Recent questions tagged class 12

Why do children of metro cities of India suffer from allergies and asthma?

asked Apr 14, 2019 by priyanka.clay6

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Name the missing organisms/ diseases in the table given below.

asked Apr 14, 2019 by priyanka.clay6

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A group of viruses infect only nose and the respiratory passage but not the lungs. Mention the disease and its causative organism.

asked Apr 14, 2019 by priyanka.clay6

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What is the role of histamines in inflammatory response? Name few drugs which reduces the symptoms of allergy.

asked Apr 14, 2019 by priyanka.clay6

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What is the role of lymph nodes in our immune response ?

asked Apr 14, 2019 by priyanka.clay6

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Where are T cells and B cells formed? How do they differ from each other?

asked Apr 14, 2019 by priyanka.clay6

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Name the disease that is caused due to abnormal increase in Lymphocytes of blood.

asked Apr 14, 2019 by priyanka.clay6

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Which day is observed as World AIDS Day?

asked Apr 14, 2019 by priyanka.clay6

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Expand NACO

asked Apr 14, 2019 by priyanka.clay6

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Against which diseases does the MMR vaccine give protection ?

asked Apr 14, 2019 by priyanka.clay6

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Why is it organ transplantation always done between very close relatives?

asked Apr 14, 2019 by priyanka.clay6

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All human beings have Proto oncogenes. But all of them do not suffer from cancer. Why?

asked Apr 14, 2019 by priyanka.clay6

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Why is secondary immune response more intense than the primary immune response in humans.

asked Apr 14, 2019 by priyanka.clay6

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It was diagnosed by a specialist that the immune system of the body of a patient has been suppressed. Name the disease the patient is suffering from and its causative agent.

asked Apr 14, 2019 by priyanka.clay6

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How do virus-infected cells provide innate immunity to healthy cells?

asked Apr 14, 2019 by priyanka.clay6

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What causes swelling of the lower limbs in patients suffering from filariasis?

asked Apr 14, 2019 by priyanka.clay6

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What role do macrophages play in providing immunity to humans ?

asked Apr 14, 2019 by priyanka.clay6

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What type of virus causes AIDS? Name its genetic material.

asked Apr 14, 2019 by priyanka.clay6

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Some allergens trigger sneezing and wheezing in human beings. What causes this type of response by the body?

asked Apr 14, 2019 by priyanka.clay6

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How do interferons protect us?

asked Apr 14, 2019 by priyanka.clay6

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State the function of mast cells in allergic response.

asked Apr 14, 2019 by priyanka.clay6

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When does a human body elicit an anamnestic response ?

asked Apr 14, 2019 by priyanka.clay6

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What is the reason of shivering in malarial patient ?

asked Apr 14, 2019 by priyanka.clay6

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Which microorganism is used to produce hepatitis B Vaccine ?

asked Apr 14, 2019 by priyanka.clay6

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Name the two major groups of cells required to attain specific immunity.

asked Apr 14, 2019 by priyanka.clay6

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A person's nails and lips turn grey to bluish. Find out the disease he is suffering from. Name the pathogen.

asked Apr 14, 2019 by priyanka.clay6

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Name the pathogen that causes malignant malaria.

asked Apr 14, 2019 by priyanka.clay6

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Breast fed babies have greater immunity than bottle fed babies. Why?

asked Apr 14, 2019 by priyanka.clay6

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Name the vector that spreads Chikungunya.

asked Apr 14, 2019 by priyanka.clay6

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Name the confirmatory test for typhoid ?

asked Apr 14, 2019 by priyanka.clay6

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a.Name the primates that lived about 15 million years ago. List their characteristic features. b. Where was the first man-like animal found? c. Write the order in which Neanderthals, habilis and erectus appeared on the earth. State the brain capacity of each one of them. d. When did modern sapiens appear on this planet?

asked Apr 14, 2019 by priyanka.clay6

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How does Hardy-Weinberg equation explain genetic equilibrium ? Describe how this equilibrium gets disturbed which may lead to founder effect.

asked Apr 14, 2019 by priyanka.clay6

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Explain taking one example of vertebrate anatomy that evolution of life has occurred on earth. 'Nature selects for fitness'. Explain with suitable example.

asked Apr 14, 2019 by priyanka.clay6

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List the various causes of variations in the progeny of a population. Describe the three different ways in which natural selection operates in nature, with regard to organic evolution.

asked Apr 14, 2019 by priyanka.clay6

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How did Darwin's theory of natural selection explain the appearance of new forms of life on earth?

asked Apr 14, 2019 by priyanka.clay6

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Rearrange the following in an ascending order of evolutionary tree, reptiles, salamander, lobefins, frogs. Name two reproductive characters that make reptiles more successful than amphibians.

asked Apr 14, 2019 by priyanka.clay6

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Explain adaptive radiation and convergent evolution by taking examples of some Australian marsupials and Australian placental mammals OR (a) What is adaptive radiation? (b) Explain with the help of a suitable example, where adaptive radiation has occurred to represent convergent evolution.

asked Apr 14, 2019 by priyanka.clay6

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Name and explain the principle, the given equation represents : $p^2 + 2pq + q^2 = 1$

asked Apr 14, 2019 by priyanka.clay6

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Convergent evolution and divergent evolution are the two concepts explaining organic evolution. Explain each one with the help of an example.

asked Apr 14, 2019 by priyanka.clay6

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Branching descent and natural selection are the two key concepts of Darwinian theory of evolution. Explain each concept with the help of a suitable example.

asked Apr 14, 2019 by priyanka.clay6

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Study the schematic representation of evolutionary history of plant forms given below and mention: a. The plant form Ferns and Conifers are most related to. b. The nearest ancestors of flowering plants. c. The most primitive group of plants. d. Common ancestry Psilophyton provides to. e. The common ancestors of Psilophyton and seed ferns. f. The common ancestors of mosses and tracheophytes.

asked Apr 14, 2019 by priyanka.clay6

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Evolution is a change in the gene frequencies in a population in response to changes in the environment in a time scale of years and not centuries. Justify this statement with reference to DDT. How does the theory of Hugo de Vries support this?

asked Apr 14, 2019 by priyanka.clay6

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State the theory of abiogenesis. How does Miller's experiment support this theory? OR State the views of Oparin and Haldane on evolution. How does S.L. Miller's experiment support their views? OR Explain the theory of abiogenesis. How did Miller demonstrate experimentally the chemical evolution that happened three billion years ago?

asked Apr 14, 2019 by priyanka.clay6

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Explain the increase in the numbers of melanic (dark-winged) moths in the urban areas of post-industrialisation period in England. OR How does industrial melanism support Darwin's theory of Natural Selection? Explain.

asked Apr 14, 2019 by priyanka.clay6

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Anthropogenic action can hasten evolution. Explain with the help of a suitable example.

asked Apr 14, 2019 by priyanka.clay6

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What does the comparison between the eyes of Octopus and those of mammals say about their ancestry and evolution?

asked Apr 14, 2019 by priyanka.clay6

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How is genetic drift different from gene migration?

asked Apr 14, 2019 by priyanka.clay6

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How does 'fitness' of a population help in evolution?

asked Apr 14, 2019 by priyanka.clay6

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Give the sum total of all the allelic frequencies in a stable population. List any two factors which disturb the stability of a population. How does this disturbance affect the population?

asked Apr 14, 2019 by priyanka.clay6

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Why are the wings of butterfly and birds said to be analogous organs? Name the type of evolution, the analogous organs are a result of?

asked Apr 13, 2019 by priyanka.clay6

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