Agricultural Entomology - Study Mode
[#416] Which of the following is a secondary pest of storage?
Correct Answer
(D) All of these
Explanation
Solution: Long headed flour beetle, Flat grain beetle and Saw toothed grain beetle is a secondary pests of storage. Flour beetles are secondary pests of all grains and primary pests of flour and other milled products. In grains, embryo or germ portion is preferred. Secondary grain insects feed on broken grain and any powder products left as a result of the broken grain. They construct tunnels as they move through flour and other granular food products. These secondary pests include the Indian meal moth and a variety of beetle species, such as the sawtoothed grain beetle, cigarette beetle, drugstore beetle, the red flour and confused flour beetles.
[#417] The bushy appearance with dead heart in sugarcane at 6 th inter-node is due to
Correct Answer
(B) Top borer
Explanation
Solution: The bushy appearance with dead heart in sugarcane at 6 th inter-node is due to Top borer. Dead heart in sugarcane is a deformed stunted plant of certain crop grasses caused by borer attack on the region immediately behind the growing bud and characterized by bushy blanched distorted growth beyond the damaged area. Presence of the reddish mid-rib tunnel on the crown leaf indicates top-borer infestation. Larva eats away the growing point and thus slender dead heart is formed.
[#418] The newly hatched silk worms are known as
Correct Answer
(D) All of these
Explanation
Solution: The newly hatched silk worms are known as Kegs, Ants and Chawaki. The silkmoth eggs hatch to form larvae or caterpillars, known as silkworms. The young age silkworms are referred as Chawki (India), Kego (hairy silkworms in Japan) and Ants (China). Chawki means the first two stages of silkworm rearing. chawki is the most crucial period of silkworm rearing that demands optimum temperature and humidity, hygienic conditions, quality tender leaf, good rearing facilities and above all technical skills.
[#419] Which of the following pairs is not correctly matched in the term of Spray and Volume median diameter (μm or u)?
Correct Answer
(D) Vapor ⇔ > 400
Explanation
Solution: A. Mist spray is a spray type where volume median diameter is 51 - 100 μm or u. B. Aerosol or fog is a spray type where volume median diameter is 1 - 50 μm or u. C. Smoke is a spray type where the volume median diameter is 0.01 - 1 μm or u. D. The volume median diameter of Vapour is greater than 400 μm or u is not correctly matched.
[#420] Wing is the lateral extension of
Correct Answer
(A) Integument
Explanation
Solution: Wing is the lateral extension of Integument. Insect wings are adult outgrowths of the insect exoskeleton that enable insects to fly. They are found on the second and third thoracic segments, and the two pairs are often referred to as the forewings and hindwings. Each of the wings consists of a thin membrane supported by a system of veins. The membrane is formed by two layers of integument closely apposed, while the veins are formed where the two layers remain separate.