Genetics And Plant Breeding - Study Mode

[#811] For Disease resistance purpose which of the following breeding method is conducted?
Correct Answer

(D) Both B and C

Explanation

Solution: For disease resistance purposes, Backcross breeding and Transgenic breeding both breeding methods is conducted. Backcross breeding enables breeders to transfer a desired trait such as a transgene from one variety (donor parent, DP) into the favored genetic background of another (recurrent parent, RP). Genetic improvement of crop plants, domestic animals and useful micro-organisms, through genetic engineering, about their economic use for mankind is referred to as transgenic breeding.

[#812] Mechanisms of insect resistance were given by
Correct Answer

(C) Painter (1951)

Explanation

Solution: Mechanisms of insect resistance were given by Painter (1951). When a pesticide is first used, a small proportion of the pest population may survive exposure to the material due to their distinct genetic makeup. Based on some of his previous work, Painter in his classical book “Insect Resistance in Crop Plants” (1951) proposed insect resistance in plants.

[#813] First hybrid in pulses (Arhar) in India, developed through genetic male sterility
Correct Answer

(B) ICPH-8

Explanation

Solution: The first hybrid in pulses (Arhar) in India, developed through genetic male sterility is ICPH-8. ICPH-8, the world's first pigeon pea hybrid, was developed by scientists at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) in Patancheru, near Hyderabad. The ICPH 8 plants are vigorous, semi spreading, and indeterminate in growth habit with profuse branching, flowering, and podding characteristics. Plant height varies between 125 and 173 cm with an average of 140 cm (Table 1). It flowers 80 - 85 days after sowing and reaches 75% maturity in 115 - 135 days.

[#814] The ovary of family liliaceae is
Correct Answer

(A) Trilocular superior with axil placentation

Explanation

Solution: The ovary of the family Liliaceae is Trilocular superior with axil placentation. The lily family, Liliaceae, consists of about 15 genera and 610 species of flowering plants within the order Liliales. They are monocotyledonous, perennial, herbaceous, and often bulbous geophytes. It has a characteristic flower with parts arranged in threes, with six coloured or patterned petaloid tepals arranged in two whorls, six stamens and a superior ovary. Superior ovary (hypogynous), syncarpous (with fused carpels), with three connate (fused) carpels and trilocular (three locules, or chambers). There is a single style and a three-lobed stigma or three stigmata more or less elongated along the style. Numerous anatropous ovules display axile placentation, usually with an integument and thinner megasporangium.

[#815] Which one is the smallest RNA?
Correct Answer

(B) tRNA

Explanation

Solution: tRNA is the smallest RNA among the 3 types of RNA, possessing around 75 - 95 nucleotides. tRNAs are an essential component of translation, where their main function is the transfer of amino acids during protein synthesis. Therefore, they are called transfer RNAs. Transfer RNA (tRNA) has a long-established role in protein synthesis. The tRNA molecule serves as an adaptor between the genetic instructions written in nucleic acid sequences and the protein products encoded in genes.