Agricultural Entomology - Study Mode
[#401] The damaging stage of locust is
Correct Answer
(B) Nymph and adult
Explanation
Solution: The damaging stage of locust is Nymph and adult. Locusts are various species of short-horned grasshoppers in the family Acrididae that have a swarming phase. These insects are usually solitary, but under certain circumstances they become more abundant and change their behaviour and habits, becoming gregarious. Locusts do the most damage at the flowering stage or when they settle on bushes in such large numbers that their weight breaks the branches. These are particularly vulnerable to attack by immature swarms which have a preference for roosting in trees.
[#402] Which one is carbamate insecticide?
Correct Answer
(D) Lindane
Explanation
Solution: Lindane is a carbamate insecticide. Lindane, also known as gamma -hexachlorocyclohexane, Gammallin and benzene hexachloride, is an organochlorine chemical. It is an isomer of hexachlorocyclohexane that has been used both as an agricultural insecticide and as a pharmaceutical treatment for lice and scabies.
[#403] Pinitol - obtained from soybean is effective against
Correct Answer
(D) Rice weevil
Explanation
Solution: Pinitol - obtained from soybean is effective against Rice weevil. Pinitol is a cyclitol, a cyclic polyol. It is a known anti-diabetic agent isolated from Sutherlandia frutescens leaves. Gall plant tannins can be differentiated by their content of pinitol. It was first identified in the sugar pine (Pinus lambertiana). These data suggest that soybean-derived pinitol may be beneficial against Rice weevil.
[#404] Sexual dimorphism is noticed in
Correct Answer
(C) Tylenchulus sp.
Explanation
Solution: Sexual dimorphism is noticed in Tylenchulus sp. Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. Tylenchulus semipenetrans is a dimorphic species that exhibit sexual dimorphism (male and female individuals) at both the juvenile and adult stage.
[#405] Type of mouth parts present in honey bee is
Correct Answer
(B) Chewing and lapping type
Explanation
Solution: Type of mouth parts present in honey bee is Chewing and lapping type. The mouthparts of the honey bee belong to the chewing - lapping type, comprising the glossa, galeae and vestigial labial palp, and they aid the bee in chewing pollen and lapping nectar. They have to lap up nectar and honey and chew pollen balls and wax. Labrum forms the upper lip and labium is large and long and forms a lapping tongue-like structure along with labial palps.