Agricultural Entomology - Study Mode

[#191] Type of sense organ which is found in leg joints and wing bases is
Correct Answer

(B) Scolopale cell

Explanation

Solution: The type of sense organ which is found in leg joints and wing bases is Scolopale cell. A scolopidium is the fundamental unit of a mechanoreceptor organ in insects. It is a composition of three cells: a scolopale cap cell which caps the scolopale cell, and a bipolar sensory nerve cell. It is found in all insect's legs, and the probably an evolutionary artifact of prior insect body types which used their legs to detect vibrations from the substrate.

[#192] Kerala wilt (coconut root wilt) in coconut is transmitted by
Correct Answer

(D) Tingid bug

Explanation

Solution: Kerala wilt (coconut root wilt) in coconut is transmitted by Tingid bug. Root (wilt) disease (RWD) caused by phytoplasma is one of the most devasting diseases of coconut palms. The major symptoms of the disease in leaves are wilting and drooping and flaccidity, ribbing, paling/yellowing, and necrosis of leaflets. Phytoplasmal diseases are usually transmitted by insects, and this wilt disease is transmitted by tinged bugs. These bugs are usually host-specific and can be very destructive to plants. Most feed on the undersides of leaves by piercing the epidermis and sucking the sap.

[#193] Acerophagus papaya is a parasitoid on papaya mealy bug, which is imported from?
Correct Answer

(C) Puertorica

Explanation

Solution: Acerophagus papaya is a parasitoid on papaya mealy bug, which is imported from Puertorica. The National Bureau of Agriculturally Important Insects (NBAII), Bangalore took efforts in importing three exotic papaya mealy bug parasitoids such as Acerophagus papayae , Pseudleptomastix mexicana and Anagyrus loecki from Puerto Rico in July 2010.

[#194] Plague is transmitted by
Correct Answer

(A) Xenopsylla cheopsis

Explanation

Solution: Plague is transmitted by Xenopsylla cheopsis. Plague is an infectious disease caused by the bacteria Yersinia pestis, a zoonotic bacteria, usually found in small mammals and their fleas. Plague is caused by the bacteria Yersinia pestis, a zoonotic bacteria usually found in small mammals and their fleas. The infection is usually transmitted within murine populations and then to humans by bites from infected fleas. The oriental rat flea, Xenopsylla cheopis, is considered the most efficient plague vector.

[#195] The stage of silk worm when it synthesizes silk is
Correct Answer

(D) Both A and B

Explanation

Solution: The stage of silk worm when it synthesizes silk is IV th instar larvae and V th instar larvae. The life cycle of mulberry silkworm completes in 45 - 55 days, consisting of stages egg, larva, pupa and moth. The egg stage is lasting for 9 - 10 days, a larval stage is 24 - 28 days, the pupal stage 8 - 10 days, and the moth stage 3 - 4 days. The female silkmoth lays 300 to 500 eggs. The silkmoth eggs hatch to form larvae or caterpillars, known as silkworms. The larvae feed on mulberry leaves. Having grown and moulted several times, the silkworm extrudes a silk fibre and forms a net to hold itself.