Agricultural Entomology MCQ Question and Answer | Agriculture MCQ Question

Jowar stem borer causes dead heart in the early stage of crop, redning of sorghum midribs and holes on the whorl of newly opened leaves belonging to family Crambidae.
Jowar stem borer is one of the major pests of Jowar and has a wide distribution. The infestation is noticed till harvest and the grown-up plants when damaged lose their vigour and put forth week ears.
The Crambidae is the grass moth family of lepidopterans. They are variable in appearance, the nominal subfamily Crambinae taking up closely folded postures on grass stems where they are inconspicuous, while other subfamilies include brightly coloured and patterned insects which rest in wing-spread attitudes.

Red cotton bug lay its egg in Soil.
Eggs are laid in the soil near the plants. Lays round eggs on the apical portion of the undersurface of leaves in clusters of 13 - 42 eggs. Larvae emerge from eggs after 3 - 6 days.
Feed on leaves for 16 - 20 days. Adults emerge within 15 - 20 days. The incubation period is 7 days and nymphs become adults in 49 - 90 days. Nymphs and adults suck the sap from tender parts of plants like leaves, petioles and shoots in early stages.

Grubs which feed on the inner content of seed in pulses belong to Callosobruchus chinesis.
Callosobruchus chinensis is a common species of beetle found in the bean weevil subfamily and is known to be a pest to many stored legumes. Other common names include the pulse beetle, Chinese bruchid and cowpea bruchid.
Grubs are the larval or immature form of certain beetle species. These C-shaped critters are white and wrinkly.

The insecticide which is used in mosquito mats is Allethrin.
Allethrin is pyrethroids used almost exclusively to control flying and crawling insects in homes and industrial locations. Used extensively in pet animal shampoos, to treat lice in humans and home and industrial sprays for flying insects, mosquitos, etc.
These insecticides have been shown to pose very low health risks to humans and other mammals, but are toxic to insects and kill them.

New Blue R chemical is used for differentiating between live and dead nematodes.
New Blue R and, in some respects better than Chrysoidin as stains for distinguishing dead from living nematodes regardless of whether the dead nematodes had been killed by lethal amounts of heat, cold, dryness or by certain nematicides.
For nematode ecological work, and in control programmes involving the use of nematicides or hot-water treatment of plant materials, it is often important to know when a nematode is dead.

Sting in worker honey bees is a modified part of Ovipositor.
The ovipositor is a tube-like organ used by some animals, especially insects, for the laying of eggs. In insects, an ovipositor consists of a maximum of three pairs of appendages.
The stingers of the Aculeata (wasps, hornets, bees, and ants) are ovipositors, highly modified and with associated venom glands. The female bees (worker bees and queens) are the only ones that can sting, and their stinger is a modified ovipositor.

Many members of this genus inhabit tunnels of wood-boring beetles where they feed on fungi Bursaphelenchus.
The term woodboring beetle encompasses many species and families of beetles whose larval or adult forms eat and destroy wood. In the woodworking industry, the larval stages of some are sometimes referred to as woodworms.
To develop and reach maturity woodboring beetles need nutrients provided by fungi from outside of the inhabited wood.
Bursaphelenchus is a genus of nematodes (roundworms) in the order Aphelenchida.

Pyralidae family is connected to shoot borer and Sugarcane top borer.
The Pyralidae, commonly called pyralid moths, snout moths or grass moths, are a family of Lepidoptera in the ditrysian superfamily Pyraloidea. The wingspans for small and medium-sized species are usually between 9 and 37 mm (0.35 and 1.46 in) with variable morphological features.
The species Scirpophaga excerptalis, is a borer in the tops of sugarcane. Top shoot borer is a key and most devastating insect pest of sugarcane in sub tropical India. Moths of this insect are silvery white.

Zoraptera is the smallest order of class-Insecta.
The insect order Zoraptera, commonly known as angel insects, contains small and soft bodied insects with two forms: winged with wings sheddable as in termites, dark and with eyes (compound) and ocelli (simple); or wingless, pale and without eyes or ocelli.
They have a characteristic nine-segmented beaded (moniliform) antenna. The members of this order are small insects, 3 millimeters (0.12 in) or less in length, that resemble termites in appearance and their gregarious behavior. They are short and swollen in appearance.

In rats and humans DDT is converted to DDA.
DDD is converted to 2,2-bis(p-chlorophenyl)acetic acid (DDA) via hydroxylation to an acyl chloride intermediate followed by hydrolysis. When applied to soil DDT is digested by bacteria and slowly converted into DDE.
Human health effects from DDT at low environmental doses are unknown. Exposure to high doses, human symptoms can include vomiting, tremors or shakiness, and seizures.
The agility of surviving rats seemed to be permanently reduced. Their speed, coordination, and ability to climb were noticeably diminished from previously observed levels.