Agricultural Entomology - Study Mode
[#326] Onichiform larvae is found in
Correct Answer
(C) Lycaenidae
Explanation
Solution: Onichiform larvae is found in Lycaenidae. Lycaenidae is the second-largest family of butterflies (behind Nymphalidae, brush-footed butterflies), with over 6,000 species worldwide, whose members are also called gossamer-winged butterflies. Larvae are often flattened rather than cylindrical, with glands that may produce secretions that attract and subdue ants. Their cuticles tend to be thickened. Some larvae are capable of producing vibrations and low sounds that are transmitted through the substrates they inhabit.
[#327] From which part of plant, cevadine is extracted?
Correct Answer
(D) Seeds
Explanation
Solution: From the seed part of the plant, cevadine is extracted. The product is produced by grinding the seeds of the plant and subsequent concentration. The seeds contain between 2 and 4% alkaloids. Cevadine is a botanical pesticide obtained from the seeds of the South American lily Schoenocaulon officinale. It acts as a neurotoxin by binding to and preventing the inactivation of voltage-gated sodium ion channels in the heart, nerve, and skeletal muscle cell membranes.
[#328] Pterostigma is present in
Correct Answer
(D) All of these
Explanation
Solution: Pterostigma is present in Odonata, Psocoptera and Raphidioptera. The pterostigma is a group of specialized cells in the outer wings of insects, which are often thickened or coloured, and thus stand out from other cells. The pterostigma is common among the insect orders Odonata, Neuroptera, Psocoptera, Hemiptera and Hymenoptera. It is particularly noticeable in dragonflies, but present also in other insect groups, such as snakeflies and megalopterans.
[#329] Lac research institute is situated at
Correct Answer
(C) Namkum
Explanation
Solution: Lac research institute is situated at Namkum. Indian lac research institute' is situated in Namkum, Ranchi Jharkhand. It had been established in 1924 and is producing good-quality of white lac. The Institute was mandated to focus its attention on crop harvesting and tapping, produce processing, development of products, training, information repository, technology dissemination and liaison with other national and international agencies.
[#330] The damaging stage of gundhi bug
Correct Answer
(B) Nymph and adult stage
Explanation
Solution: The damaging stage of gundhi bug is Nymph and adult stage. Both adults and nymphs do the damage. The nymphs start feeding 3 to 4 hours after hatching. They feed on the leaf sap near the tip / on milky sap in developing spikelets at the milky stage. Sucking of the milky sap causes ill-filled / partially filled and chaffy grains. They omit bad smell hence they are called Gundhi bugs. Serious infestation can reduce the yield by 50%. The straw gives an off-flavour that is unattractive to the cattle.