Most Reapted Agriculture Questions and Answers

Correct Answer: Alfalfa
Alfalfa (Medicago sativa) is a naturally cross-pollinated legume that experiences significant loss of vigor and productivity (inbreeding depression) when inbred (self-pollinated). Sorghum and pearl millet are often cross-pollinated but show less depression, while sunflower shows moderate depression.

Correct Answer: Tetrazolium chloride
The tetrazolium test uses 2,3,5-triphenyl tetrazolium chloride (TTC). Living, respiring tissues in the seed embryo reduce the colorless TTC to a red-colored insoluble compound called formazan, visually indicating viability. Non-viable tissues remain unstained.

Correct Answer: White
Foundation Seed, which is the progeny of Breeder Seed, is required to have a White color certification tag according to the standards set under the Indian Seeds Act.

Correct Answer: Single cross (A x B)
A single cross hybrid, produced by crossing two distinct homozygous inbred lines, usually exhibits the highest level of heterosis because it maximizes the heterozygosity and combination of favorable dominant genes in the F1 generation.

Correct Answer: Onion
Although hybrid vigor was recognized early in maize, the first large-scale commercial production of hybrid seeds using a practical Cytoplasmic Male Sterility (CMS) system was achieved in onions by Henry Jones in the 1940s.

Correct Answer: *Brassica campestris* x *Brassica nigra*
*Brassica juncea* (AABB genome) is an allotetraploid that originated from an interspecific cross between *Brassica rapa* (syn. *B. campestris*, AA genome) and *Brassica nigra* (BB genome), followed by chromosome doubling. This relationship is depicted in the 'Triangle of U'.

Correct Answer: Johannsen
Wilhelm Johannsen, a Danish botanist, proposed the pure-line theory around 1903 based on his work with self-pollinating beans. He demonstrated that variation within a pure line (homozygous individuals) is environmental, and selection within it does not alter its genetic makeup.

Correct Answer: Bajra (Pearl Millet)
These designations (MPMH - Mandor Pearl Millet Hybrid, RHB - Rajasthan Hybrid Bajra) represent high-yielding hybrid varieties of Bajra (Pearl Millet - *Pennisetum glaucum*), commonly grown in India, particularly in arid and semi-arid zones like Rajasthan.

Correct Answer: Tt x tt
A 1:1 phenotypic ratio (Tall:Dwarf) is characteristic of a test cross involving a heterozygous parent (Tt) and a homozygous recessive parent (tt). The Tt parent produces T and t gametes; the tt parent produces only t gametes, resulting in Tt (Tall) and tt (Dwarf) offspring in equal proportions.

Correct Answer: Laterite soils
Zonal soils were defined as mature soils reflecting the primary influence of climate and vegetation. Laterite soils, formed under intense weathering in humid tropical/subtropical climates, were classified as Zonal. Alluvial soils (Azonal) are young and dominated by parent material, while Saline soils (Intrazonal) are influenced by local factors.