Recent questions in Biology

Most active nitrogen-fixing blue green alga of rice fields is

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Rotenone is

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Antifeedant property occurs in

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Thurioside is

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The substance used in the tissue culture medium for induction of shoots in callus is

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'Norin gene' of dwarfness in wheat originated through spontaneous mutation in

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A major application of embryo culture is

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Removal of stamens in an inter-sexual flower before they dehisce is called

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Which of the following is the aspects of crop improvements?

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Which one of the following yields edible oils?

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Which one of the following yields jute ?

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Protoplasts from different varieties or spices can be fused with the help of

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The first report of successful production of haploid plants from anther culture was made from

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Many of the sugarcane varieties cultivated today are

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A plant which is cultivated by tissue culture technique is

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Mutations can be induced by

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Selection of homozygous plant is

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Modern,bread wheat Triticum aestivum is

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In tissue culture medium,the embryoids formed from pollen grains is due to

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Haploid plantlets can be produced by

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:'Embryo rescue' is culturing of young embryo,fertilised ovule or pollinated ovary.}\\\text{Reason:'Embryo rescue' is performed to protect the development of embryo.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Our present day crop plants are entirely different from their wild ancestors.}\\\text{Reason:Almost all our present day crops are the result of selections carried out by the prehistoric human beings.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:To obtain maximum advantage of heterosis,hybrid seeds must be produced every year.}\\\text{Reason:Heterosis is lost by inbreeding.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Somatic tissues formed embryoids by tissue culture technique.}\\\text{Reason:Embryoids look like normal seed embryos.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Somaclonal variations occur in tissue culture processes.}\\\text{Reason:Variations cannot occur in nature.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Virus-free plants can be produced from virus infected plants by means of meristems tissue culture .}\\\text{Reason:The virus fails to grow during the growth of host tissue in the artificial medium.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Protoplast fusion is one of the major advantages of tissue culture.}\\\text{Reason:The naked protoplasts of two different plants fuse of form a hybrid.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Cloning is also known as 'Micropropagation'.}\\\text{Reason:This technique is helpful in propagating many valuable and commercially useful plants.}\end{array}$

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Removal of stamens in an inter-sexual flower before they dehisce is called

asked Jul 15, 2014 by sreemathi.v

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Which of the following is/are the aspects of crop improvements?

asked Jul 15, 2014 by sreemathi.v

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Which one of the following yields edible oils?

asked Jul 15, 2014 by sreemathi.v

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Which one of the following yields jute?

asked Jul 15, 2014 by sreemathi.v

1 answer

Protoplasts from different varieties or species can be fused with the help of

asked Jul 15, 2014 by sreemathi.v

1 answer

The first report of successful production of haploid plants from anther culture was made from

asked Jul 15, 2014 by sreemathi.v

1 answer

Many of the sugarcane varieties cultivated today are

asked Jul 15, 2014 by sreemathi.v

1 answer

Mutations can be induced by

asked Jul 15, 2014 by sreemathi.v

1 answer

Modern,bread wheat Triticum aestivum is

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Typhoid carriers may be cured by surgical removal of their spleen.}\\\text{Reason:The typhoid causing bacteria remain concentrated in the spleen of the carriers.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Dengue fever is an acute tropical frequently epidermic viral disease of humans.}\\\text{Reason:It is spread by the bites of the mosquitoes generally Aedes aegypti,but also albopictus.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Rabies is a 100% fatal infectious disease of mammals.It destroys brain and spinal cord cells.}\\\text{Reason:It is caused by bacteria that enter human body with saliva of the infected (rabid) dog.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:It is advantageous to give the polio vaccine orally.}\\\text{Reason:It checks reinfection by providing intestinal immunity.Pathogen enter the body via digestive tract.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The defect called erythroblastocis foetatis results if Rh-negative mother carries a second Rh-positive.}\\\text{Reason:Replacement of the infant's blood immediately after child-birth often cures the defect.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:There is no chance of transmission of malaria on the bite by a male Anopheles mosquito.}\\\text{Reason:Male Anopheles carries a non-virulent strain of Plasmodium.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Haemophilia shows criss-cross inheritance.}\\\text{Reason:The gene that cause haemophilia is recessive and lies in the *** X chromosome .}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Smoking increases blood pressure.}\\\text{Reason:Nicotine causes tension that constricts the arteries,raising the blood pressure.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:A cholera patient is given glucose,electrolytes and water.}\\\text{Reason:These materials plasmolyse the pathogenic bacteria.}\end{array}$

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Leprosy in an infectious disease.However,the babies separated from the leper parents early in life grow into normal,healthy persons.}\\\text{Reason:Infection of leprosy occurs by prolonged and close contact with leprosy patients.}\end{array}$

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A colourblind person cannot distinguish

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Queen victoria of England was

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Erythroblastosis foetalis occurs when

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