Recent questions tagged biology

Bacteria that convert effluent into activated sludge play one more beneficial side. Mention the role.

asked Apr 17, 2019 by priyanka.clay6

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It was observed that certain plant roots are infected by fungus. in spite of this infection the plant showed increased growth and development. Give reason.

asked Apr 17, 2019 by priyanka.clay6

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A farmer was suggested to apply certain microbial culture in his field to increase the yield. Suggest the types of microbes he could use in his paddy field and how do they help in increasing the yield.

asked Apr 17, 2019 by priyanka.clay6

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(a) Patients who have undergone myocardial infarction are given clot buster. Mention the clot buster administered and its microbial source. (b) A person recuperating from illness is advised to have curd regularly. Why?

asked Apr 17, 2019 by priyanka.clay6

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Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

asked Apr 17, 2019 by priyanka.clay6

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Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) in it.

asked Apr 17, 2019 by priyanka.clay6

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During the secondary treatment of primary effluents, how does a significant decrease in BOD occur?

asked Apr 17, 2019 by priyanka.clay6

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Name the enzyme produced by Streptococcus bacterium. Explain its importance in medical sciences.

asked Apr 17, 2019 by priyanka.clay6

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Why are some molecules called bioactive molecules? Give two examples of such molecules.

asked Apr 17, 2019 by priyanka.clay6

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Name the source of statin and state its action on the human body.

asked Apr 17, 2019 by priyanka.clay6

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Name the source of streptokinase. How does this bioactive molecule function in our body?

asked Apr 17, 2019 by priyanka.clay6

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Why is Rhizobium categorised as a 'symbiotic bacterium'. How does it act as a biofertiliser?

asked Apr 17, 2019 by priyanka.clay6

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List four advantages that a symbiotic mycorrhizal association provides to the host plant.

asked Apr 17, 2019 by priyanka.clay6

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How does 'starter' added to milk help it set into curd?

asked Apr 17, 2019 by priyanka.clay6

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Name the bacterium responsible for the large holes in 'Swiss cheese'. What are these holes due to?

asked Apr 17, 2019 by priyanka.clay6

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Why does 'Swiss-cheese' contain large holes?

asked Apr 17, 2019 by priyanka.clay6

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Microbes release gases during metabolism. How will it help in the production of energy?

asked Apr 17, 2019 by priyanka.clay6

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Why are some microbes useful in detergent formulation?

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Antibiotics are always sold in combination with lactobacillus. Why?

asked Apr 17, 2019 by priyanka.clay6

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The excreta of cattle do not contain any cellulose but human excreta may contain cellulose. Why?

asked Apr 17, 2019 by priyanka.clay6

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How do lactic acid bacteria help in increasing the nutritional quality of curd?

asked Apr 17, 2019 by priyanka.clay6

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On fermentation the dough of idli and dosa puffs up. Which metabolic pathway is responsible for this process?

asked Apr 17, 2019 by priyanka.clay6

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Consuming curd keeps the gastro-intestinal tract in tact. Give reason.

asked Apr 17, 2019 by priyanka.clay6

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A small amount of curd was added to cold milk for converting it into curd. But milk did not get curdled. Why?

asked Apr 17, 2019 by priyanka.clay6

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Scientists have succeeded in introducing toxin gene of Bacillus thuringiensis into plants like cotton. What purpose is achieved through this action?

asked Apr 17, 2019 by priyanka.clay6

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An organic farmer requires a bio control agent which is species specific and has no negative impact on non-target organism. Suggest the name of such a bio control agent.

asked Apr 17, 2019 by priyanka.clay6

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Which one of these is a proteinaceous infecting agent?

asked Apr 17, 2019 by priyanka.clay6

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Bottled juices are clearer compared to homemade juice. Give reason.

asked Apr 17, 2019 by priyanka.clay6

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Can we imagine a world without antibiotics? Explain briefly.

asked Apr 17, 2019 by priyanka.clay6

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Drinks like Whisky and Rum are more intoxicating than wine. Why?

asked Apr 17, 2019 by priyanka.clay6

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Name the type of association that the genus Glomus exhibits with higher plants.

asked Apr 17, 2019 by priyanka.clay6

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Which of the following is a cyanobacterium that can fix atmospheric nitrogen ? Azospirillum, Oscillatoria, Spirulina.

asked Apr 17, 2019 by priyanka.clay6

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Which of the following is a free-living bacterium that can fix nitrogen in the soil? Spirulina, Azospirillum, Sonalika.

asked Apr 17, 2019 by priyanka.clay6

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Why is sewage water treated until the BOD is reduced? Give a reason.

asked Apr 17, 2019 by priyanka.clay6

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Milk starts to coagulate when Lactic Acid Bacteria (LAB) is added to warm milk as a starter. Mention any two other benefits which LAB provide.

asked Apr 17, 2019 by priyanka.clay6

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Mention the information that the health workers derive by measuring BOD of a water body.

asked Apr 17, 2019 by priyanka.clay6

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Mention the role of cyanobacteria as a biofertiliser.

asked Apr 17, 2019 by priyanka.clay6

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What makes the nucleopolyhedrovirus a desirable biological control agent?

asked Apr 17, 2019 by priyanka.clay6

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Name the gas released and the process responsible for puffing up of the bread dough when Saccharomyces cerevisiae is added to it.

asked Apr 17, 2019 by priyanka.clay6

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Name the nutrient that gets enhanced while curdling of milk by Lactobacillus.

asked Apr 17, 2019 by priyanka.clay6

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Furnish the technical term for the following: a) Cushion of fatty tissue covered by skin and pubic hair in female external genitalia. b) The finger like projections which collect ovum after ovulation c) The middle thick layer/wall of uterus. d) Semen without sperm e) The finger-like projections appearing on the trophoblast after implantation.

asked Apr 16, 2019 by priyanka.clay6

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Women are often blamed for giving birth to girl child in our society. What is your view?

asked Apr 16, 2019 by priyanka.clay6

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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 does zona pellucida layer block the entry of additional sperms? d) Sperm cannot reach ovum without seminal plasma. e) All copulations do not lead to fertilization and pregnancy.

asked Apr 16, 2019 by priyanka.clay6

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What are the main features of embryonic development at various months of pregnancy?

asked Apr 16, 2019 by priyanka.clay6

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What is placenta? What is its role? Justify Placenta as an endocrine tissue.

asked Apr 16, 2019 by priyanka.clay6

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Draw a diagrammatic presentation of various events during a menstrual cycle.

asked Apr 16, 2019 by priyanka.clay6

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Explain the stages of embryo development from fertilization to implantation.

asked Apr 16, 2019 by priyanka.clay6

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Explain different phases of oogenesis with schematic representation

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Explain different phases of spermatogenesis with schematic representation.

asked Apr 16, 2019 by priyanka.clay6

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What is seminiferous tubule? Name the various types of cells present in it and explain its function.

asked Apr 16, 2019 by priyanka.clay6

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