Agricultural Entomology MCQ Question and Answer | Agriculture MCQ Question

Endosulphan is not an insect hormone. It is a broad-spectrum insecticide that is used to control a variety of pests in agriculture. It acts as a poison, targeting the nervous system of insects, but it is not a naturally occurring hormone in insects.

Ecdysone is a natural insect hormone. It is a steroid hormone that regulates molting and metamorphosis in insects. Ecdysone is responsible for initiating the process of molting, where the insect sheds its old exoskeleton and forms a new one. It is crucial for the growth and development of insects.

Chitin is not an insect hormone. It is a structural polysaccharide found in the exoskeletons of insects and other arthropods. Chitin provides rigidity and protection to the insect's body but does not play a hormonal role in the insect's physiology.

Allethrin is also not an insect hormone. It is a synthetic pyrethroid insecticide commonly used in household insect repellents, such as mosquito coils. It works by disrupting the nervous system of insects, leading to their death, but it is not involved in their growth or development like a hormone would be.

Conclusion:
Ecdysone is the only option that is an example of an insect hormone, playing a key role in molting and metamorphosis, making it the correct answer.

The insect order which is capable of flying in both forward and backward directions is Odonata.
Odonata is an order of flying insects that includes dragonflies and damselflies. These insects characteristically have large rounded heads covered mostly by well-developed, compound eyes, which provide good vision, legs that facilitate catching prey in flight, two pairs of long, transparent wings that move independently, and elongated abdomens.
They have three ocelli and short antennae. The mouthparts are on the underside of the head and include simple chewing mandibles in the adult.

Pest management should be done at the Economic threshold level.
An economic threshold is the insect's population level or extent of crop damage at which the value of the crop destroyed exceeds the cost of controlling the pest.
The pest density at which management action should be taken to prevent an increasing pest population from reaching the economic injury level. EILs are usually expressed as a pest density and are developed from yield-loss relationships.

A. Little bee - Apis florea
Apis florea is unique for its morphology, foraging behavior and defensive mechanisms like making a piping noise. Apis florea has open nests and small colonies, which makes them more susceptible to predation than cavity nesters with large numbers of defensive workers.
B. Indian bee - Apis cerana indica
Apis cerana indica, the Indian honey bee, is a subspecies of Asiatic honey bee. They usually build multiple combed nests in tree hollows and man-made structures. These bees can adapt to living in purpose-made hives and cavities.
C. Giant or rock bee - Apis dorsata
Giant honey bees are the largest of the honey bee species. The Giant honey bee (Apis dorsata) is very large (17 - 20 mm long) however its colour is quite similar to the European honey bee, with golden, black and pale bands on the abdomen and a hairy thorax.
D. Italian bee - Melipona irridipennis is not correctly matched.
Apis mellifera ligustica is the Italian bee. The Italian honey bee is endemic to the continental part of Italy, south of the Alps, and north of Sicily.

Total numbers of cephalic neuromeres are 6.
Neuromeres can be defined as morphologically identifiable transverse subdivisions perpendicular to the longitudinal axis of the embryonic brain and extending onto both sides of the body.
The rostral end of the neural tube forms amesencephalic neuromere and probably six forebrain neuromeres.

Trichoptera is known as water moth.
The caddisflies, or order Trichoptera, are a group of insects with aquatic larvae and terrestrial adults. There are approximately 14,500 described species, most of which can be divided into the suborders Integripalpia and Annulipalpia based on the adult mouthparts.
Trichoptera, or caddisflies, are an order of aquatic insects occurring around the world in rivers, streams, and lakes. About 15,000 species are known.

Sexual trimorphism is seen in the Stag beetle.
Trimorphism is the property exhibited by certain species of having or occurring in three different forms.
Adult male stag beetles have characteristic antler-like mandibles and can grow up to a whopping 75 mm in length. Females have much smaller mandibles and grow between 30 - 50 mm. Both males and females have shiny black heads and thoraxes and brown chestnut-coloured wing cases.

In India Bt cotton was released for commercial cultivation in year 2002.
In 2002, a joint venture between Monsanto and Mahyco introduced Bt cotton to India. India grew the largest GM cotton crop at 10.6 million hectares.
India is the largest producer of cotton, and GM cotton, as of 2014.

Nemagel is a type of Entomo Pathogenic Nematode.
Entomopathogenic nematodes are soft bodied, non-segmented roundworms that are obligate or sometimes facultative parasites of insects.
Entomopathogenic nematodes occur naturally in soil environments and locate their host in response to carbon dioxide, vibration and other chemical cues.

The spotted boll worm is Earias vittella.
Earias vittella, an Asian "spotted bollworm", is a moth species in the family Nolidae. The species was first described by Johan Christian Fabricius in 1794. Most records are from Asia, Australia and certain Pacific islands.
Larvae chew holes into the base of bolls and may hollow out locks. Moist frass usually accumulates around the base of the boll. Larvae may also chew shallow gouges in the boll surface, which can become infected with rot organisms.