Agricultural Entomology - Study Mode

[#511] Entire thorax with all its appendages is called as
Correct Answer

(B) Stethidium

Explanation

Solution: The entire thorax with all its appendages is called as Stethidium. The thorax is the midsection (tagma) of the hexapod body (insects and entognathans). It holds the head, legs, wings and abdomen. It is also called mesosoma or cephalothorax in other arthropods. The body is divided into a thorax of three segments and a ten-segmented abdomen.

[#512] Pepper ring spot disease is transmitted by which species of nematode?
Correct Answer

(C) Paratrichodorus minor

Explanation

Solution: Pepper ring spot disease is transmitted by Paratrichodorus minor species of nematode. These are spread by aphids, and some are spread by seed or mechanically. Symptoms of viruses include mosaic patterns on leaves, leaf curling, fruit distortion, overall stunting of the plant, or death. Pepper ringspot virus (PepRSV) becomes radially arranged around mitochondria, which are often distorted, and in cells infected with some TRV isolates, "X-bodies" largely composed of abnormal mitochondria and containing small aggregates of virus particles may be produced.

[#513] Serratia marcesens is . . . . . . . . bacterium which is red pigmented.
Correct Answer

(B) Non-spore forming

Explanation

Solution: Serratia marcesens is Non-spore forming bacterium that is red-pigmented. Serratia marcescens is a species of rod-shaped, Gram-negative bacteria in the family Yersiniaceae. It is a facultative anaerobe and an opportunistic pathogen in humans. Because of its red pigmentation, caused by the expression of the dye prodigiosin and its ability to grow on bread, S. marcescens has been evoked as a naturalistic explanation of medieval accounts of the "miraculous" appearance of blood on the Corporal of Bolsena. S. marcescens was discovered in 1819 by Venetian pharmacist Bartolomeo Bizio, as the cause of an episode of blood-red discoloration of polenta in the city of Padua.

[#514] Juvenile hormone (JH) is a terpene secreted by
Correct Answer

(B) Corpora allata

Explanation

Solution: Juvenile hormone (JH) is a terpene secreted by Corpora allata. Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that regulate many aspects of insect physiology. The first discovery of a JH was by Vincent Wigglesworth. JHs regulate development, reproduction, diapause, and polyphenisms. Juvenile hormones are secreted by a pair of endocrine glands behind the brain called the corpora allata. JHs are also important for the production of eggs in female insects. JH secretion by the corpus allatum is regulated by two neurohormones, the allatotropins that stimulate the secretion and the allatostatins that inhibit synthesis.

[#515] The family of white fly is
Correct Answer

(C) Aleyrodidae

Explanation

Solution: The family of the white fly is Aleyrodidae. Whiteflies are Hemipterans that typically feed on the undersides of plant leaves. They comprise the family Aleyrodidae, the only family in the superfamily Aleyrodoidea. Aleyrodidae is small insects, most species with a wingspan of less than 3 mm and a body length of 1 mm to 2 mm. Adult Aleyrodidae has well-developed antennae, which in most species in this family are seven-segmented. The entire structure is characteristic of the Aleyrodidae and within the family it is taxonomically diagnostic because it varies in shape according to the species.