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There are several species of honeybees which can be reared. Of these the species reared in india is:
Read page 169, XII NCERT
Arrange the following steps of a plant breeding program in a correct chronological manner:
I. Selection and testing of superior recombinants
II. Collection of variability
III. Crosshybridization among the selected parents
IV. Evaluation and selection of parents
V. Testing, release and commercialization of new cultivars
Read page 171, XII NCERT
The best breeding method for animals that are below average in produtivity in milk production would be:
Read page 168, XII NCERT
In mung bean the resistance to yellow mosaic virus and powdery mildew were introduced by:
1. read page 174, XII NCERT
Pusa Shubhra, an improved variety of cauliflower, is resistant to:
Page 174, XII NCERT
To obtain a virus free plant, what can be used as an explant in micropropogation ?
Page 177, XII NCERT
In plants, somatic embryo regeneration is induced usually by a relatively high concentration of:
2,4-D(2,4-Dichlorophenoxyacetic acid) is an organic compound. It is an herbicide that kills plants by changing the way certain cells grow. 2,4-D comes in several chemical forms, including salts, esters, and an acid form.
Auxins mainly 2,4-dichlorophenoxyacetic acid (2,4-D) is required for somatic embryogenesis induction and embryo multiplication to scale-up the number of embryos which can be potentially produced by indirect somatic embryogenesis
Meristem culture is especially important to obtain:
Read page 177, XII NCERT
The crops engineered for glyphosate are resistant/tolerant to
Glyphosate (N-phosphonomethyl glycine) is systemic broad spectrum herbicide used to kill weeds especially broad leaves and grasses. It is used to engineer new crop for having herbicides tolerance (resistant).
Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
Bordeaux mixture was discovered by Millardet in France in 1882. It is prepared by dissolving 40 g of copper sulphate and 40 g of calcium hydroxide in 5 L of water. It was first used to control downy mildew disease of grape-vine that is caused by a fungus Plasmopara viticola. Black rust of wheat is caused by Puccinia graminis tritici. The use of fungicide Dithane
Z-78 and Dithane M-45 control the disease even at lower concentration.
Loose smut of wheat is caused by Ustilago tritici. The use of fungicides (systemic fungicide like D-735 and F-461) give quite encouraging result.
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