Agricultural Entomology - Study Mode
[#521] The nematode which causes less damage in soils with high organic contents is
Correct Answer
(C) Lesion nematode
Explanation
Solution: The nematode which causes less damage in soils with high organic contents is the Lesion nematode. Pratylenchus is a genus of nematodes known commonly as lesion nematodes. They are parasitic on plants and are responsible for root lesion disease on many taxa of host plants in temperate regions around the world. Root lesion nematodes (RLN) are microscopic worm-like animals that extract nutrients from plants and soil.
[#522] Two nerve rings are present in
Correct Answer
(D) Both A and B
Explanation
Solution: Two nerve rings are present in Longidorus sp. and Xiphinema sp. Longidorus is a genus of needle nematodes. Some of its species are plant pests. They may also transmit important plant viruses such as the potato virus U or the cacao necrosis virus. Xiphinema is a genus of ectoparasitic root nematodes commonly known as dagger nematodes. They have a long protrusible odontostyle, with 3 basal flanges at the posterior end of the stylet and relatively posterior guiding nerve rings. The two nerve rings of the hypostomal nervous system.
[#523] Structurally and functionally evolved order is
Correct Answer
(B) Hymenoptera
Explanation
Solution: The structurally and functionally evolved order is Hymenoptera. Hymenoptera is a large order of insects, comprising sawflies, wasps, bees and ants. Hymenopterans range in size from very small to large insects, and usually have two pairs of wings. Their mouthparts are adapted for chewing, with well-developed mandibles. Females typically have a special ovipositor for inserting eggs into hosts or places that are otherwise inaccessible. This ovipositor is often modified into a stinger. The young develop through holometabolism that is, they have a wormlike larval stage and an inactive pupal stage before they mature.
[#524] The insect family whose larvae are called 'Flat headed borers' is
Correct Answer
(C) Buprestidae
Explanation
Solution: The insect family whose larvae are called 'Flat headed borers' is Buprestidae. Buprestidae is a family of beetles known as jewel beetles or metallic wood-boring beetles because of their glossy iridescent colors. Larvae of this family are known as flatheaded borers. The elytra of some Buprestidae species have been traditionally used in beetlewing jewellery and decoration in certain countries in Asia, like India, Thailand and Japan.
[#525] Most serious pest of wheat is
Correct Answer
(A) Termite
Explanation
Solution: Most serious pest of wheat is Termite. Termites damage the crop soon after sowing and sometimes near maturity. They feed on roots, the stem of growing plants, and even dead tissues of plant feeding on cellulose. The damaged plants dry up completely and are easily pulled out. The plants damaged at later stages give rise to white ears.