Recent questions tagged zoology

What is the function of amino acyl tRNA synthetase?

asked Dec 8, 2016 by meena.p

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Which one change is the cause of sickle cell anaemia?

asked Dec 8, 2016 by meena.p

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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?

asked Dec 8, 2016 by meena.p

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Give a brief account of asexual reproduction . and Draw a labeled sketch of a L.S. of a pistil showing porogamous type of fertilization.

asked Dec 8, 2016 by meena.p

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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?

asked Dec 8, 2016 by meena.p

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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.

asked Dec 8, 2016 by meena.p

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Name the biological end product made in transgenic animal to treat emphysema. Explain the same.

asked Dec 8, 2016 by meena.p

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Fill in the blanks in different columns of the table below to identify numbers 1 to 6.

asked Dec 8, 2016 by meena.p

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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.

asked Dec 8, 2016 by meena.p

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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?

asked Dec 7, 2016 by meena.p

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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.

asked Dec 7, 2016 by meena.p

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What are allergens? How do they cause inflammatory response in human body?

asked Dec 7, 2016 by meena.p

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Give chromosomal constitution and related *** in each of the following: a) Turner’s syndrome b) Klinefelter’s syndrome.

asked Dec 7, 2016 by meena.p

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Why does DNA move towards anode in gel electrophoresis?

asked Dec 7, 2016 by meena.p

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Name the two types of cells that produce antibodies?

asked Dec 7, 2016 by meena.p

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In which direction, the new strand of DNA is synthesized during DNA replication?

asked Dec 7, 2016 by meena.p

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Represent schematically and describe carbon cycle in an ecosystem.

asked Dec 7, 2016 by meena.p

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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.

asked Dec 7, 2016 by meena.p

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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.

asked Dec 7, 2016 by meena.p

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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?

asked Dec 7, 2016 by meena.p

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What do you mean by latitudinal gradient? What could be the possible reasons for the diversity being greater in tropic than in temperate region?

asked Dec 7, 2016 by meena.p

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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?

asked Dec 7, 2016 by meena.p

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How can we increase the success rate of fertilization during artificial insemination in animal husbandry programme?

asked Dec 6, 2016 by meena.p

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Mention three causes of drug abuse. Suggest some measure for the prevention and control of drug abuse.

asked Dec 6, 2016 by meena.p

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Which part of the world, Neanderthal man lived? What was his brain capacity? Mention the advancement which Neanderthal man showed over **** erectus.

asked Dec 6, 2016 by meena.p

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Distinguish between gametogenesis and embryogenesis.

asked Dec 6, 2016 by meena.p

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Enumerate two properties of cancer cells that distinguish them from normal cell.

asked Dec 6, 2016 by meena.p

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Why do sons of a haemophilic father never suffer from this trait?

asked Dec 6, 2016 by meena.p

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Mention different stages of sexual reproduction.Differentiate between geitonogamy and xenogamy.

asked Dec 6, 2016 by meena.p

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Name the genetically engineered human insulin.

asked Dec 6, 2016 by meena.p

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Name two curable sexually transmitted diseases.

asked Dec 6, 2016 by meena.p

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What is aneuploidy?

asked Dec 6, 2016 by meena.p

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Differentiate between regulators and conformers. Why do small animals do not show regulation?Represent schematically and describe the phosphorus cycle in an ecosystem.

asked Dec 5, 2016 by meena.p

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Explain chromosomal theory of inheritance.and Define mutations. Illustrate the type of mutations that arise by change in the chromosomal structure.

asked Dec 5, 2016 by meena.p

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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.

asked Dec 5, 2016 by meena.p

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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.

asked Dec 5, 2016 by meena.p

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What do you mean by bio diversity? What are the different types of bio diversity?

asked Dec 5, 2016 by meena.p

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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?

asked Dec 5, 2016 by meena.p

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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.

asked Dec 5, 2016 by meena.p

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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.

asked Dec 5, 2016 by meena.p

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What are heterogametes? What do we call these gametes individually?

asked Dec 2, 2016 by meena.p

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Expand MOET. How is it carried out?

asked Dec 2, 2016 by meena.p

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Differentiate between active and passive immunity.

asked Dec 2, 2016 by meena.p

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The map distance between a certain organisms genes A and B is 4 units, between B and C is 5 units and between C and D is 8 units. Which one of the gene pair will show more recombination frequency? Give reason. and Mention four reasons why Drosophila was chosen by Morgan for his experiments in genetics.

asked Dec 2, 2016 by meena.p

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Define ‘oestrous’ and ‘menstrual cycle’.

asked Dec 2, 2016 by meena.p

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Name any two man made eco system.

asked Dec 2, 2016 by meena.p

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What is the cause of speciation according to Hugo de Vries?

asked Dec 2, 2016 by meena.p

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Name one trait each in human and drosophila whose genes are located on the *** chromosome.

asked Dec 2, 2016 by meena.p

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Describe the exponential growth model of a diagram along with a curve.and Describe the logistic growth model of population along with a suitable curve. Why is this curve more realistic?

asked Dec 2, 2016 by meena.p

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Distinguish between asexual reproduction and sexual reproduction. Why is vegetative reproduction also considered a type of asexual reproduction? Which is a better mode of reproduction: Sexual or Asexual. Why? Draw an embryo sac of the flowering plant and label (i) central cell (ii) chalazal end (iii) synergids. Name the cell that develops an embryo sac. Mention the role played by various cells of embryo sac.

asked Dec 2, 2016 by meena.p

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