- Which of the following crops show a very high degree of inbreeding depression?
(a) Sorghum
(b) Alfa-alfa
(c) Pearl millet
(d) Sunflower - Which of the following chemical is used for testing seed viability?
(a) Tetrazolium chloride
(b) Ether
(c) Thiourea
(d) Benzene - The color of the tag used to label the foundation seed bag is?
(a) White
(b) Green
(c) Blue
(d) Golden yellow - Maximum heterosis is manifested by?
(a) Single cross
(b) Double cross
(c) Three-way cross
(d) Top cross - Hybrid varieties were first developed in the following crop :
(a) Sorghum
(b) Maize
(c) Onion
(d) Castor - The amphidiploid Brassica Juncea has been evolved through hybridization between?
(a) Brassica campestris x Brassica napus
(b) Brassica campestris x Brassica nigra
(c) Brassica carinata x Brassica nigra
(d) Brassica nigra x Brassica olerace - The pure-line theory was proposed by-
(a) John
(b) Mendel
(c) Johannsen
(d) Swaminathan - MPMH17, RHB223, MPMH21, and RHB224 are the recommended hybrids of?
(a) Maize
(b) Sorghum
(c) Cotton
(d) Bajra - A tall plant is crossed with a dwarf plant. In the progeny, about one-half of the plants are tall and the remaining one half are dwarf. Determine the genotypes of the tall and dwarf plants.
(a) TT x tt
(b) Tt x Tt
(c) Tt x tt
(d) tt x tt - Which one great soil group of the following belongs to order zonal soils?
(a) Laterite soils
(b) Alluvial soils
(c) Saline soils.
(d) Regosols
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