Agricultural Entomology - Study Mode

[#606] The glands that help in secretion of lac is
Correct Answer

(C) Resin gland

Explanation

Solution: The gland that helps in the secretion of lac is the Resin gland. Lac is the resinous secretion of several species of lac insects. Thousands of lac insects colonize the branches of the host trees and secrete the resinous pigment through the gland. The coated branches of the host trees are cut and harvested as sticklac. The harvested sticklac is crushed and sieved to remove impurities. The sieved material is then repeatedly washed to remove insect parts and other materials. The resulting product is known as seedlac.

[#607] Which one of the following pair is not correctly matched in the term of Disease and Insect (Vector)?
Correct Answer

(D) Groundnut bud necrosis virus ⇔ Moth

Explanation

Solution: A. Banana bunchy top ⇔ Banana aphid Banana bunchy top is caused by banana bunchy top virus (BBTV), a plant virus transmitted by a small black insect called the banana aphid (Pentalonia nigronervosa). B. Cotton leaf curl ⇔ White fly Cotton leaf curl disease (CLCuD) is a viral infection of cotton and other susceptible host plants that are transmitted by Silverleaf whitefly (Bemisia tabaci). C. Katte disease of cardamom ⇔ Aphid The plants infected by mosaic or Katte can survive for many years and act as the source of inoculum. The virus is transmitted through the aphid vector Pentalonia caladii. D. Groundnut bud necrosis virus ⇔ Moth is not correctly matched. Spread of this virus in peanut/groundnut is mostly monocyclic, and disease incidence in this host depends on infection by thrips, not by moths that acquire the virus from other crops or weed hosts.

[#608] Which one of the following caste of termite is sterile?
Correct Answer

(C) Soldiers

Explanation

Solution: Among the given options soldiers caste of termite is sterile. Castes of termites are primarily divided into two types of individuals: fertile (reproductives) and sterile individuals (neuters). The sterile castes include workers, presoldiers and soldiers, while the fertile ones are alates, primary reproductives and secondary reproductive. Soldier termites have distinctively shaped heads and are typically bigger than workers. Their protruding mandibles help them protect their colonies. Soldiers have elongated bodies and are pale red, light brown, or white.

[#609] Hologastran abdomen is present in
Correct Answer

(A) Cantharidae

Explanation

Solution: Hologastran abdomen is present in Cantharidae. The soldier beetles (Cantharidae) are relatively soft-bodied, straight-sided beetles. They are cosmopolitan in distribution. Soldier beetles often feed on both nectar and pollen as well as predating other small insects. The larvae are often active, velvety, often brightly-colored, and they feed on the ground, hunting snails and other small creatures.

[#610] Intestine in this genus overlaps oesophageal glands in a long lobe
Correct Answer

(D) Rhadinaphelenchus

Explanation

Solution: The intestine in Rhadinaphelenchus genus overlaps oesophageal glands in a long lobe. The red ring disease of coconuts and African oil palms is caused by the nematode Bursaphelenchus cocophilus. It is also identified in literature with an alternative scientific name Rhadinaphelenchus cocophilus. Females have a long post-uterine sac and a rounded tail. Males have seven papillae in the tail region, distinct spicules, and bursa shaped like a spade. Esophageal glands overlap intestine dorsally. Hemizonid is usually present. 3 - 8 annules posterior to excretory pore. Body narrowing abruptly behind vulva.