Agricultural Entomology - Study Mode
[#176] Sting in worker honey bee is a modified part of
Correct Answer
(B) Ovipositer
Explanation
Solution: 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.
[#177] Many members of this genus inhabit tunnels of wood-boring beetles where they feed on fungi
Correct Answer
(C) Bursaphelenchus
Explanation
Solution: 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.
[#178] Pyralidae family is connected to
Correct Answer
Shoot borer
Explanation
Solution: 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.
[#179] In rats and human DDT is converted to
Correct Answer
(C) DDA
Explanation
Solution: 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.
[#180] Match the following columns Column-I (Virus genera) Column-II (Member) a. Badna 1. Potato leaf roll virus b. Luteo 2. Tomato spotted wilt virus c. Poty 3. Potato virus d. Tospo 4. Rice Tungro
Correct Answer
(D) a-4, b-1, c-3, d-2
Explanation
Solution: a. Badna is a member of Rice Tungro. Rice tungro bacilliform virus (RTBV) is a plant pararetrovirus whose DNA genome comprises caulimoviruses, and badnaviruses, etc. Rice tungro disease is caused by the combination of two viruses, which are transmitted by leafhoppers. b. Luteo is a member of potato leaf roll virus. Luteovirus is a genus of viruses, in the family Tombusviridae. There are 13 species in this genus. Plants serve as natural hosts. Luteovirus was given this name due to the symptomatic yellowing of the plant that occurs as a result of infection. c. Poty is the member of potato virus. Potato virus Y (PVY) is a plant pathogenic virus of the family Potyviridae, and one of the most important plant viruses affecting potato production. PVY belongs to the genus Potyvirus, the largest genus of plant viruses and possibly the most destructive one in potato crops. d. Tospo is the member of tomato spotted wilt virus. TSWV is Tomato spotted wilt orthotospovirus belongs to tospo genus which is transmitted by thrips, causes serious losses in economically important crops and it is one of the most economically devastating plant viruses in the world.