Agricultural Entomology - Study Mode

[#346] Example of an exopterygote insect order with a pupal instar in its life cycle
Correct Answer

(A) Thysanoptera

Explanation

Solution: Example of an exopterygote insect order with a pupal instar in its life cycle is Thysanoptera. The Exopterygota is a highly diverse insect superorder, with at least 1,30,000 living species divided between 15 orders. Thrips (order Thysanoptera) are minute (mostly 1 mm (0.039 in) long or less), slender insects with fringed wings and unique asymmetrical mouthparts. They have characteristic tube-shaped apical abdominal segments, egg-laying atop the surface of leaves, and three "pupal" stages.

[#347] Malpighian tubules produce an iso-osmotic filtrate which is
Correct Answer

(A) High in K + and low in Na +

Explanation

Solution: Malpighian tubules produce an iso-osmotic filtrate that is High in K + and low in Na + . Malpighian tubules are slender tubes normally found in the posterior regions of arthropod alimentary canals. Pre-urine is formed in the tubules, when nitrogenous waste and electrolytes are transported through the tubule walls. Uric acid precipitates out, and sodium and potassium ions are actively absorbed by the rectum, along with water via osmosis. Uric acid is left to mix with feces, which are then excreted.

[#348] An insect diet composed of crude organic material is called as
Correct Answer

(C) Oligidic

Explanation

Solution: An insect diet composed of crude organic material is called an Oligidic. Oligidic diets contain crude natural ingredients. Lots of insects eat plants, some insects eat other insects, and some even drink blood. Many insects eat nectar from plants. And some insects will eat whatever scraps of food you leave lying around.

[#349] The integument comprises of
Correct Answer

(A) Cuticle, epidermis and basement

Explanation

Solution: The integument comprises of Cuticle, epidermis and basement. The integument consists of the underlying basement membrane, the living epidermal cell layer, and the overlying, nonliving cuticle that is secreted by the epidermis. It describes the integumentary systems in insects, their chemical composition, and their role in insect physiology.

[#350] Which of the following pairs is not correctly matched in the term of Insect and Damaging stage?
Correct Answer

(A) Potato tuber moth ⇔ Grubs

Explanation

Solution: A. Potato tuber moth ⇔ Grubs. It is not correctly matched. Phthorimaea operculella, also known as the potato tuber moth or tobacco splitworm, is a moth of the family Gelechiidae. It is an oligophagous insect that feeds on the plant family Solanaceae and is especially known for being a major pest of potato crops. B. Rice weevil ⇔ Grubs and adults The rice weevil (Sitophilus oryzae) is a stored product pest that attacks seeds of several crops, including wheat, rice, and maize. The damaging stage of rice weevil is grub and adult. C. Pulse beetles ⇔ Grubs This beetle is a common pest targeting many different species of stored legumes and it is distributed across tropical and subtropical regions. Grubs are the damging stage of pulse beetle. D. Lesser grain borer ⇔ Grubs and adults It is a beetle commonly found within store bought products and pest of stored cereal grains located worldwide. It is also a major pest of peanuts. It feeds on the whole grain in both grub and adult stages.