Recent questions tagged sec-c

In which part of human female reproductive system do the following events take place ? i. Release of 1st polar body ii. Release of 2nd polar body iii. Fertilization iv. Implantation

asked Apr 16, 2019 by priyanka.clay6

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Given below is an incomplete flow chart showing influence of hormones on gametogenesis in males. Observe the flow chart carefully and fill in the blanks A, B and C.

asked Apr 16, 2019 by priyanka.clay6

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The events of the menstrual cycle are represented below. Answer the questions following the

asked Apr 16, 2019 by priyanka.clay6

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Name the type of immunity that is present at the time of birth in humans. Explain any two ways by which it is accomplished.

asked Apr 14, 2019 by priyanka.clay6

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A person is suffering from ringworm disease. Mention the pathogen and the part of the human body affected. Give two symptoms of the disease along with two modes of transmission.

asked Apr 14, 2019 by priyanka.clay6

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A person is suffering from Ascariasis. Mention the pathogen causing the disease and an organ of the body affected, three symptoms and one mode of transmission of the disease.

asked Apr 14, 2019 by priyanka.clay6

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Explain the role of the following in providing defence against infection in human body : a. Histamine b. Interferons c. B – cells.

asked Apr 14, 2019 by priyanka.clay6

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(a) Name the stage of Plasmodium that gains entry into the human body. (b) Trace the stages of Plasmodium in the body of female Anopheles after its entry. (c) Explain the cause of periodic recurrence of chill and high fever during malarial attack in humans.

asked Apr 14, 2019 by priyanka.clay6

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Why lymph nodes and bone marrow are called lymphoid organs? Explain the functions of each of them.

asked Apr 14, 2019 by priyanka.clay6

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Name the stage of Plasmodium that is transmitted to human body by the vector. Describe the life cycle of the parasite in humans.

asked Apr 14, 2019 by priyanka.clay6

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Name the cells HIV attacks first when it gains entry into a human body. How does this virus replicate further to cause immunodeficiency in the body? OR A woman has tested positive for AIDS. Name the pathogen that infected her. How does the pathogen weaken her immune system?

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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Enlist four harmful effects caused to the humans living in areas having polluted air. Suggest two measures to reduce air pollution.

asked Apr 13, 2019 by priyanka.clay6

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Deforestation is creating a lot of problems in the environment. List the consequences of deforestation.

asked Apr 13, 2019 by priyanka.clay6

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During the past century, lakes and ponds in many parts of the earth have been gradually converted into land. (a) What is the phenomenon called? (b) How does human activity accelerate this phenomenon ? (c) What measures can we take to control this?

asked Apr 13, 2019 by priyanka.clay6

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Explain bio magnification of DDT in an aquatic food chain. How does it affect the bird population?

asked Apr 13, 2019 by priyanka.clay6

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Integrated organic forming is a cyclical zero waste procedure. Justify.

asked Apr 13, 2019 by priyanka.clay6

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People have been actively participating in the efforts for the conservation of forests. (i) Name the award instituted in respect of Amrita Devi to promote such efforts. (ii) Name the movement launched to protect the trees by hugging them. (iii) Name the step Government of India has undertaken in 1980.s to work closely with the local communities for protecting and managing forests.

asked Apr 13, 2019 by priyanka.clay6

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Many coastal areas may get submerged due to the environmental changes taking place at the present rate. Give the cause, and state two measures to check it.

asked Apr 13, 2019 by priyanka.clay6

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In general all pyramids are upright. Explain. What are the exceptions to this generalization?

asked Apr 10, 2019 by priyanka.clay6

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Justify the statement succession and evolution would have been parallel processes at that time when life started on earth.

asked Apr 10, 2019 by priyanka.clay6

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Describe pond as an ecosystem

asked Apr 10, 2019 by priyanka.clay6

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What are ecological pyramids? Mention its limitations.

asked Apr 10, 2019 by priyanka.clay6

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Give account of factors affecting the rate of decomposition.

asked Apr 10, 2019 by priyanka.clay6

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Detrivores like earthworm are involved in the process of decomposition of dead plants and animals. Describe the different steps involved in the process of decomposition.

asked Apr 10, 2019 by priyanka.clay6

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Ecosystems should carry a hefty price tag for its various services. Enlist six of them.

asked Apr 10, 2019 by priyanka.clay6

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Both carbon and phosphorus cycles are biogeochemical cycles but they differ in three aspects. List them.

asked Apr 10, 2019 by priyanka.clay6

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Draw a neat, labeled diagram of (a) simple stirred tank bioreactor (b) sparged tank bioreactor.

asked Apr 10, 2019 by priyanka.clay6

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Enumerate the major steps for isolation of DNA.

asked Apr 10, 2019 by priyanka.clay6

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Highlight the salient features that are required to facilitate cloning into a vector.

asked Apr 10, 2019 by priyanka.clay6

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Mention the steps involved in the separation and isolation of DNA fragments through agarose gel electrophoresis. Or Describe in brief the principle of DNA isolation through gel electrophoresis.

asked Apr 10, 2019 by priyanka.clay6

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Enlist the major steps in recombinant DNA technology.

asked Apr 10, 2019 by priyanka.clay6

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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?

asked Apr 9, 2019 by priyanka.clay6

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Name a natural genetic engineer and state how it has been used to create pest resistant tobacco?

asked Apr 9, 2019 by priyanka.clay6

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Indians have been producing and utilizing basmati rice, turmeric, neem etc. How can they be protected from biopiracy? Who is authorized to amend the rule? Name the basmathi rice that was patented by the USA in a different name.

asked Apr 9, 2019 by priyanka.clay6

1 answer

Turmeric is being used as a traditional medicine by Indians for a long time. The genetic material of this species was taken out of the country and a hybrid variety created. This 'New' variety was claimed as an invention by them. a. Do you think it is an invention ? b. How could we have restricted the movement of this material ? c. What term is used for such an act?

asked Apr 9, 2019 by priyanka.clay6

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A 4-year old girl suffered from ADA deficiency. She was cured by inserting a correct gene into her. a. What is this process called? b. In which cells are the genes introduced ? c. Name the vector used to introduce the gene?

asked Apr 9, 2019 by priyanka.clay6

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Why should farmers in India cultivate GM crops?

asked Apr 9, 2019 by priyanka.clay6

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How does agro bacterium help to increase Tobacco production?

asked Apr 9, 2019 by priyanka.clay6

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What are the potential risks of using GM food?

asked Apr 9, 2019 by priyanka.clay6

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