Agricultural Entomology - Study Mode

[#476] Which is the first protective insecticide?
Correct Answer

(B) DDT

Explanation

Solution: The first protective insecticide is DDT. Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless, tasteless, and almost odorless crystalline chemical compound, an organochloride. DDT was first synthesized in 1874 by the Austrian chemist Othmar Zeidler. DDT's insecticidal action was discovered by the Swiss chemist Paul Hermann Müller in 1939.

[#477] Project Directorate of Biological Control is located at
Correct Answer

(A) Bangalore

Explanation

Solution: Project Directorate of Biological Control is located in Bangalore. PDBC was the nodal agency in the country that organizes biological control research at the national level with 16 centres spread across the country. It acts as a nodal agency for collection, characterization, documentation, conservation, exchange, research and utilization of agriculturally important insect resources (including mites, spiders and related arthropods) and insect-derived resources for sustainable agriculture.

[#478] Outstretched ovaries are found in
Correct Answer

(D) All of these

Explanation

Solution: Outstretched ovaries are found in Radopholus, Hirschmanniella and Tylenchorhynchus. Ovary in most of the plant parasitic nematodes is always straight and does not curve back. Such ovaries are called outstretched ovaries as in the case of Tylenchorhynchus, Radopholus and Hirschmanniella etc.

[#479] Honey which is used in ayurvedic medicine
Correct Answer

(A) Triigona (melipona) iridipennis

Explanation

Solution: Honey that is used in ayurvedic medicine is Triigona (melipona) iridipennis. The Indian stingless bee or dammar bee, Tetragonula iridipennis, is a species of bee belonging to the family Apidae, subfamily Apinae. T. iridipennis stores its honey in pots that are within a food storage zone of the nest. The food storage zone contains a honey storage pot and a pollen storage pot, but these are often intermixed. The honey of T. iridipennis is a rich source of antioxidant flavanoids. This is because workers collect honey from medicinally important herbal plants and flowers. The quantity of honey produced is a relatively small 600 - 700 grams per year.

[#480] Eriophyid mite (Aceria cajani) belongs to family
Correct Answer

(C) Eriophyidae

Explanation

Solution: Eriophyid mite (Aceria cajani) belongs to family Eriophyidae. Aceria is a genus of mites belonging to the family Eriophyidae, the gall mites. These tiny animals are parasites of plants. Several species can cause blistering and galls, including erineum galls. A few are economically significant pests, while others are useful as agents of biological pest control of invasive plants such as rush skeletonweed (Chondrilla juncea), creeping thistle (Cirsium arvense), and field bindweed (Convolvulus arvensis).