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Recent questions in Biology
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CBSE XII
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Biology
Why is productivity of coral reef maximum?
cbse
class12
biology
botany
sec-b
asked
Dec 7, 2016
by
meena.p
1
answer
How does a small amount of curd added to milk convert it into curd? or Name the alcoholic drinks produced in the following ways: By distillation and without distillation.
cbse
class12
biology
zoology
sec-b
asked
Dec 7, 2016
by
meena.p
1
answer
What are allergens? How do they cause inflammatory response in human body?
cbse
class12
biology
zoology
sec-b
asked
Dec 7, 2016
by
meena.p
1
answer
Give chromosomal constitution and related *** in each of the following: a) Turner’s syndrome b) Klinefelter’s syndrome.
cbse
class12
biology
zoology
sec-b
asked
Dec 7, 2016
by
meena.p
1
answer
Why pollen grains can remain well preserved in fossils?
cbse
class12
biology
botany
sec-b
asked
Dec 7, 2016
by
meena.p
1
answer
Define stratification
cbse
class12
biology
botany
sec-a
asked
Dec 7, 2016
by
meena.p
1
answer
Why does DNA move towards anode in gel electrophoresis?
cbse
class12
biology
zoology
sec-a
asked
Dec 7, 2016
by
meena.p
1
answer
Name the two types of cells that produce antibodies?
cbse
class12
biology
zoology
sec-a
asked
Dec 7, 2016
by
meena.p
1
answer
In which direction, the new strand of DNA is synthesized during DNA replication?
cbse
class12
biology
zoology
sec-a
asked
Dec 7, 2016
by
meena.p
1
answer
What genetic principle would be derived from a monohybrid cross?
cbse
class12
biology
botany
sec-a
asked
Dec 7, 2016
by
meena.p
1
answer
Represent schematically and describe carbon cycle in an ecosystem.
cbse
class12
biology
zoology
sec-e
asked
Dec 7, 2016
by
meena.p
1
answer
Colour blindness is a recessive trait. A couple with normal vision have two sons, one with colour blindness and one with a normal vision. If the couple had daughters, what proportion of them will have a normal vision? Explain with the help of a pedigree diagram.OR Where do transcription and translation take place in a prokaryotic cell? Describe the three steps in transcription.
cbse
class12
biology
zoology
sec-e
asked
Dec 7, 2016
by
meena.p
1
answer
Give the term/reason a.Mechanism responsible for parturition. b.Role of oxytocin during expulsion of the baby out of uterus. c.Why do pellucida block the entry of additional sperm? d.Sperms cannot reach ovum without seminal plasma. e. All copulations do not lead to fertilization and pregnancy. or Describe various natural methods of contraception in human beings.
cbse
class12
biology
zoology
sec-e
asked
Dec 7, 2016
by
meena.p
1
answer
During a visit to Kedarnath, Mohan came across a young couple staying in the adjacent room in the hotel. He learnt that the couple had been visiting different temples and performing rituals to get a child. Mohan was astonished and explained to them about ART which he had learnt in the biology class recently. The couple were happy and understood the wrong approach and thanked Mohan. a.Identify the values shown by Mohan. b)What is ART? What are the various methods of ART? c)What are the limitations for which ART is not commonly accepted?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 7, 2016
by
meena.p
1
answer
What do you mean by latitudinal gradient? What could be the possible reasons for the diversity being greater in tropic than in temperate region?
cbse
class12
biology
zoology
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
Deforestation is creating a lot of problems in the environment. List the consequences of deforestation.
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
Name the four major ecosystem services? Who gave the price tags on nature’s life support services? Which is the most important ecosystem service provided?
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
What are the three critical areas of research in bio technology?
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
In the given figure,Form (A) and Form (B) represents different forms of a proteinaceous hormone secreted by pancreas in mammals a. What type of bonding is present between the chains of this hormone? b. What are these forms (A) and (B)? How do these forms differ from each other? c. Explain how this hormone was produced by Eli Lilly, an American company?
cbse
class12
biology
zoology
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
Since DNA is hydrophilic, it cannot pass through the cell membrane. Name and explain the technique that DNA is forced into a) bacterial cell b) a plant cell c) an animal cell.
cbse
class12
biology
botany
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
What are bio fertilizers? A farmer was advised to add a culture of the bacterium in the soil before sowing the crop. Name the bacterium in the culture. How is this bacterium useful to the crop?
cbse
class12
biology
botany
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
How can we increase the success rate of fertilization during artificial insemination in animal husbandry programme?
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Mention three causes of drug abuse. Suggest some measure for the prevention and control of drug abuse.
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Which part of the world, Neanderthal man lived? What was his brain capacity? Mention the advancement which Neanderthal man showed over **** erectus.
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
In Antirrhinum majus, a plant with red flower was crossed with white flowers. Work out all the possible genotypes and phenotypes of $F_1$ and $F_2$ generations. Comment on the pattern of inheritance in this case. or Enlist the goals of Human Genome Project.
cbse
class12
biology
botany
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Distinguish between gametogenesis and embryogenesis.
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Study the pie-diagram and answer the questions which follows : What do A, B, C and D represent in these diagrams.
cbse
class12
biology
botany
sec-b
asked
Dec 6, 2016
by
meena.p
1
answer
Why are cyanobacteria considered useful in paddy plants?
cbse
class12
biology
botany
sec-b
asked
Dec 6, 2016
by
meena.p
1
answer
Enumerate two properties of cancer cells that distinguish them from normal cell.
cbse
class12
biology
zoology
sec-b
asked
Dec 6, 2016
by
meena.p
1
answer
Why do sons of a haemophilic father never suffer from this trait?
cbse
class12
biology
zoology
sec-b
asked
Dec 6, 2016
by
meena.p
1
answer
Mention different stages of sexual reproduction.Differentiate between geitonogamy and xenogamy.
cbse
class12
biology
zoology
sec-b
asked
Dec 6, 2016
by
meena.p
1
answer
Expand IUCN and MAB.
cbse
class12
biology
botany
sec-a
asked
Dec 6, 2016
by
meena.p
1
answer
Name the genetically engineered human insulin.
cbse
class12
biology
zoology
sec-a
asked
Dec 6, 2016
by
meena.p
1
answer
Name two curable sexually transmitted diseases.
cbse
class12
biology
zoology
sec-a
asked
Dec 6, 2016
by
meena.p
1
answer
Name the process in which unwanted mRNA regions are removed and wanted regions are joined.
cbse
class12
biology
botany
sec-a
asked
Dec 6, 2016
by
meena.p
1
answer
What is aneuploidy?
cbse
class12
biology
zoology
sec-a
asked
Dec 6, 2016
by
meena.p
1
answer
Differentiate between regulators and conformers. Why do small animals do not show regulation?Represent schematically and describe the phosphorus cycle in an ecosystem.
cbse
class12
biology
zoology
sec-e
asked
Dec 5, 2016
by
meena.p
1
answer
Explain chromosomal theory of inheritance.and Define mutations. Illustrate the type of mutations that arise by change in the chromosomal structure.
cbse
class12
biology
zoology
sec-e
asked
Dec 5, 2016
by
meena.p
1
answer
Study the given diagram: a)Pick out and name the cells that undergo spermiogenesis. b)Name the cells ‘a’ and ‘b’. c)Give the ploidy level of ‘b’ and ‘e’. d)What are the cells marked as ‘f’? Mention their functions. e)Mention the cell division type in ‘a’ and ‘b’. and Briefly explain the various reproductive technologies to assist infertile couple to have children.
cbse
class12
biology
zoology
sec-e
asked
Dec 5, 2016
by
meena.p
1
answer
Ratan lives in a remote village. Suddenly, he comes to know that his father has arranged the marriage of younger sister who is barely 14 years old, to a well-to-do middle aged man living in a nearby village. Ratan objected to his father’s act. Ratan was not convinced by his father’s saying that a better groom might not be available later. Ratan complained to the village head and got the problems solved.a. Did Ratan act properly by approaching the village head? Why or why not?b. What biological considerations made Ratan object to his father’s decision? c. What values and responsibilities did Ratan show?
cbse
class12
biology
sec-d
value-based-question
asked
Dec 5, 2016
by
meena.p
1
answer
What is biological magnification? Explain how DDT as a water pollutant undergoes biological magnification.and Species facing competition might evolve mechanism that promotes coexistence rather than exclusion. Justify this statement in light of Gauss’ competitive exclusion principle, citing a suitable example.
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
What do you mean by bio diversity? What are the different types of bio diversity?
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Mention the tools required for genetic engineering technology.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Plasmid is a boon to biotechnology. Justify your statement quoting the production of human insulin as an example.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Describe any three vector less methods of introducing rDNA into a competent host cell.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
What is biological oxygen demand test? At what stage of sewage treatment is this test performed? BOD levels of three samples of water labeled as A,B and C are $30\;mg/ml, 10\;mg/ml$ and $500\;mg/ml$ respectively. Which sample of water is most polluted?
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
What is mutation? Explain the significance of mutation in plant breeding. Give an example of disease resistant variety of cultivated plants induced by mutation.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
In the figure, structure of the antibody molecule is shown. Observe it and give the answers to the following:a) Label the parts A,B and C.b)Which cell produces these chemicals? c) State the function of this molecule.
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Stanley Miller and Urey performed an experiment by recreating in the laboratory the probable conditions of the primitive atmosphere of the earth. a.What was the aim of the experiment? b.In what form was the energy supplied for the chemical reactions to occur? c.For how long was the experiment run continuously? Name the two products formed.
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Explain how hnRNA becomes mRNA?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
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