Agricultural Entomology MCQ Question and Answer | Agriculture MCQ Question

In nematode, tylenchids stylet develops from Buccal wall.
This stylet is used to pierce the cell wall to inject secretions into the plant cell or to ingest nutrients from the cytoplasm.
It also serves to pierce and cut openings in the cell walls and to release secretions that dissolve or weaken the cell wall or middle lamella.

Meloidogyne incognita is root-knot nematode species perennial pattern in nature and distinctly marked by the presence of lateral ridges.
Meloidogyne incognita, also known as the southern root-nematode or cotton root-knot nematode is a plant-parasitic roundworm in the family Heteroderidae.
This nematode is one of the four most common species worldwide and has numerous hosts. It typically incites large, usually irregular galls on roots as a result of parasitism.

Cement layer is absent in Honeybees insects.
Epicuticle is the outermost layer that is usually thin and has a cement-like chitin-lacking structure.
In many insects a cement layer covers the wax and protects it from abrasion. In many insects, certain epidermal cells are specialized as exocrine glands.
It is not present in honeybees.

The damaging stage of mustard sawfly is Grub and adult.
The grubs cause numerous shot holes and even riddled the entire leaves with voracious feeding. They devour the epidermis of the shoot, resulting in drying up of seedlings and failure to bear seeds in older plants.
Adults inflict damage by act of laying eggs with the help of their saw like ovipositor. Larvae nibble margins of tender leaves and later bite holes in the leaves.

According to International standard grade of silk yarn reeled from CSR hybrids is 2A - 4A.

Yellow mosaic virus disease of moong spreads by Bemisia tabaci.
Mungbean yellow mosaic virus (MYMV) is a plant pathogenic virus of the family Geminiviridae. It is a major exotic disease of mungbeans causing leaf discoloration and yield losses.
Yellow mosaic disease of many legumes is often transmitted by silverfly (Bemisia tabaci). It is characterized by a bright yellow mosaic on the leaves of infected plants and causes significant losses to mungbean.

Commercially granulosis virus (GV) is used for the control of Chilo infuseatellus.
Granuloviruses (GVs) are rod-shaped, double-stranded DNA viruses of the family Baculoviridae which infect a wide range of Lepidoptera and a few Hymenoptera. These viruses cause a highly infectious disease in the larvae of susceptible species.
Granulosis virus is commonly utilized as a carrier for insecticides, in an attempt to reduce potato tuber moth Phthorimaea operculella (Zeller) (PTM) damage at harvest.

"Knock out" is a commercial transgenic hybrid of Soybean.
In plants, such targeted DSBs can be used to knock out genes, modify gene expression by disrupting promoter sequences, or insert transgenes at a specific location via homologous recombination.
The first test of the CRISPR system in soybean was with a GFP (Green Fluorescent Protein)-expressing soybean line, as GFP knock-outs are easily observed by a loss of fluorescence.
The CRISPR/Cas9 system is shown to be effective in soybean by knocking-out a green fluorescent protein (GFP) transgene and modifying nine endogenous loci.

In Cyclorrhapan Diptera accessory pulsating organs are present in Scutellum.
Cyclorrhapha is an unranked taxon within the infraorder Muscomorpha. They are called "Cyclorrhapha" ('circular-seamed flies') concerning the circular aperture through which the adult escapes the puparium.
In addition to the dorsal vessel ("heart"), insects have accessory pulsatile organs ("auxiliary hearts") that supply body appendages with hemolymph. They are indispensable in the open circulatory system for hemolymph exchange in antennae, long mouthparts, legs, wings, and abdominal appendages.

The maxillary stylets in case of Thysanoptera are mostly Lacinia.
Thrips (order Thysanoptera) are minute, slender insects with fringed wings and unique asymmetrical mouthparts.
Thrips have asymmetrical mouthparts unique to the group. Unlike the Hemiptera (true bugs), the right mandible of thrips is reduced and vestigial – and in some species completely absent.
The left mandible is used briefly to cut into the food plant; saliva is injected and the maxillary stylets, which form a tube, are then inserted and the semi-digested food is pumped from ruptured cells.