Biology Question Papers for Class 12 2009 Text

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general instruction for cbse question paper: i all the question are compulsory. Section a contains 8 question of one marks each, section b is of 10 questions of two marks each. Section c is of 9 question of three marks each and section d is of three question of five marks each.

However, an internal chouice has been provided in one question of 2 marks, one question of 3 marks and all the three question of 5 marks weightage. How does colostrum provide initial protection against diseases to new born infants? give one reason. Name the unlabelled areas 'a' and 'b' of the pie chart give above representing the global biodiversity of invertebrates showing their proportionate number of species of major taxa.

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Mention the type of evolution that has brought the similarity as seen in potato under and sweet potato. Mention the pollinating agent of an inflorescence of small dull coloured flowers with well exposed stamens and large feathery stigma. Explain the contributed of thermus aquaticus in the amplification of gene of interest. I what does the above diagram illustrate ii name the parts labelled 'a' and 'b' i name the type of cells that produce this module. How are they different from each other with respect to seeds where are fimbriae present in a human female reproductive system? give their function.

During the secondary treatment of the primary effluent how does the significant decrease in bod occur? 18. Study the figure given below and answer the questions: i how does the repressor molecule get inactivated? ii when does the transcription of lac mrna stop? i name the enzyme transcribed by the gene 'z' 19. How do they help in establishing the next type of vegetation? mention the type of climax community that will ultimately get established. At what stages does this parasite enter the human body? trace its life cycle in human body. The pedigree chart given below shows the inheritance of haemophilia in one family. What is the probability that their first child will be a haemophilic male? inheritance pattern of abo blood groups in humans shows dominance, codominance and multiple allelism. Name and explain the phenomenon that has resulted in the evolution of such diverse species in the region.

Explain giving reasons the existence of placement wolf and tasmanian wolf sharing the same habitat. How is the coding of galactosidase considered a better marker than the ones identification by you in the diagram? explain. Explain with the help of a diagram the development of a mature embryo sac from a megaspore mother cell in angiosperm. What did they conclude and how? two blood samples a and b picked up from the crime scene were handed over to the forensic department for genetic fingerprinting. How will be confirmed whether the sample belonged to the same individuals or two different individuals? 30.

One of the main objectives of biotechnology is to minimize the use of insecticide on the cultivation crops. Explain with the help of a suitable example how insect resistant crops have been developed using techniques of biotechnology. How is mature insulin different from proinsulin secreted by pancreas in human? b. Why id the functional insulin thus produced considered better than one used earlier by diabetic patients? our website offers comprehensive study notes for biology. The study notes and revision notes for school biology have been smartly handled by subject experts. We make sure that the audio visual format made use of by us is interesting and easy to understand. An unending supply of practice questions and activities that make concepts extremely clear, are some of the features of biology study material at meritnation.com.

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For concerns or suggestions please email us at [email protected] or call +91 9 800 8851 or +91 79 40061016 india or +1 646 926 7223 international. Section a contains 5 questions of one mark each, section b is of 10 questions of two marks each, section c is of 10 questions of three marks each and sec. Section a contains 5 questions of one mark each, section b is of 10 questions of two marks each, section c is of 10 questions of three marks each and section d is of 3 questions iv question numbers 1 to 5 are to be answered in one word or one sentence each. V question numbers 6 to 15 are to be answered in approximately 20 30 words each. Vi question numbers 16 to 25 are to be answered in approximately 30 50 words each.

Vii question numbers 26 to 28 are to be answered in approximately 80 120 words 1. What would happen to the rate of photosynthesis in c 3 plants if the co 2 concentration level almost doubles from its present level in the atmosphere. Due to uncontrolled excessive hunting the population of tigers in a forest becomes zero. Discuss the long term effects of this situation on the population of deer in that forest. Can all the four chambers of the human heart experience systole simultaneously? explain justifying your answer. What is the importance of f 0 mdash f 1 particles in atp production during aerobic respiration.

Name the two middle horizons of soil profile of tropical rain forests, and mention their 24. Distinguish between epimorphic and morphallactic regeneration, giving one example of 26. Name the category of plants which keep their stomata open during the night and closed during the day. Mention the difference in the structure of chloroplasts in the mesophyll cells and bundle sheath cells of such plants.

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general instruction for cbse question paper i all the questions are compulsory i there are no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks each. What is the electrostatics potential due to an electric dipole at an equatorial point ? 2. An electron does not suffer any deflection while passing through a region of uniform magnetic field. How would the angular separation of interference fringes in young's double slit experiment change when the distance between the slit and screen is doubled ? 5.

Draw 3 equipotential surfaces corresponding to field that uniformly increase in magnitude but remain constant. How are these surfaces different from that of a constant electric field along z direction ? 10.define electric flux. If the radius is reduced to half, how would the electric flux through the surfaces chnage ? 11. Plot a graph showing the variation of the angle of deviation with the angle of incidence. Answer the following questions: a optional and radio telescope are built on the ground while x ray astronomy is possible only from the satellites orbiting the earth. Why ? b the small ozone layers on top of the stratosphere is crucial for human survival.

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Increasing the current sensitivity may not necessarily increase the voltage sensitivity of a galvanometer. When does the intensity of transmitted light become maximum, when a polaroid sheet is rotated between two crossed polaroids ? 16. A the mass of a nucleus in its ground state is always less than the total mass of its constituents neutrons and protons. B plot a graph showing the variation of potential energy of a pair of nucleons as a function of their separation. Write the function of i transducer and ii repeater in the context of the communication system. A positive point charge +q is kept in the vicinity of an uncharged conducting plate. Sketch electric field lines originating from the point on the surface of the plate.

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