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Recent questions in Biology
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CBSE XII
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Biology
What is inter specific hybridization? Give an example. or Differentiate between inbreeding and outbreeding in animals
cbse
class12
biology
zoology
sec-b
asked
Dec 19, 2016
by
meena.p
1
answer
State two functions of human placenta.
cbse
class12
biology
zoology
sec-b
asked
Dec 19, 2016
by
meena.p
1
answer
State Allen’s rule.
cbse
class12
biology
zoology
sec-a
asked
Dec 19, 2016
by
meena.p
1
answer
Name the technique used for amplification of DNA.
cbse
class12
biology
zoology
sec-a
asked
Dec 19, 2016
by
meena.p
1
answer
Name any two semi dwarf varieties of wheat introduced into all wheat growing places of India
cbse
class12
biology
botany
sec-a
asked
Dec 19, 2016
by
meena.p
1
answer
Name the common ancestor of ape and a man.
cbse
class12
biology
zoology
sec-a
asked
Dec 19, 2016
by
meena.p
0
answers
Name the common ancestor of ape and a man.
cbse
class12
biology
zoology
sec-a
asked
Dec 19, 2016
by
meena.p
1
answer
What is a test cross?
cbse
class12
biology
zoology
sec-a
asked
Dec 19, 2016
by
meena.p
1
answer
Give an account of factors affecting rate of decomposition.Write a short note on the pyramid of numbers and pyramid of biomass.
cbse
class12
biology
zoology
sec-e
asked
Dec 19, 2016
by
meena.p
0
answers
Give an account of factors affecting rate of decomposition.Write a short note on the pyramid of numbers and pyramid of biomass.
cbse
class12
biology
zoology
sec-e
asked
Dec 19, 2016
by
meena.p
1
answer
Differentiate between dominance, co dominance and incomplete dominance with an example for each.or A dihybrid heterozygous tall and yellow pea plant was crossed with a double recessive plant.A dihybrid heterozygous tall and yellow pea plant was crossed with a double recessive plant.a)What type of cross is this? b)Work out the genotype and phenotype of progeny c)What principle of Mendel is illustrated through the result of this cross?
cbse
class12
biology
zoology
sec-e
asked
Dec 19, 2016
by
meena.p
1
answer
Explain the formation of an embryo sac with diagrams.or Explain the formation of an embryo sac with diagrams.
cbse
class12
biology
botany
sec-e
asked
Dec 19, 2016
by
meena.p
1
answer
On world population day, Rohit and his friends arranged an awareness campaign programme in their locality. Some elderly people rebuked the children and asked them not to talk on such things in public. The children convinced the elders about the need of the programme and on the understanding their point of view, they also joined the campaign a.) What values did elderly people and Rohit show on the occasion? b)Why is such an awareness programme necessary? c)What role the government has played in controlling population explosion?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 19, 2016
by
meena.p
1
answer
Study the table given below and fill in the blanks from A to F
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
How will you measure the population densities in the following cases:a)Fish in a lake b)Tiger census in a national park c)Single huge banyan tree with a large canopy
cbse
class12
biology
botany
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
A selectable marker is used in the selection of recombinants on the basis of their ability to produce colour in the presence of the chromogenic substrate. a) Mention the name of the mechanism involved. b)Which enzyme is involved in the production of the colour?c)How is it advantageous over using antibiotic resistant gene as a selectable marker?
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
Explain the effect of deletion of the gene in an individual. How does gene therapy help in this case?
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
Why is Agarobacterium mediated genetic engineering transformation in plants is considered as a natural genetic engineering?
cbse
class12
biology
botany
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
What is biogas? How is it produced and name the microbes involved in the biogas production?
cbse
class12
biology
botany
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
What measures would you undertake to improve the quality & quantity of milk production?
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
What is immunity? List four barriers that protect the body from the entry of foreign agents. or The outline structure of a drug is given below a)Which group of drugs does this represent? b) What are the modes of consumption of these drugs? c. Name the organ of the body that is affected by the consumption of these drugs.
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
Look at the diagram and answer the following :a)Mention the specific geographical region where these organisms are found.b)Name and explain the phenomenon that has resulted in the evolution of such diverse species in a region. c)Explain giving reasons the existence of placental wolf and Tasmanian wolf sharing the same habitat.
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
There are 64 codons in the genetic code dictionary.a)How many of them code for an amino acid? b)How many aminoacids are coded? c)Which term do you give these codons that do not code for aminoacid?
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
Explain *** determination mechanism in humans. How is it different in birds?
cbse
class12
biology
zoology
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
Continued self pollination leads to interbreeding depression. List three devices that flowering plants have developed to discourage self pollination.
cbse
class12
biology
botany
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
Give any two examples of defense mechanism in plants against herbivory.OR What are the four levels of biological organization with which ecology basically deals with?
cbse
class12
biology
botany
sec-b
asked
Dec 8, 2016
by
meena.p
1
answer
What is germplasm? Why is it necessary to have a germplasm collection?
cbse
class12
biology
zoology
sec-b
asked
Dec 8, 2016
by
meena.p
1
answer
What are auto immune diseases? Give two examples.
cbse
class12
biology
botany
sec-b
asked
Dec 8, 2016
by
meena.p
1
answer
Why is it essential that tRNA binds to both aminoacids and mRNA during protein synthesis?
cbse
class12
biology
zoology
sec-b
asked
Dec 8, 2016
by
meena.p
1
answer
Why are cleistogamous flowers invariably autogamous?
cbse
class12
biology
botany
sec-b
asked
Dec 8, 2016
by
meena.p
1
answer
Which enzymes are known as “molecular scissors”?
cbse
class12
biology
zoology
sec-a
asked
Dec 8, 2016
by
meena.p
1
answer
Give the scientific name of the causative organism of elephantiasis.
cbse
class12
biology
botany
sec-a
asked
Dec 8, 2016
by
meena.p
1
answer
What is the function of amino acyl tRNA synthetase?
cbse
class12
biology
zoology
sec-a
asked
Dec 8, 2016
by
meena.p
1
answer
Which one change is the cause of sickle cell anaemia?
cbse
class12
biology
zoology
sec-a
asked
Dec 8, 2016
by
meena.p
1
answer
How do plants and animals adapt to water scarcity?OR Explain briefly the ‘rivet popper hypothesis’ by Paul Ehrlich.
cbse
class12
biology
botany
sec-e
asked
Dec 8, 2016
by
meena.p
1
answer
What do the following represent in a given graph? Describe one evidence that decisively prove that birds have evolved from reptiles?a. If operation of natural selection makes peak higher and narrower.b. If peak shifts to right directionc. If two peaks are formed instead.OR By taking industrial melanism as an example, explain the concept of natural selection by evolution. What is the role of variation in evolution?
cbse
class12
biology
zoology
sec-e
asked
Dec 8, 2016
by
meena.p
1
answer
Give a brief account of asexual reproduction . and Draw a labeled sketch of a L.S. of a pistil showing porogamous type of fertilization.
cbse
class12
biology
zoology
sec-e
asked
Dec 8, 2016
by
meena.p
1
answer
A teenage girl accidently became pregnant . she stopped coming to college and also preferred to remain insolated. She was scared to inform her parents. One of her friends Shwetha, met her and came to know about her problem. She took her to a doctor and got her aborted. She convinced her parents and kept the matter concealed. a. Did Shwetha take correct decision? What values did she show? b. What is the medical term for abortion? What is the period considered safe for abortion? c. What prevention may be taken to avoid pregnancy?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 8, 2016
by
meena.p
1
answer
Mention the three major causes for the loss of bio diversity.
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
What is the pyramid of biomass? Represent the pyramid of biomass in a )grassland ecosystem b) aquatic ecosystem
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Some multinational companies and other organizations are using bio resources for commercial benefits without proper authentication and compensation to concerned authorities. a. Give the term for this unauthorized act. b. Suggest two ways to get rid of this.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Name the biological end product made in transgenic animal to treat emphysema. Explain the same.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
How will you obtain a purified DNA from a cell?
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Biofortification is the most practical means to improve human health. Justify the statement with examples.What is mutation? Explain the significance of mutation in plant breeding. Give an example of a disease resistant variety of cultivated plant induced by mutation.
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Fill in the blanks in different columns of the table below to identify numbers 1 to 6.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Explain test cross with an example and a Punnet squares
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Study the following pedigree chart of a family starting with mother with blood group AB and father with “O” blood group. a. Mention the blood group as well as genotype of the offspring numbered 1 in Generation-II. b. Write the possible blood groups as well as the genotypes of the offspring numbered 2 and 3 in generation III.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Illustrate schematically the process of initiation, elongation and termination during transcription of a gene in a bacterium.
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Figures given below are of Darwin’s finches a. Mention the specific geographical area where they are found? b. Name and explain the phenomenon that has resulted in the evolution of such diverse species in the region.c. How did Darwin visit particular geographical area?
cbse
class12
biology
zoology
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
List the changes that occur during post fertilization in plants.
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
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