Agricultural Entomology - Study Mode

[#381] Which one of the following pair is not correctly matched in the term of Insect and Scientific name?
Correct Answer

(B) Pulse beetle ⇔ Helicoverpa armigera

Explanation

Solution: A. Rice weevil ⇔ Sitophilus oryzae Sitophilus oryzae is also called Rice weevils. These insects are cosmopolitan in distribution and have originated in Far East region. They can exist anywhere where physical conditions for growth are favourable and the grain is left undisturbed for some time. B. Pulse beetle ⇔ Helicoverpa armigera is not correctly matched. The pulse beetle, scientifically known as Bruchus chinensis, is a serious pest of stored food grains and causes damage to cowpea, gram, soybean, and pulses. This pest is distributed worldwide and is commonly found in India. C. Lesser grain borer ⇔ Rhizopertha dominica Rhyzopertha dominica, is known commonly as the lesser grain borer, American wheat weevil, Australian wheat weevil, and stored grain borer. It is a beetle commonly found within store bought products and pest of stored cereal grains located worldwide. D. Khapra beetle ⇔ Trogoderma granarium The khapra beetle (Trogoderma granarium), also called cabinet beetle, which originated in South Asia, is one of the world's most destructive pests of grain products and seeds. It is considered one of the 100 worst invasive species in the world.

[#382] Specific strain of species adapted to a particular set of environment is called as
Correct Answer

(B) Ecotype

Explanation

Solution: Specific strain of species adapted to a particular set of the environment is called an Ecotype. An ecotype is a variant in which the phenotypic differences are too few or too subtle to warrant being classified as a subspecies. These different variants can occur in the same geographic region where distinct habitats such as meadow, forests, swamps, and dunes provide ecological niches. An ecotype is different than a subspecies, which may exist across several different habitats. In animals, ecotypes owe their differing characteristics to the effects of a very local environment.

[#383] The microorganism which helps in degradation of fenitrothion is
Correct Answer

(D) Bacillus subtilis

Explanation

Solution: The microorganism which helps in degradation of fenitrothion is Bacillus subtilis. Fenitrothion is a phosphorothioate insecticide that is inexpensive and widely used worldwide. The soil bacteria Bacillus subtilis, converted more than half of radiolabelled 32P fenitrothion to the amino analogue under aerobic conditions at 37°C in 24 hours. Fenitrothion is gradually inactivated by other bacterial species including gram-positive and gram-negative rods, but not by fungi and yeasts.

[#384] In which insect lipid absorption occurs through crop?
Correct Answer

(C) Cockroach

Explanation

Solution: In Cockroach insects lipid absorption occurs through crops. Crop in the foregut, is used to store food and is present in the forefoot of the alimentary canal. In many insects absorption of nutrients occurs through microvilli of midgut epithelial cells by diffusion. Absorption of water and ions occur through rectum.

[#385] Match the following columns Column-I (Nematode) Column-II (Disease) a. Tylenchulus semipenetrans 1. Soybean root rot b. Pratylenchus thornei 2. Root rot of citrus c. Meloidogyne incognita 3. Root rot of Tobacco d. M. incognita and Heterodera glycines 4. Potato wilt
Correct Answer

(D) a-4, b-3, c-2, d-1