Recent questions tagged class 12

Why does 'Swiss-cheese' contain large holes?

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

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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?

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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

asked Apr 16, 2019 by priyanka.clay6

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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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Study the diagram and answer questions that follows:

asked Apr 16, 2019 by priyanka.clay6

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Study the following diagram and answer the following questions :

asked Apr 16, 2019 by priyanka.clay6

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Label a,b,c in the following diagram.

asked Apr 16, 2019 by priyanka.clay6

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What is the fate of inner cell mass in the blastocyst? Mention their significance.

asked Apr 16, 2019 by priyanka.clay6

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Name the part of the female reproductive system where the embryo is implanted. Mention the type of tissue by which it is made up of and give their functions?

asked Apr 16, 2019 by priyanka.clay6

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What is parturition? How is it induced? Which hormones are involved in induction of parturition?

asked Apr 16, 2019 by priyanka.clay6

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Differentiate between Leydig cells and Sertoli cells with reference to their location in the organ and their function

asked Apr 16, 2019 by priyanka.clay6

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Mention any three differences between spermatogenesis and oogenesis.

asked Apr 16, 2019 by priyanka.clay6

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From where do the signals for parturition originate and what does maternal pituitary release for simulating uterine contraction for child birth?

asked Apr 16, 2019 by priyanka.clay6

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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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Failure of fertilization leads to menstruation. Explain.

asked Apr 16, 2019 by priyanka.clay6

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Which cell organelle is present in the neck of the sperm? What is its significance?

asked Apr 16, 2019 by priyanka.clay6

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Why does fertilization take place in fallopian tube and not in uterus?

asked Apr 16, 2019 by priyanka.clay6

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