Agricultural Entomology MCQ Question and Answer | Agriculture MCQ Question

The number of generations an insect completes in one year in its natural condition is known as Voltinism.
Voltinism is a term used in biology to indicate the number of broods or generations of an organism in a year. The term is most often applied to insects and is particularly in use in sericulture, where silkworm varieties vary in their voltinism.
The number of breeding cycles in a year is under genetic control in many species and they evolved in response to the environment.

a. Paddy gall fly
Rice gall midge is an insect pest of Paddy crop, that causes a tubular gall at the base of tillers, causing elongation of leaf sheaths called onion leaf or silver leaf.
b. Rice bug
Rice bugs can be a significant pest of the rice plant, as they feed on developing (milk stage) grains: reducing crop quality and sometimes yield. Rice bugs damage rice by sucking out the contents of developing grains from the pre-flowering spikelets to soft dough stage, therefore causing unfilled or empty grains and discoloration.
c. Yellow stem borer
The yellow stem borer is a species of moth of the family Crambidae. Early instars bore into the leaf sheath and caused longitudinal yellowish-white patches as a result of feeding resembles white ears.
d. Zig-zig leaf hopper
The rice zigzag leafhopper is found in all rice environments. Feeding damage of zigzag leaf hopper causes the leaf tips to dry up, and whole leaves to become orange and curled.

X lure trap is used for Stored grain pests.
The X-Lure Multi-Species Trap is a reusable insect trap designed for use against dry store pests. Ideal for use in food processing and storage environments, as well as retail stores, homes, education and healthcare environments. This highly attractive trap blends insect pheromones and food attractants for effective results.

Meliodogyne sp. nematode can enter the host in wet soil through lenticels.
Meloidogyne incognita is a plant-parasitic roundworm in the family Heteroderidae. It typically incites large, usually irregular galls on roots as a result of parasitism.
Under favorable conditions (temperature, moisture, host stimulus) the J2 hatches, reaches and penetrates the host root. Root tips are the primary infection court.

a. Paddy is the host plant of yellow stem borer.
The yellow stem borer is a species of moth of the family Crambidae. It invades the stem of the rice plant and stays in the pith to feed on the inner surface of the stem wall.
b. Sugarcane is the host plant of Top borer.
The top borer (Scirpophaga excerptalis) is a major pest of sugarcane in sub-tropical India. It completes five generations in a year.
c. Okra is the host plant of cotton Jassids.
Cotton jassid is a subspecies of leafhopper belonging to the subfamily Typhlocybinae of family Cicadellidae. It is a pest of cotton, okra, and other crops in southern Asia and West Africa.
d. Cabbage is the host plant of Diamond back moth.
The diamondback moth (Plutella xylostella), sometimes called the cabbage moth, is a moth species of the family Plutellidae and genus Plutella. The small, grayish-brown moth sometimes has a cream-colored band that forms a diamond along its back.

First anticoagulant rodenticide is Warfarin.
Anticoagulants, commonly known as blood thinners, are chemical substances that prevent or reduce coagulation of blood, prolonging the clotting time.
One of the first anticoagulants, warfarin, was initially approved as a rodenticide. Warfarin is in a class of medications called anticoagulants ('blood thinners'). It works by decreasing the clotting ability of the blood.

Cholesterol acts as the precursor for ecdysone synthesis.
Ecdysone is the major steroid hormone in insects and plays essential roles in coordinating developmental transitions such as larval molting and metamorphosis through its active metabolite 20-hydroxyecdysone.
Ecdysone, like the vertebrate steroid hormones, is synthesized from cholesterol.

The mustard saw fly (Athalia proxima) lays eggs near Leaf margin.
The mustard sawfly breeds from October to March and undergoes pupal diapause during summer. The adults emerge from these cocoons early in October.
They live for 2 - 8 days and lay 30 - 35 eggs singly, in slits made with saw-like ovipositors along the underside of the leaf margins. Egg period is 4 - 8 days and the larvae feed exposed in groups of 3 - 6 on the leaves during morning and evening.

Nozzle is a part of Hand Compressor sprayer.
The nozzle tip is the most important part of the sprayer. It should deliver a precise amount of spray suspension per minute at a certain pressure in the tank, and maintain a uniform spray pattern and swath width. The selection of the nozzle depends on how the insecticide is to be sprayed.

Thermal energy is utilized for making fog, smoke and vapor sprays.
Thermal foggers have a heated barrel that is prepared for high temperatures using propane gas or electricity.
They use heat to evaporate a fogging solution, which is then sprayed out as fog.