Agricultural Entomology - Study Mode
[#301] Which is also known as Grylloblattodea?
Correct Answer
(D) All of these
Explanation
Solution: Notoptera, Ice crawlers and Rock crawlers are also known as Grylloblattodea. Grylloblattidae, commonly known as the icebugs, or ice crawlers, is a family of extremophile and wingless insects that live in the cold on top of mountains and the edges of glaciers. They belong, along with Mantophasmatidae (rock crawlers), to the order Notoptera. These are wingless insects mostly less than 3 cm long, with a head resembling that of a cockroach, with long antennae and elongated cerci arising from the tip of their abdomen. They cannot tolerate warmth (most species will die at 10°C) and many species have small distribution ranges.
[#302] Dipteran parasitoid attacking larvae of Helicoverpa armigera is
Correct Answer
(B) Carcelia sp.
Explanation
Solution: Dipteran parasitoid attacking larvae of Helicoverpa armigera is Carcelia sp. Carcelia is a genus of flies in the family Tachinidae. Dipteran parasitoids in the insect order Diptera include an estimated 16,000 species, or approximately 20% of the total number of species with this life-style. Helicoverpa armigera is a species of Lepidoptera in the family Noctuidae The larvae feed on a wide range of plants, including many important cultivated crops.
[#303] Connecting link between annelida and arthropoda is
Correct Answer
(D) Peripatus
Explanation
Solution: Connecting link between Annelida and arthropoda is Peripatus. Peripatus is a genus of velvet worms in the Peripatidae family. The name "peripatus" is also used to refer to the Onychophora as a whole, although this group comprises many other genera besides Peripatus. It is the connecting link between Annelida and arthopoda which means it has characteristics of both of them. Segmented bodies and thin cuticles like Annelida also have tracheal respiration and open respiratory system like arthopods. This genus is viviparous, with mothers supplying nourishment to their embryos through a placenta.
[#304] Which one of the following is the example of insect hormone?
Correct Answer
(B) Ecdysone
Explanation
Solution: Endosulphan is not an insect hormone. It is a broad-spectrum insecticide that is used to control a variety of pests in agriculture. It acts as a poison, targeting the nervous system of insects, but it is not a naturally occurring hormone in insects. Ecdysone is a natural insect hormone. It is a steroid hormone that regulates molting and metamorphosis in insects. Ecdysone is responsible for initiating the process of molting, where the insect sheds its old exoskeleton and forms a new one. It is crucial for the growth and development of insects. Chitin is not an insect hormone. It is a structural polysaccharide found in the exoskeletons of insects and other arthropods. Chitin provides rigidity and protection to the insect's body but does not play a hormonal role in the insect's physiology. Allethrin is also not an insect hormone. It is a synthetic pyrethroid insecticide commonly used in household insect repellents, such as mosquito coils. It works by disrupting the nervous system of insects, leading to their death, but it is not involved in their growth or development like a hormone would be. Conclusion: Ecdysone is the only option that is an example of an insect hormone, playing a key role in molting and metamorphosis, making it the correct answer.
[#305] The insect order which is capable of flying in both forward and backward direction is
Correct Answer
(A) Odonata
Explanation
Solution: The insect order which is capable of flying in both forward and backward directions is Odonata. Odonata is an order of flying insects that includes dragonflies and damselflies. These insects characteristically have large rounded heads covered mostly by well-developed, compound eyes, which provide good vision, legs that facilitate catching prey in flight, two pairs of long, transparent wings that move independently, and elongated abdomens. They have three ocelli and short antennae. The mouthparts are on the underside of the head and include simple chewing mandibles in the adult.