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Recent questions in Biology
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CBSE XII
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Biology
Define polar vortex.
cbse
class12
biology
zoology
sec-a
asked
Dec 21, 2016
by
meena.p
1
answer
Expand GEAC.
cbse
class12
biology
botany
sec-a
asked
Dec 21, 2016
by
meena.p
1
answer
What is the medicinal use of cyclosporine A?
cbse
class12
biology
zoology
sec-a
asked
Dec 21, 2016
by
meena.p
1
answer
Which period is known as “Age of Amphibians”?
cbse
class12
biology
zoology
sec-a
asked
Dec 21, 2016
by
meena.p
1
answer
Name the three nonsense codons.
cbse
class12
biology
zoology
sec-a
asked
Dec 21, 2016
by
meena.p
1
answer
How does an electrostatic precipitator work? Differentiate between predation and parasitism; commensalism and ammensalism
cbse
class12
biology
botany
sec-e
asked
Dec 21, 2016
by
meena.p
1
answer
What is an operon? Explain. or Define bacterial transformation. Who demonstrated experimentally and how?
cbse
class12
biology
zoology
sec-e
asked
Dec 21, 2016
by
meena.p
1
answer
With the help of a neat labeled diagram , describe the reproductive system of human male. or Describe various natural methods of birth control
cbse
class12
biology
zoology
sec-e
asked
Dec 21, 2016
by
meena.p
1
answer
Rita and her parents were watching a TV serial in the evening. During a commercial break, an advertisement flashed on the screen that was promoting use of sanitary napkins. Rita was still watching the TV. The parents got embarrassed and changed the channel. Rita objected to her parents behavior and explained the need of these advertisements. a.What values did parents show? b.Briefly describe the phases of menstrual cycle c. Do you think such advertisements should be avoided or banned? Why?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 21, 2016
by
meena.p
1
answer
What is the relationship between species richness and area? What is the significance of the slope of regression?
cbse
class12
biology
zoology
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
Describe the specific adaptation of xerophytes w.r.t root, stem and leaves.
cbse
class12
biology
botany
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
What are GM crops? Highlight any 4 advantages of GM crops.
cbse
class12
biology
botany
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
What are recombinant proteins? How do bio reactors help in this production? or Why are restriction endonucleases called so? What is a palindromic sequence? How do restriction endonucleases act on palindromic sites to create ‘sticky ends’?
cbse
class12
biology
botany
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
Name the regions marked A,B and C
cbse
class12
biology
botany
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
In the figure, label X and Y and explain the functioning of the plant
cbse
class12
biology
botany
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
What are the measures that need to be taken for effective poultry farm management?
cbse
class12
biology
zoology
sec-c
asked
Dec 21, 2016
by
meena.p
1
answer
It was diagnosed by a specialist that the immune system of a patient has been suppressed. Describe the infection and the mechanism of penetration into the body.
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Given below is the diagrammatic representation of the experimental set up used by Miller for his experiment (a)Write the names of the different gases contained and the conditions set for reaction in flask A.(b)State the type of organic molecules he collected in the water at “B”. (c) Write the conclusions he arrived at?
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
List four symptoms of Down’s syndrome. What is the basis of this disorder?
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Draw a clover leaf structure of tRNA showing the following: a.Tyrosine attached to amino acid site. b.Anticodon for this amino acid in its correct site (codon for tyrosine is UAC) c.What does the actual structure of tRNA look like?
cbse
class12
biology
botany
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Give a schematic labeled diagram of oogenesis.
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
What is photochemical smog composed of? How does it affect plants?
cbse
class12
biology
botany
sec-b
asked
Dec 20, 2016
by
meena.p
1
answer
Why do bottled juices appear clearer than homemade ones?
cbse
class12
biology
zoology
sec-b
asked
Dec 20, 2016
by
meena.p
1
answer
What is metastasis? or Where are T-cells and B-cells formed? How do they differ from each other?
cbse
class12
biology
zoology
sec-b
asked
Dec 20, 2016
by
meena.p
1
answer
What is frame shift mutation? Name any one disease caused due to this mutation?
cbse
class12
biology
zoology
sec-b
asked
Dec 20, 2016
by
meena.p
1
answer
Draw a neat labeled diagram of a human sperm.
cbse
class12
biology
zoology
sec-b
asked
Dec 20, 2016
by
meena.p
1
answer
Name any two threatened animal species of India.
cbse
class12
biology
zoology
sec-a
asked
Dec 20, 2016
by
meena.p
1
answer
Development of a transgenic food crop may help in solving the problem of night blindness in the developing countries, name this crop plant
cbse
class12
biology
botany
sec-a
asked
Dec 20, 2016
by
meena.p
1
answer
Why is mutation breeding necessary for breeding for disease resistance?
cbse
class12
biology
zoology
sec-a
asked
Dec 20, 2016
by
meena.p
1
answer
Name the enzyme that joins the short pieces in the lagging strand during DNA synthesis.
cbse
class12
biology
zoology
sec-a
asked
Dec 20, 2016
by
meena.p
1
answer
What is a mutagen? Give an example.
cbse
class12
biology
zoology
sec-a
asked
Dec 20, 2016
by
meena.p
1
answer
What is extinction of species? Describe the processes that lead to extinction of species .Discuss the cause and effect of global warming . what measures need to be taken to control global warming?
cbse
class12
biology
zoology
sec-e
asked
Dec 20, 2016
by
meena.p
1
answer
What is meant by semi conservative nature of DNA replication? Who proved it and how? What does Oparin-Haldane hypothesis about life suggest? Explain.
cbse
class12
biology
zoology
sec-e
asked
Dec 20, 2016
by
meena.p
1
answer
Describe in brief the events of sexual reproduction.Describe the process of embryo and endosperm formation in flowering plants.
cbse
class12
biology
botany
sec-e
asked
Dec 20, 2016
by
meena.p
1
answer
Some parents wrote a complaint letter to the local municipality to remove all the hoardings in the city advertising the use of condoms and matters related to AIDS prevention. The children of these parents came to know about the matter and raised their voice against removal of hoardings. The parents were convinced by the awareness level of their children and withdrew their complaint a)Parents considered the hoardings as sight pollution. Why do you disagree? b)What value is promoted by the children protesting against their parents? c)What are the methods through which AIDS spread?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 20, 2016
by
meena.p
1
answer
What are the different approaches for biodiversity conservation in India.
cbse
class12
biology
botany
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
List the important characteristics of a population and explain.
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Explain the procedure of ELISA.
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Identify and explain the steps “A”, “B” and “C” in the PCR diagram given below
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Observe the given sequences of nitrogenous base on a DNA fragment and answer the questions:5’-CAGAATTCTTA-3’ 3’-GTCTTAAGAAT-5’ a.Name the restriction enzyme that can recognize this DNA sequence. 5’-CAGAATTCTTA-3’ 3’-GTCTTAAGAAT-5’ a. Name the restriction enzyme that can recognize this DNA sequence.b.Write the sequence after digestion. c.Why are ends generated after digestion called sticky end?
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Microbes can be used to decrease the use of chemical fertilizers and pesticides. Explain how this can be accomplished? or Name any three organic acids and the bacteria that produce them
cbse
class12
biology
botany
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
What is tissue culture? What are the steps involved in tissue culture?
cbse
class12
biology
botany
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
How does humoral immunity work when our body is infected?
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Given below is the schematic representation of Lac operon (a).Identify i and p (b).Name the inducer in this operon and explain its role.
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Name and explain the principle given by the equation $P^2 + 2PQ + Q^2=1$
cbse
class12
biology
zoology
sec-c
asked
Dec 20, 2016
by
meena.p
1
answer
Name the three major types of RNAs, specifying the function of each in the synthesis of polypeptide.
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
What will be the fate of the following structures in angiospermic plants? Ovary wall, ovule, zygote, outer integument, inner integument and primary endosperm nucleus?
cbse
class12
biology
botany
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
What is brood parasitism? Give an example
cbse
class12
biology
zoology
sec-b
asked
Dec 19, 2016
by
meena.p
1
answer
Draw a labeled diagram of an antibody molecule
cbse
class12
biology
zoology
sec-b
asked
Dec 19, 2016
by
meena.p
1
answer
Differentiate between convergent and divergent evolution
cbse
class12
biology
zoology
sec-b
asked
Dec 19, 2016
by
meena.p
1
answer
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