Agricultural Entomology - Study Mode

[#391] Common molluscicide is
Correct Answer

(D) Meta aldehyde

Explanation

Solution: A common molluscicide is Meta aldehyde. Metaldehyde is a molluscicide used in a variety of vegetables and crops in the field, gardens, and greenhouses. It is applied in the form of liquid, granules, sprays, dust, or pelleted/grain bait to kill slugs, snails, and other garden pests.

[#392] In rice, which insect causes yellowing and drying of plant leading to condition known as "hopper burn"
Correct Answer

(A) Brown plant hopper (Nilaparvata lugens)

Explanation

Solution: In rice, Brown plant hopper (Nilaparvata lugens) insect causes yellowing and drying of plant leading to condition known as "hopper burn". The brown planthopper (Nilaparvata lugens) is a planthopper species that feed on rice plants (Oryza sativa L.). BPH infests the rice crop at all stages of plant growth. Due to feeding by both the nymphs and adults at the base of the tillers, plants turn yellow and dry up rapidly. During the early infestation stage, round yellow patches appear, which soon become brownish due to the drying up of the plants. This condition is called 'hopper burn'.

[#393] Body and wings covered by overlapping scales found in order
Correct Answer

(A) Lepidoptera

Explanation

Solution: Body and wings covered by overlapping scales found in order Lepidoptera. Lepidoptera is an order of insects that includes butterflies and moths. About 1,80,000 species of the Lepidoptera are described, in 126 families and 46 superfamilies. The most apparent is the presence of scales that cover the bodies, wings, and a proboscis. The scales are modified, flattened "hairs", and give butterflies and moths their wide variety of colours and patterns. Scales function in insulation, thermoregulation, and producing pheromones.

[#394] Island theory of biological control was given by
Correct Answer

(B) Smith

Explanation

Solution: Island's theory of biological control was given by Smith. The “Father” of modern biological control, Professor Harry Scott Smith, defined it as the use of natural enemies to control insect pests. Biological control is the use of living organisms to suppress pest populations, making them less damaging than they would otherwise be. Natural enemies of insects play an important role in limiting the densities of potential pests. These natural enemies include predators, parasitoids, and pathogens.

[#395] Type of oesophagus, where oesophagus is dorsally lobed is
Correct Answer

(B) Hoplolaimus type

Explanation

Solution: Type of oesophagus, where oesophagus is dorsally lobed is Hoplolaimus type. There is an extensive rostrum at the front of the esophagus in all carnivorous snails and slugs. In the freshwater snail species Tarebia granifera, the brood pouch is above the esophagus. They have a non-muscular or weakly muscled oesophagus. An oesophageal bulb is a specialization and an undifferentiated, gradually enlarging oesophagus more likely represents the primitive type.