne, who was turned into a spider.
Adult arachnids have eight legs attached to the cephalothorax, although the frontmost pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs.