Agricultural Entomology - Study Mode

[#601] Source of Rotenone pesticide is
Correct Answer

(B) Darris elyptica

Explanation

Solution: The source of the Rotenone pesticide is Darris elyptica. Rotenone is produced by extraction from the roots and stems of several tropical and subtropical plant species, especially those belonging to the genera Lonchocarpus and Derris. Rotenone is an odorless, colorless, crystalline isoflavone used as a broad-spectrum insecticide, piscicide and pesticide. It is a commonly used pesticide and is also used in lakes and reservoirs to kill fish that are perceived as pests. Human deaths from rotenone poisoning are rare because its irritating action causes vomiting. Deliberate ingestion of rotenone can be fatal.

[#602] The paralysis of honeybees is caused by
Correct Answer

(D) Virus

Explanation

Solution: The paralysis of honeybees is caused by Viruses. Chronic Bee Paralysis Virus (CBPV), a widespread honey bee RNA virus, causes massive worker bee losses, mostly in strong colonies. Two different syndromes, with paralysis, ataxia and flight incapacity on one hand and black hairless individuals with shortened abdomens on the other, can affect a colony simultaneously.

[#603] The term "third generation pesticides" is given for
Correct Answer

(A) Juvenile hormone

Explanation

Solution: The term "third-generation pesticides" is given to Juvenile hormones. Juvenile hormone (JH) regulates development and reproductive maturation in insects therefore, interruption of JH biosynthesis has been considered as a strategy for the development of target-specific insecticides. Synthetic analogues of the juvenile hormone are used as an pesticide, preventing the larvae from developing into adult insects. JH itself is expensive to synthesize and is unstable in light. At high levels of JH, larvae can still molt, but the result will only be a bigger larva, not an adult.

[#604] Rangi disease of silkworm is caused by
Correct Answer

(A) Serratia marcesens

Explanation

Solution: Rangi disease of silkworm is caused by Serratia marcesens. Serratia marcescens is a species of rod-shaped, Gram-negative bacteria in the family Yersiniaceae. Rangi disease of silkworms is caused by bacteria Serratia marcesens. The bacterial diseases take a heavy toll on silkworm crop under high humidity. In Karnataka, the annual damage caused by this disease is 20 - 40%. The spread and infection of disease are mainly by the consumption of contaminated leaves. The dead larvae release pathogens to the surrounding and many are survived in the environment (airborne) within the rearing house.

[#605] Terrestrial insect, whose excretory product is in the form of ammonia, is
Correct Answer

(D) Cockroach