Agricultural Entomology - Study Mode
[#361] Which pesticide is suitable for controlling the white grub?
Correct Answer
(B) Chlorpyriphos
Explanation
Solution: Chlorpyriphos pesticide is suitable for controlling the white grub. The most effective insecticides are chlorpyriphos or phorate and are recommended for soil application against neonate tiny grubs. The older grubs are hard to control as they move deep into the soil, and the insecticides usually do not penetrate the soil well enough to kill the grubs.
[#362] Emmelocera depresella attack on the roots of
Correct Answer
(D) None of these
Explanation
Solution: Emmelocera depresella attack on the roots of sugarcane is not among the given options. Emmelocera depresella is the only species of borer infesting the underground portion of sugarcane and, hence, referred to by its common name root borer or rootstock borer. Root borer is a major sugarcane pest that occurs in some parts of India and Pakistan. It infests sugarcane at all development stages. Infested crops suffer dead hearts and a general yellowing of the leaves.
[#363] Phase polymorphism is shown by
Correct Answer
(A) Grasshoppers
Explanation
Solution: Phase polymorphism is shown by Grasshoppers. Polymorphism is a discontinuous genetic variation resulting in the occurrence of several different forms or types of individuals among the members of a single species. A discontinuous genetic variation divides the individuals of a population into two or more sharply distinct forms. The steppe grasshopper occurs in four distinct colour morphs that differ in the distribution of green across the dorsal and lateral sides of the body: uniform brown, dorsal green, lateral green, and uniform green. Colour and pattern polymorphism occurs in both sexes.
[#364] Excretion by binucleate cells is found in
Correct Answer
(A) Strepsipterans
Explanation
Solution: Excretion by binucleate cells is found in Strepsipterans. The Strepsiptera are an order of insects with eleven extant families that include about 600 described species. They are endoparasites in other insects. Binucleated cells are cells that contain two nuclei. This type of cell is most commonly found in cancer cells and strepsipterans. Binucleation can be easily visualized through staining and microscopy. In general, binucleation has negative effects on cell viability and subsequent mitosis.
[#365] Tongue unit of honeybee consists of
Correct Answer
(A) 2 galea of maxillae, 2 labial palpi and flexible hairy glossae
Explanation
Solution: Tongue unit of honeybee consists of 2 galeae of maxillae, 2 labial palpi and flexible hairy glossae. The honey bee, Apis mellifera ligustica, uses the specialized tongue structured by ∼120 segmental units, coated by bushy hairs, to dip varying concentrations of nectar flexibly at small scales. The tongue unit consists of two galea of maxillae, two labial palpi and elongated flexible hairy glossa of labium. The glossa terminates into a small circular spoon shaped lobe called spoon or bouton or flabellum which is useful to lick the nectar.