Agricultural Entomology - Study Mode

[#431] In nematode, tylenchids stylet develop from
Correct Answer

(B) Buccal wall

Explanation

Solution: 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.

[#432] Which of the following root knot nematode species perennial pattern in nature and distinctly marked by the presence of lateral ridges?
Correct Answer

(A) Meloidogyne incognita

Explanation

Solution: 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.

[#433] Cement layer is absent in which insect?
Correct Answer

(B) Honeybees

Explanation

Solution: 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.

[#434] The damaging stage of mustard saw fly
Correct Answer

(C) Grub and adult

Explanation

Solution: 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.

[#435] According to International standard grade of silk yarn reeled from CSR hybrids is
Correct Answer

(A) 2A - 4A

Explanation

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