Agricultural Entomology - Study Mode

[#276] Which insect order is known as 'Euplexoptera'?
Correct Answer

(A) Dermaptera

Explanation

Solution: Dermaptera insect order is known as 'Euplexoptera'. Euplexoptera is the taxonomic order containing earwings which is now known as Dermaptera. Earwigs make up the insect order Dermaptera. With about 2,000 species. In 12 families, they are one of the smaller insect orders. Earwigs have characteristic cerci, a pair of forcep-like pincers on their abdomen, and membranous wings folded underneath short, rarely used forewings, hence the scientific order name, "skin wings".

[#277] Which one of the following is most harmful pest (Insect) for cotton?
Correct Answer

(A) Pink boll worm

Explanation

Solution: Pink boll worm is most harmful pest (Insect) for cotton. Pink bollworm is one of the most destructive pests of cotton in the Punjab, Haryana and Pakistan. The damage is caused by the caterpillars only. They are pink and are found inside flower buds, panicles and the bolls of cotton or the fruits of okra and other allied plants.

[#278] Following is used as a sticker along with insecticide for better spread
Correct Answer

(A) Teepol

Explanation

Solution: Teepol is used as a sticker along with insecticide for better spread. Among the plant derivatives, neem oil 0.5 to 3% and neem seed kernel extract 5% with teepol 0.05% are quite effective against major pest of fruits crops, vegetables. Mix 30 ml of neem oil with 5 ml of sticking agent teepol until white emulsion is formed. Then add one litre of water and mix thoroughly for use of spray fluid.

[#279] Chromosomal pattern for female silk worm is
Correct Answer

(A) ZW

Explanation

Solution: Chromosomal pattern for female silk worms is ZW. In silkworms, the female is the heterogametic sex and has one Z and one W chromosome, whereas the male has two Z chromosomes. In this system the genetic sex of an offspring is determined by a pair of sex chromosomes, always a Z from the father, and either a Z or W from the mother. The ZW system is opposite of the XY system in that the mother's sex chromosome determines the genetic sex of the offspring.

[#280] Which of the following element is not phytotoxic?
Correct Answer

(D) Boron

Explanation

Solution: Boron element is not phytotoxic. Phytotoxins are substances that are poisonous or toxic to the growth of plants. Boron element is not phytotoxic, it plays a key role in a diverse range of plant functions including cell wall formation and stability, maintenance of structural and functional integrity of biological membranes, movement of sugar or energy into growing parts of plants, and pollination and seed set.