Agricultural Entomology - Study Mode
[#321] Which of the following insects is an efficient pollinator?
Correct Answer
(C) Bumble bee
Explanation
Solution: Bumble bee is an efficient pollinators. The bumblebee is a more efficient pollinator at the individual level. It provides highly valued pollination services for a wide variety of crops and ranks as the most frequent single species of pollinator for crops worldwide. Bumblebees are important pollinators of both crops and wildflowers. Bumblebees are increasingly cultured for agricultural use as pollinators, among other reasons because they can pollinate plants such as tomato in greenhouses by buzz pollination.
[#322] All known PPN nematodes possess
Correct Answer
(C) Stylet
Explanation
Solution: All known PPN nematodes possess Stylet. A stylet is a hard, sharp, anatomical structure found in some invertebrates. The word stylet or stomatostyle is used for the primitive piercing mouthparts of some nematodes. In these groups, the stylet is a hardened protrusible opening to the stomach. These stylets are adapted for the piercing of cell walls and usually function by providing the operative organism with access to the nutrients contained within the prey cell.
[#323] Pharoschimnus horni is a
Correct Answer
(A) Coccinelid predator
Explanation
Solution: Pharoschimnus horni is a Coccinelid predator. Coccinellidae is a widespread family of small beetles. Many of the species have conspicuous aposematic colours and patterns, such as red with black spots, that warn potential predators that they are distasteful. Coccinellids are best known as predators of Sternorrhyncha such as aphids and scale insects. Most predatory coccinellids include other items in their diets, such as honeydew, pollen, plant sap, nectar and fungi.
[#324] Bunchy top appearance in grown up sugarcane due to formation of side shoots is caused by
Correct Answer
(B) Top shoot borer (Scirpophaga nivella)
Explanation
Solution: Bunchy top appearance in grown-up sugarcane due to the formation of side shoots is caused by Top shoot borer (Scirpophaga nivella). The top shoot borer is a major pest of sugarcane in sub-tropical India. It completes five generations in a year. The presence of the reddish mid-rib tunnel on the crown leaf indicates a top-borer infestation. Larva eats away the growing point and as a result of fourth brood attack side shoots develop and give an appearance of a bunchy top.
[#325] Trophamnion is found in which type of reproduction?
Correct Answer
(A) Polyembryony
Explanation
Solution: Trophamnion is found in Polyembryony type of reproduction. Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg. Due to the embryos resulting from the same egg, the embryos are identical to one another but are genetically diverse from the parents. Trophamnion is a nutritive sheath that sometimes invests the embryonic portion of the insect egg especially in polyembryonic insects. It is a giant unicellular provisory structure derived from the second polar body and performs both protective and digestive functions.