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Answers posted by pady_1

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Why do high areas have brighter sunlight and lower temperatures as compared to the plains?
answered Jul 10, 2017
Due to thinner atmosphere and absence of dust particle.a. Brighter sunlight : There is little diffra...
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Which element is responsible for causing soil salinity? At what concentration does the soil become s
answered Jul 10, 2017
Sodium is responsible for causing salinity. At a concentration of 500ppm, soil becomes saline.
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What is a tree line?
answered Jul 10, 2017
It is the altitude beyond which no tree grows. Only herbs and shrubs are seen in tree line area.
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Give the scientific name of any two microorganisms inhibiting the human intestine.
answered Jul 10, 2017
Escherichia coli and Streptococcus faecalis.
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In an association of two animal species, one is a termite which feeds on wood and the other is a pro
answered Jul 10, 2017
Mutualism
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Give a suitable example for commensalism. 
answered Jul 10, 2017
Cattle egret and grazing cattle
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Define aestivation. 
answered Jul 10, 2017
Aestivation is summer sleep undertaken by the organisms to overcome the heat. 
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What are the organisms that feed on plants sap and other plant parts called?
answered Jul 10, 2017
Phytophagus
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What would be the growth rate pattern, when the resources are unlimited? 
answered Jul 10, 2017
When the resources are unlimited exponential growth pattern would be observed. 
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Emergent land plants that can tolerate the salinities of the sea are called?
answered Jul 10, 2017
Emergent land plants that can tolerate the salinities of the sea are called Mangrove plants.
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What is Mycorrhiza? 
answered Jul 10, 2017
Mycorrhiza is a symbiotic association or mutualistic association between a fungus and the roots of t...
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Name the association in which one species produces poisonous substance or a change in environmental
answered Jul 10, 2017
Ammensalism produces poisonous substance or a change in environmental condition that is harmful to a...
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"The probability that a student will pass in economics is 2/3 and that he w
answered Jul 10, 2017
Let $A$ be the event of passing in economics, and B be the event of passing in english. $P(A \cup B...
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a furniture dealer deals only in two items table and chair . He has rs. 250
answered Jul 10, 2017
Let $x$ be number of tables and $y$ be number of chairs. So $ 650x + 250y <= 25000 $ $ 13x + 5...
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What is commensalism? 
answered Jul 10, 2017
An interaction between two individuals of two different species in which one is benefited while othe...
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What is the interaction between two species called? 
answered Jul 10, 2017
The interaction between two species is called Symbiosis. 
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Define stenohaline species.
answered Jul 10, 2017
Species that can tolerate a narrow range of salinity are called stenohaline species. 
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Species that can tolerate wide range of salinity are called?
answered Jul 10, 2017
Species that can tolerate wide range of salinity are called Euryhaline. 
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What are eurythermic species? 
answered Jul 10, 2017
Species that can tolerate wide range of temperature.Example : Cyclops.
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Species that can tolerate narrow range of temperature are called ?
answered Jul 10, 2017
Species that can tolerate narrow range of temperature are called stenothermal species. 
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While creating genetically modified organisms, genetic barriers are not respected. How can this be d
answered Jul 10, 2017
a. Generic pollution : Transgenes can be transferred from one plant to another, to microbes and...
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answered Jul 10, 2017
a. Restriction Endonucleases : They are used for cutting DNAs at specific places.b. Gel Electro...
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What is meant by the term biopesticide? Name and explain the mode of action of popular biopesticide.
answered Jul 10, 2017
Biopesticide is a living organism, its product or gene that is able to kill or repel the pest. It do...
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List the disadvantages of insulin obtained from the pancreas of slaughtered cows and pigs.
answered Jul 10, 2017
a. Insulin obtained from slaughtered cattle and pigs is slightly different from human insulin. ...
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Explain with the help of one example how genetically modified plants can (a) Reduce usage of chemica
answered Jul 10, 2017
a. Reduced usage of chemical pesticides: This is possiblethrough developing pest resistant plants. R...
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What are the various advantages of using genetically modified plants to increase the yield of the cr
answered Jul 10, 2017
Advantages of using genetically modified plants are:a. Higher yield: Crop plants can be made to grow...
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Highlight five areas where biotechnology has influenced our lives.

 answered Jul 10, 2017
a. Availability of biochemicalb. Gene therapyc. Molecular diagnosisd. Biofortification of crop plant...
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Define transgenic animals. Explain in detail any four areas where they can be utilized?
answered Jul 10, 2017
Transgenic animals are the animals that are genetically modified by incorporating foreign and other ...
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A patient is suffering from ADA deficiency, can he be cured? How?
answered Jul 10, 2017
Yes, the person can be cured with the help of gene therapy. ADA gene is taken from the leucocytes&nb...
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Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also
answered Jul 10, 2017
Bt. Cotton contains genes against lepidopterans, dipterans and coleopterans. However, these genes ar...
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When a foreign DNA is introduced into an organism, how is it maintained in the host and how is it tr
answered Jul 10, 2017
Foreign DNA is generally ligated to a plasmid and introduced into the host. As the plasmid repl...
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Gene therapy is an attempt to correct genetic defect by providing the normal gene into the indi
answered Jul 10, 2017
Gene therapy is a better option as it is a permanent cure. Enzyme therapy can be successful onl...
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Define antigen and antibody. Name any two diagnostic kits based on them.
answered Jul 10, 2017
Antigen : It is any foreign substance , toxin, particle or pathogen which induces the immu...
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Taking examples, under each category, discuss upstreaming and downstream processing.
answered Jul 10, 2017
Upstream processing : It is the start  of microbial activity for an industrial process. Up...
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Why is it that the line of treatment for a genetic disease is different from infectious disease.?
answered Jul 10, 2017
Genetic disease is due to improper functioning of some genes, which results in non functioning&...
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What is recombinant DNA vaccine? Give two examples.
answered Jul 10, 2017
Recombinant DNA vaccine is the one that has been formed with the help of recombinant DNA and contain...
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Gene expression can be controlled with the help of RNA. Explain the method with an example.
answered Jul 10, 2017
The technology is called RNA interference. RNA interference is the phenomenon of inhibiting the acti...
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Discuss the advantages of GMO.
answered Jul 10, 2017
GMOs are genetically modified organisms. They include plants, microbes and animals.GM PLANTS:a. Tole...
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For which variety of Indian rice, the patent was filed by a USA company?
answered Jul 10, 2017
For Indian Basmati rice. 
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With respect to understanding diseases, discuss the importance of transgenic animal models.
answered Jul 10, 2017
Transgenic animals are being used as models to study how genes take part in development of dise...
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How was insulin obtained before the advent of rDNA technology? What were the problems encountered?
answered Jul 10, 2017
Before the advent of rDNA-technology, insulin was obtained from slaughtered cattle and pigs.Problems...
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How is mature, functional insulin hormone different from prohormone form?
answered Jul 10, 2017
Prohormone of insulin contains extra 35 aminoacids on C-peptide. During maturation of insulin f...
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ELISA technique is based on the principles of antigen-antibody interaction. Can this technique be us
answered Jul 10, 2017
Yes, the technique can be used against the enzyme phenylalanine hydroxylase by developing an antibod...
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PCR is a useful tool for early diagnosis of an infectious disease. How.
answered Jul 10, 2017
PCR is useful for amplification or increase in number of DNA  molecules. The technique is ...
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Give the full form of ELISA. Which disease can be detected using it?
Discuss the principle under
answered Jul 10, 2017
ELISA stands for Enzyme Linked Immuno Sorbent Assay. AIDS, Hepatitis, Thyroid disorder and Rubella v...
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In view of the current food crisis, it is said that we need another green revolution. Highlight the
answered Jul 10, 2017
Limitations of Green Revolution:a. Poor farmers could not afford HYV seeds, fertilizers and mac...
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Name the first transgenic cow. Which gene was introduced in this cow?
answered Jul 10, 2017
First Transgenic Cow: Rosie which gave milk with high protein content. Introduced gene was Huma...
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Can a disease be detected before its symptoms appear? Mention the principle involved.
answered Jul 10, 2017
Yes. Very small concentrations of bacteria or virus can be detected by amplification of nucleic...
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Expand GMO.
answered Jul 10, 2017
GMO is Genetically Modified Organism.
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What would happen when one grows a recombinant bacterium in a bioreactor but forgot to add antibioti
answered Jul 10, 2017
Antibiotic does not allow other bacterium to grow in the medium. In the absence of the antibiot...
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