Agricultural Entomology - Study Mode

[#186] Vapour heat treatment and hot air treatments for nematode control was introduces by
Correct Answer

(C) K. Marcinowski

Explanation

Solution: Vapour heat treatment and hot air treatments for nematode control were introduced by K. Marcinowski. Vapour heat treatment is a method of heating fruit with air saturated with water vapour (humidified by injection of steam) at temperatures of 40° - 50°C to kill insect eggs and larvae as a quarantine treatment before fresh market shipment. Vapour heat was developed specifically for nematode and other insect control. Root-knot and foliar nematodes were the most sensitive and were completely eradicated after steaming at 111 degrees Fahrenheit for four hours.

[#187] An important object of the ICZN is to provide
Correct Answer

(D) All of the above

Explanation

Solution: An important object of the ICZN is to provide Uniqueness to scientific names, Stability to scientific names and Distinctiveness to scientific names. The ICZN provides and regulates a uniform system of zoological nomenclature ensuring that every animal has a unique and universally accepted scientific name. The maintenance of international standards in animal nomenclature is the unique role of the Commission.

[#188] Cocoonages of muga silkworm is called as
Correct Answer

(C) Jali

Explanation

Solution: Cocoonages of muga silkworm is called Jali. Muga is an Assamese word which indicates the golden brown (amber) colour of the cocoon.
The Muga silk worm is multivoltne and passes through four moults and five instar stages. Generally, 4 - 5 crops are raised in a year. Muga silkworm is a polyphagous insect. It feeds on the leaves of several kinds of trees, but Machilus bombycine (Vern. som) and Litsaea polyantha (Vern. soalu) are the two principal host food plants of muga silkworm. They are then collected by rearers and put in baskets containing mango twigs and leaves, which are set as cocoonages (Jali) for the spinning of cocoons. The jalies are then hung and left undisturbed in separate rooms or at some shady place till cocoon.

[#189] Erisilkworm is reared on
Correct Answer

(B) Castor

Explanation

Solution: Eri silkworm is reared on Castor. Eri silk (Khasi: Ryndia) is the product of the domesticated silkworm Samia ricini, found mainly in North East India and some parts of China and Japan. It was imported to Thailand in 1974. The name "eri" is derived from the Assamese word "era", which means "castor", as the silkworm feeds on castor plants. The woolly white silk is often referred to as the fabric of peace when it is processed without killing the silkworm. This process results in silk called Ahimsa silk. Moths leave the cocoon and then the cocoons are harvested to be spun.

[#190] Bt brinjal contain which cry toxins against Leptinotarsa decimlineata?
Correct Answer

(A) Cry 3A

Explanation

Solution: Bt brinjal contains Cry 3A cry toxins against Leptinotarsa decimlineata. Bacillus thuringiensis (Bt) is a Gram-positive bacterium that produces insecticidal proteins as crystal inclusions during its sporulation phase of growth, known as Cry or Cyt toxins, which have been proven to be effective against important crop pests and also against mosquitoes that are vectors of human diseases. The primary action of Cry toxins is to lyse midgut epithelial cells in the target insect by forming pores in the apical microvilli membrane of the cells. Cry 3A is fatal, especially against Leptinotarsa decimlineata.