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Recent questions tagged class 12
Questions
Which metabolic process causes a reduction in the Gross Primary Productivity?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
If we count the number of insects on a tree and number of small birds depending on those insects as also the number of larger bird eating the smaller, what kind of pyramid of number would we get?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Decomposition is faster if deteritus is rich in nitrogen and water soluble substance like sugars. When is decomposition slower?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Write the equation that helps in deriving the net primary productivity of an Ecosystem
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Sedimentary cycle is quite different from a gaseous cycle with respect to its reservoir. Bring out the difference.
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
In burnt out Forests and flooded lands succession takes place faster. Why?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
As succession proceeds the numbers and types of animals and decomposers also change. How?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
The detritus food chain and grazing food chain differ. How?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Can temperature regulate the rate of decomposition how?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Detritus contribute to the biogeochemical cycles, how?
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
All the primary productivity is not available to the herbivore,give one reason.
cbsc
class 12
biology
ecosystem
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Explain how recombinants and non- recombinants are differentiated on the basis of colour production in the presence of a chremogenic substrate. Name that procedure. Describe the temperature treatment (-3 step-) that enhances the bacteria to take up the rDNA.
cbsc
class 12
biology
biotechnology : principles and process
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What do you mean by PCR? Briefly enumerate the major steps of PCR. Mention the utility of PCR.
cbsc
class 12
biology
biotechnology : principles and process
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Draw a neat, labeled diagram of <br> (a) simple stirred tank bioreactor <br> (b) sparged tank bioreactor.
cbsc
class 12
biology
biotechnology : principles and process
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
0
answers
Enumerate the major steps for isolation of DNA.
cbsc
class 12
biology
biotechnology : principles and process
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Highlight the salient features that are required to facilitate cloning into a vector.
cbsc
class 12
biology
biotechnology : principles and process
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention the steps involved in the separation and isolation of DNA fragments through agarose gel electrophoresis. <br> Or<br> Describe in brief the principle of DNA isolation through gel electrophoresis.
cbsc
class 12
biology
biotechnology : principles and process
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Enlist the major steps in recombinant DNA technology.
cbsc
class 12
biology
biotechnology : principles and process
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
How can you make a bacterial cell competent to take up foreign DNA ?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is insertional inactivation?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention the role of selectable marker in cloning vector with an example.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are “sticky end” and “blind ends” ?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is a palindromic sequence? Give example.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention one basic difference between restriction endonucleases and exonucleases.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why do bacteria possesses restriction enzyme ?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention the three steps involve in genetically modifying an organism.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is gene cloning?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Enlist the core techniques that pave the way for modern biotechnology.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are the two main processes involved in downstream processing?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is a bioreactor?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Name the microorganism from which the thermostable DNA polymerase required for PCR is obtained?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Expand the term PCR.
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Name any two processes by which alien DNA is introduced into the host cell.
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention the bacteria that acts as natural genetic engineer.
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Name the sequence within a cloning vector from where the replication commences.
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are cloning vectors ?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is elution?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Which enzymes act as molecular glue?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What do you mean by recognition sequence?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are molecular scissors?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Define plasmid.
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is biotechnology ?
cbsc
class 12
biology
biotechnology : principles and process
sec-a
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are transgenic animals? Explain any four ways in which such animals can be beneficial to humans.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
What is ADA deficiency? Describe three methods to cure it.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
One of the main objectives of biotechnology is to minimise the use of insecticides on cultivated crops. Explain with the help of a suitable example, how insect-resistant crops have been developed using techniques of biotechnology.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Name the process involved in the production of nematode-resistant tobacco plants, using genetic engineering. Explain the strategy adopted to adopted to develop such plants.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
GMO’s have been useful to mankind. List about five useful GMO’s created so far and how they have been useful.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Explain the steps involved in the production of genetically engineered insulin?
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Gene therapy is a better alternative to the other measures taken for ADA deficiency. Why is it a better alternative ? What are the other methods used earlier? How can it be done?
cbsc
class 12
biology
biodiversity and its applications
sec-c
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Name a natural genetic engineer and state how it has been used to create pest resistant tobacco?
cbsc
class 12
biology
biodiversity and its applications
sec-c
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
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