Agricultural Entomology - Study Mode
[#411] "Potato race, tulip race, onion race & daffodil race" refer to this nematode
Correct Answer
(B) Stem & bulb nematode
Explanation
Solution: "Potato race, tulip race, onion race & daffodil race" refer to Stem & bulb nematode. Ditylenchus dipsaci is a plant pathogenic nematode that primarily infects onion and garlic. It is commonly known as the stem nematode, the stem and bulb eelworm, or onion bloat. It is a migratory endoparasite that has a five-stage lifecycle and the ability to enter into a dormancy stage. D. dipsaci enters through stomata or plant wounds and creates galls or malformations in plant growth.
[#412] Mode of action of spiromesifen is
Correct Answer
(C) Inhibitor Lipid biosynthesis
Explanation
Solution: Mode of action of spiromesifen is inhibitor Lipid biosynthesis. Spiromesifen is a novel insecticidal/acaricidal compound derived from spirocyclic tetronic acids that act effectively against whiteflies and mites via inhibition of acetyl-CoA-carboxylase, a lipid metabolism enzyme. It acts on lipid synthesis by inhibiting acetyl CoA carboxylase and causes a significant decrease in total lipids.
[#413] Blood gills are found in
Correct Answer
(D) Both A and B
Explanation
Solution: Blood gills are found in Chironomids and Trichopterans. A blood gill is a gill like structure restricted to organs with spacious lumen and poorly developed/absent trachea, found in larvae of aquatic insects. The functionality of this gill to respiration, and concludes it exists more likely to absorb water. Thin plates or filaments with a copious tracheal supply and only a very small blood cavity, structures which are typically developed in such insects as Trichoptera.
[#414] Example of a primarily wingless insect in which wing buds never develops
Correct Answer
(B) Protura
Explanation
Solution: Example of a primarily wingless insect in Protura is wing buds never develop. Wingless insects are a subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and their evolutionary histories, like silverfish and firebrats. Some species lacking wings are members of insect orders that generally do have wings. Some do not grow wings at all, having "lost" the possibility in the remote past. Some have reduced wings that are not useful for flying.
[#415] The damaging stage of red hairy caterpiller is
Correct Answer
(A) Larva
Explanation
Solution: The damaging stage of red hairy caterpiller is Larva. Amsacta albistriga, the red hairy caterpillar, is a moth of the family Erebidae. It is found in southern India, where it has been recorded feeding on finger millet and sorghum. The wingspan is 40 - 50 mm (1.6 - 2.0 in). The larvae defoliate various crops. It is the destructive stage of the pest. Larval period lasts for 40 - 50 days. Pupation takes place along field bunds or in moist soil at a depth of 10 - 20 cm where they undergo pupal diapause for about 10 - 12 months.