Agricultural Entomology - Study Mode

[#126] Which of the following laboratory host is used for the multiplication of egg parasitoids
Correct Answer

(C) Corcyra cephalonica

Explanation

Solution: Corcyra cephalonica is the laboratory host used for the multiplication of egg parasitoids. In India, the rice moth, Corcyra cephalonica (Stainton), is used as the laboratory host of Trichogramma and other biocontrol agents. Eggs of C. cephalonica were found to be superior to other hosts in the quality of mass-reared parasitoids. Biological control is a safer and environmentally sustainable method for managing harmful insect pests, entailing the production and distribution of natural enemies in the ecosystem to control insect populations.

[#127] The year in which destructive insect and pest act was enforced
Correct Answer

(B) 1914

Explanation

Solution: The year in which the destructive insect and pest act was enforced in 1914. Destructive Insects and Pests Act, of 1914 is an act to prevent the introduction into India and the transport from one State to another of any insect, fungus, or another pest, which is or may be destructive to crops. This Act grants the Central Government may the power to levy and collect such fees at such rates and in such manner as may be specified in the 1914 Act for making an application for a permit to import, or for making inspection, fumigation, disinfection, disinfestations or supervision of, any article.

[#128] Bt cabbage is developed against
Correct Answer

(A) Diamond Back Moth

Explanation

Solution: Bt cabbage is developed against Diamond Back Moth. Cabbage plants transformed with a synthetic Bt gene, cry1Ab3, were all resistant to larvae of the diamondback moth, whereas all plants transgenic for cryIIa3, a wild-type Bt gene, were susceptible. The diamondback moth is the most destructive insect pest of brassica crops throughout the world. The moth is most active at night. Economic damage is most severe when heading begins. The caterpillars tunnel into the leaves of the forming heads of cabbages.

[#129] Caudal alae is absent in
Correct Answer

(B) Meloidogyne sp.

Explanation

Solution: Caudal alae is absent in Meloidogyne sp. Meloidogyne incognita, also known as the southern root-nematode or cotton root-knot nematode is a plant-parasitic roundworm in the family Heteroderidae. It typically incites large, usually irregular galls on roots as a result of parasitism. Caudal alae are cuticular extensions on either side of or surrounding, the male cloaca and it is not present in meloidogyne spcies. Females of M. incognita are pear-shaped with no posterior protuberance. Their stylet ranges from 15 - 16 µm long, and knobs are rounded and offset. Perineal pattern is oval to rounded, typically with a high dorsal arch, striae usually wavy, and lateral field absent or weakly demarcated.

[#130] Asymmetrical male genitalia is present which insect order?
Correct Answer

(D) All of these

Explanation

Solution: Asymmetrical male genitalia is present Grylloblatodea, Embioptera and Zoraptera insect order. In insects, on the other hand, genital asymmetry is a widespread phenomenon. An aedeagus is a reproductive organ of male arthropods through which they secrete sperm from the testes during copulation with a female. In some insects the endophallus and the gonopore may be everted through the phallotreme and into the female's bursa copulatrix. Genital lobes referred to as phallomeres form at the sides of the gonopore in the ontogeny of some insects.