54578.Haemozoin is
precursor of haemoglobin
toxin from Streptococcus
toxin from Plasmodium species
toxin from Haemophilus species
Explanation:
Haemozoin is a toxin released by Plasmodium species, which is responsible for the chill and high fever recurring in a malaria patient every three to four days.Streptococcus produces streptomycin and streptococca cyrogenic exotoxin.Haemophilus produces cytolethal distending toxin (HdCDT) which inhibits mammal cell proliferation
Haemozoin is a toxin released by Plasmodium species, which is responsible for the chill and high fever recurring in a malaria patient every three to four days.Streptococcus produces streptomycin and streptococca cyrogenic exotoxin.Haemophilus produces cytolethal distending toxin (HdCDT) which inhibits mammal cell proliferation
54579.One of the following is not the causal organism for ringworm
Microsporum
Trichophyton
Epidermophyton
Macrosporum
Explanation:
Ringworm infections are caused by fungi belonging to the genera Microsporum, trichophyton and Epidermophyton.Macrosporum is an ectomycorrhizal zoosporic fungus causing diseases of economically important vascular plants.
Ringworm infections are caused by fungi belonging to the genera Microsporum, trichophyton and Epidermophyton.Macrosporum is an ectomycorrhizal zoosporic fungus causing diseases of economically important vascular plants.
54580.A person with sickle-cell anaemia is
more prone to malaria
more prone to typhoid
less prone to malaria
less prone to typhoid
Explanation:
Sickle-cell anaemia is related to malaria not to typhoid and person suffering from sickle-cell anaemia are resistant to malarial parasite as RBC of sickle-cell anaemic patients is distored in shape that is not affected by Plasmodium
Sickle-cell anaemia is related to malaria not to typhoid and person suffering from sickle-cell anaemia are resistant to malarial parasite as RBC of sickle-cell anaemic patients is distored in shape that is not affected by Plasmodium
54581.The chances of contacting bird flu from a properly cooked (above 100° C) chicken
and egg are
very high
high
moderate
None of these
Explanation:
Proper cooking at or above 70°C, prior to eating, will inactivate the virus in the egg as well as in the meat
Proper cooking at or above 70°C, prior to eating, will inactivate the virus in the egg as well as in the meat
54582.A group of animals which are related by descent and sharemany similarities are referred to as
breed
race
variety
species
Explanation:
A group of animals that are related by descent and are similar in most characters like general appearance, features, size, configuration, etc., are said to belong to a breed.Race is a classification system used to categorize humans into large and distinct populations or groups based on anatomical, cultural, ethnic or geographical differences.Variety is a genetically and morphologically distinct subset of a species that is geographically isolated from other populations within that species.A species is defined as a group of individuals that potentially interbreed in nature.
A group of animals that are related by descent and are similar in most characters like general appearance, features, size, configuration, etc., are said to belong to a breed.Race is a classification system used to categorize humans into large and distinct populations or groups based on anatomical, cultural, ethnic or geographical differences.Variety is a genetically and morphologically distinct subset of a species that is geographically isolated from other populations within that species.A species is defined as a group of individuals that potentially interbreed in nature.
54583.Inbreeding is carried out in
animal husbandry because it
increases vigour
improves the breed
increases
heterozygosity
increases homozygosity
Explanation:
Inbreeding increases homozygosity, i.e., state of possessing two identical alleles, one inherited from each parent. It is necessary if we want to evolve a pureline in any animal.Inbreeding exposes harmful recessive genes that are eliminated by selection. It also helps in accumulation of superior genes and elimination of less desirable genes.
Inbreeding increases homozygosity, i.e., state of possessing two identical alleles, one inherited from each parent. It is necessary if we want to evolve a pureline in any animal.Inbreeding exposes harmful recessive genes that are eliminated by selection. It also helps in accumulation of superior genes and elimination of less desirable genes.
54584.Sonalika and Kalyan Sona are
varieties of
wheat
rice
millet
tobacco
Explanation:
Sonalika and Kalyan Sona are outstanding semi-dwarf varieties of wheat possessing amber grains and good yield potential. They were developed in 1963 at Indian Agriculture Research Institute, as a part of systematic programme for breeding semi-dwarf wheat varieties.
Sonalika and Kalyan Sona are outstanding semi-dwarf varieties of wheat possessing amber grains and good yield potential. They were developed in 1963 at Indian Agriculture Research Institute, as a part of systematic programme for breeding semi-dwarf wheat varieties.
54585.Which
one of the following is not a fungal disease?
Rust of wheat
Smut of bajra
Black rot of
crucifers
Red rot of sugarcane
Explanation:
Black rot of crucifers is not a fungal disease. It is caused by a bacteria, Xanthomonas campestris. Other three diseases are caused by fungal infection. Rust-of wheat is caused by a fungus, Puccinia, red rot of sugarcane is caused by Colletotrlchum falcatum and smut of bajra is caused by Tolypospohum penicillariae.
Black rot of crucifers is not a fungal disease. It is caused by a bacteria, Xanthomonas campestris. Other three diseases are caused by fungal infection. Rust-of wheat is caused by a fungus, Puccinia, red rot of sugarcane is caused by Colletotrlchum falcatum and smut of bajra is caused by Tolypospohum penicillariae.
54586.In virus-infectedplants the meristematic tissues in
bothapical and axillary buds are free of virus because
the dividing cells are virus resistant
meristems have antiviral compounds
the cell division of meristemsare faster than the rate
of viral multiplication
viruses cannot multiply within meristem cell(s)
Explanation:
the cell division of meristems are faster than the rate of viral multiplicationIn virus infected plants the meristematic tissues in both apical and axillary buds are free of virus because the multiplication of meristematic cells is faster than replication of a viruses.The main reason behind it is the gene silencing. Neither dividing cells are virus resistantnor the meristems have antiviral compounds.
the cell division of meristems are faster than the rate of viral multiplicationIn virus infected plants the meristematic tissues in both apical and axillary buds are free of virus because the multiplication of meristematic cells is faster than replication of a viruses.The main reason behind it is the gene silencing. Neither dividing cells are virus resistantnor the meristems have antiviral compounds.
54587.Several South Indian states raise 2-3 crops of rice annually. The agronomicfeature that makes this possible is because of
shorter rice plant
better irrigation facilities
early yielding rice variety
disease resistant ricevariety
Explanation:
Several South Indian states raise 2-3 crops of rice annuallyby using the early yielding rice variety. These varieties are a groupof crops created intentionally during the green revolution to increase global food production.
Several South Indian states raise 2-3 crops of rice annuallyby using the early yielding rice variety. These varieties are a groupof crops created intentionally during the green revolution to increase global food production.
54588.Which one of the following combination would a sugarcane farmer look for in the sugarcane crop?
Thick stem, long internodes, high sugar content and disease resistant
Thick stem, high sugar content and profuse flowering
Thick stem, short internodes, high sugar content, disease resistant
Thick stem, low sugar content and disease resistant
Explanation:
In the sugarcane crop, a sugarcane farmer looks for thick stem, long internodes, high sugar content and disease resistance.
In the sugarcane crop, a sugarcane farmer looks for thick stem, long internodes, high sugar content and disease resistance.
54589.Fungicides and antibiotics are chemicals that
enhance yield and disease resistance
kill pathogenic fungi and bacteria, respectively
kill all pathogenic microbes
kill pathogenic bacteria and fungi respectively
Explanation:
A wide range of fungal, bacterial and viral pathogens, affect the yield of cultivated crop species. Fungicides and antibiotics are chemicals that kill pathogenic fungi and bacteria, respectively.
A wide range of fungal, bacterial and viral pathogens, affect the yield of cultivated crop species. Fungicides and antibiotics are chemicals that kill pathogenic fungi and bacteria, respectively.
54590.Use of certain chemicals and radiation to change the base sequences of genes of crop plants is termed
recombinant DNA technology
transgenic mechanism
mutation breeding
gene therapy
Explanation:
It is possible to induce mutations artificially in crop plants through the use of chemicals or radiations (like gamma radiations), and then selecting and using those plants that have the desirable character as a source in breeding. This process is called mutation breeding.Use of radiations is not involved in other three options. Recombinant DNA technology involves transferring of a desired gene (trans gene) from an organism and incorporating it to host organism by genetic engineering to produce a recombinant to gene therapy is performed mainly in humans. It involves replacing a defective gene with a normal one.
It is possible to induce mutations artificially in crop plants through the use of chemicals or radiations (like gamma radiations), and then selecting and using those plants that have the desirable character as a source in breeding. This process is called mutation breeding.Use of radiations is not involved in other three options. Recombinant DNA technology involves transferring of a desired gene (trans gene) from an organism and incorporating it to host organism by genetic engineering to produce a recombinant to gene therapy is performed mainly in humans. It involves replacing a defective gene with a normal one.
54591.The scientific process by which crop plants are enriched with certain desirable nutrients is called
crop protection
breeding
biofortification
bioremediation
Explanation:
Biofortification is breeding crops with higher levels of vitamins and minerals, or higher protein and healthier fats. It is the most practical means to improve public health.The other options are incorrect because crop protection includes many ways for protecting crops against a number of pests and pathogens.Breeding involves artificial mating of two plants with desirable characteristics to produce a progeny with features of both the parents. Bioremediation is a waste management technique that involves the used of organisms to remove or neutralise pollutants from a contaminated site.
Biofortification is breeding crops with higher levels of vitamins and minerals, or higher protein and healthier fats. It is the most practical means to improve public health.The other options are incorrect because crop protection includes many ways for protecting crops against a number of pests and pathogens.Breeding involves artificial mating of two plants with desirable characteristics to produce a progeny with features of both the parents. Bioremediation is a waste management technique that involves the used of organisms to remove or neutralise pollutants from a contaminated site.
54592.The term 'Totipotency' refers to the capacity of a
cell to generate whole plant
bud to generate whole plant
seed to germinate
cell to enlarge in size
Explanation:
cell to generate whole plantThe capacity of a cell or an expiant (any part of plant taken out and grown in test tube) togrow into a wholeplant is called 'totipotency'.
cell to generate whole plantThe capacity of a cell or an expiant (any part of plant taken out and grown in test tube) togrow into a wholeplant is called 'totipotency'.
54593.Given below are a few statementsregardingsomatic hybridisation. Choose the correct statements. I. Protoplasts of different cells of the same plant are fused . II. Protoplasts from cells of different species can be fused. III. Treatment of cells with cellulase and pectinase is mandatory. IV. Thehybridprotoplastcontainscharactersof onlyoneparentalprotoplast.
I and II
I and II
I and IV
IV and III
Explanation:
The process of producing somatic hybrids involves the following steps:I.Single cells from selected plants are isolated.II.The cell walls of cells are digested by enzymes like pectinase and cellulase to expose the naked protoplasts.III.Naked protoplasts surrounded only by plasma membranes are isolated.IVThe isolated protoplasts are fused to obtain hybrid protoplasts under sterile conditions in special nutrient media.VThe hybrid protoplasts are cultured in a suitable media to form new plant. The hybrid protoplast contains characters of both parental protoplasts.
The process of producing somatic hybrids involves the following steps:I.Single cells from selected plants are isolated.II.The cell walls of cells are digested by enzymes like pectinase and cellulase to expose the naked protoplasts.III.Naked protoplasts surrounded only by plasma membranes are isolated.IVThe isolated protoplasts are fused to obtain hybrid protoplasts under sterile conditions in special nutrient media.VThe hybrid protoplasts are cultured in a suitable media to form new plant. The hybrid protoplast contains characters of both parental protoplasts.
54594.An explant is
death plant
Part of the plant
part of the plant used in tissue culture
Partof the plant that expresses a specific gene
Explanation:
Any part of a plant taken out and grown in a test tube under sterile conditions in a special nutrient media is called an explant. A whole plant can be generated from an explant.
Any part of a plant taken out and grown in a test tube under sterile conditions in a special nutrient media is called an explant. A whole plant can be generated from an explant.
54595.The biggest constraint of plant breeding is
Availability of desirable gene in the crop and its wild relatives
Infrastructure
trained manpower
transfer of genes fromunrelated sources
Explanation:
Breeding (conventional) is often constrained by the availability of limited number of disease resistantgenes that are present and identified in various crop varieties or wild relatives.
Breeding (conventional) is often constrained by the availability of limited number of disease resistantgenes that are present and identified in various crop varieties or wild relatives.
54596.Lysine and tryptophan are
Protiens
non-essential amino acids
essential aminoacids
aromatic amino acids
Explanation:
Lysine and tryptophan are essential amino acids
Lysine and tryptophan are essential amino acids
54597.Micro-propagation is
propagation ofmicrobes in vitro
propagation ofplants in vitro
propagation of cells in vitro
growing plants on smaller scale
Explanation:
Micro-propagation is propagation of plants in vitro to achievea large number of plantsin very shorts durations. This results in genetically identical plants and is widely used in forestry and floriculture
Micro-propagation is propagation of plants in vitro to achievea large number of plantsin very shorts durations. This results in genetically identical plants and is widely used in forestry and floriculture