Agricultural Entomology - Study Mode
[#566] Symphiogastran abdomen is present in
Correct Answer
(C) Curculionidae
Explanation
Solution: Symphiogastran abdomen is present in Curculionidae. The Curculionidae are a family of weevils, commonly called snout beetles or true weevils. They are one of the largest animal families, with 6,800 genera and 83,000 species described worldwide. Adult Curculionidae can be recognized by the well-developed, downwards-curved snout (rostrum) possessed by many species, though the rostrum is sometimes short.
[#567] Excessive swelling at intersegment of larvae of silkworm, where larvae looks like bamboo cane with distinct nodes is caused by
Correct Answer
(A) Virus
Explanation
Solution: Excessive swelling at inter-segment of larvae of silkworm, where larvae look like bamboo cane with distinct nodes is caused by Virus. It is caused by Bombyx mori Nuclear Polyhedrosis Virus (BmNPV) of the family Baculoviridae. The diseased larvae in the final stage show pronounced swellings at the intersegment resulting in bamboo cane-like appearance of larvae with distinct nodes.
[#568] An alleochemical beneficial to releaser only is called
Correct Answer
(A) Allomone
Explanation
Solution: An alleochemical beneficial to releaser only is called Allomone. An allomone is a type of semiochemical produced and released by an individual of one species that affects the behaviour of a member of another species to the benefit of the originator but not the receiver. Allomones are allelochemicals that evoke in the receiver of the signal a behavioral (releaser effect) or physiological response (primer effect) that is adaptively favourable to the sender but not the receiver.
[#569] The grinding of food in grass hopper is done by
Correct Answer
(D) Gizzard
Explanation
Solution: The grinding of food in grass hopper is done by Gizzard. The gizzard also referred to as the ventriculus, gastric mill, and gigerium is an organ found in the digestive tract of some animals, including archosaurs, earthworms, gastropods, some fish, and some crustaceans. In grasshoppers, the gizzard occurs before the stomach, while in earthworms there is only a gizzard and no stomach.
[#570] Sugarcane root borer damages
Correct Answer
(B) Stem
Explanation
Solution: Sugarcane root borer damages the stem. Polyocha depressella Swinhoe is the only species of borer infesting the underground portion of sugarcane and, hence, referred to by its common name root borer or rootstock borer. It causes yellowing and wilting of leaves. Drying of the entire crown. Affected canes come off easily when pulled. Cause extensive damage to roots and base of shoot. It causes serious economic losses to sugarcane production.