Recent questions tagged sec-c

How will you measure population density in following cases ? a) Fish in a lake b) Tiger census in a national park c) Single huge banyan tree with large canopy.

asked Apr 23, 2019 by priyanka.clay6

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Darwin showed that even a slow growing animal like elephant could reach enormous number in absence of checks. With the help of your understanding of growth models, explain when is this possible? Why is this notion unrealistic?

asked Apr 23, 2019 by priyanka.clay6

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How does Ophrys get pollinated by bees?

asked Apr 23, 2019 by priyanka.clay6

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What is brood parasitism? Give an example. What adaptation has evolved in this phenomenon?

asked Apr 23, 2019 by priyanka.clay6

1 answer

Anand on a visit through an under the ocean aquarium found that many sea anemones are attached to hermit crab shells, sucker fisher attached to the ventral surface of sharks and clown fish living among the sea anemones. He wondered whether all these associations are of the same type; can you help him to arrive at the correct conclusion.

asked Apr 23, 2019 by priyanka.clay6

1 answer

Mr. Ram on a trip to Rohtang Pass suddenly experienced heart palpitations, nausea, fatigue etc on reaching the destination. Suggest the reasons for his sudden deterioration of health and also state whether his body will withstand this problem if he stays there for long and how?

asked Apr 23, 2019 by priyanka.clay6

1 answer

(i) How and at what stage does Plasmodium enter into a human body ? (ii) Why does the victim show symptoms of high fever? (iii)With the help of a flow chart only, show the stages of asexual reproduction in the life cycle of the parasite in the infected human.

asked Apr 22, 2019 by priyanka.clay6

1 answer

A person claimed that he has seen sounds, heard colours and smelt light. a. What could be the possible reason ? b. Name two chemicals responsible for this condition. c. Mention any one source for these chemicals.

asked Apr 22, 2019 by priyanka.clay6

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A patient has lost his immunity. a. Name the disease associated with it. b. Name the confirmatory test to diagnose the disease. c. Why did he lose his immunity?

asked Apr 22, 2019 by priyanka.clay6

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Why should biological control of pests and pathogens be preferred to the conventional use of chemical pesticides? Explain how the following microbes act as biocontrol agents: (a) Bacillus thuringiensis (b) Nucleopolyhedrovirus.

asked Apr 20, 2019 by priyanka.clay6

1 answer

One student has drawn mRNA but he made some mistake in codons

asked Apr 20, 2019 by priyanka.clay6

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asked Apr 19, 2019 by priyanka.clay6

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If a nucleosome contain 200 bps. How many nucleosome are there in a mamalian cell? What changes occur to beads of string of D.N.A during metaphase?

asked Apr 19, 2019 by priyanka.clay6

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Two persons filed a case against a lady claiming to be the father of her only daughter. How to identify the real biological father?

asked Apr 19, 2019 by priyanka.clay6

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Write short notes on RNA polymerases of eukaryotic cells?

asked Apr 19, 2019 by priyanka.clay6

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DNA is the genetic material in most of the organisms, while RNA is the genetic material in a few viruses. What are the four general/common functions performed by RNA in other organisms?

asked Apr 19, 2019 by priyanka.clay6

1 answer

(a) What are the transcriptional products of RNA polymerase III ? (b) Differentiate between 'capping' and 'tailing' (c) Expand hnRNA

asked Apr 19, 2019 by priyanka.clay6

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It is established that RNA is the first genetic material. Explain giving three reasons?

asked Apr 19, 2019 by priyanka.clay6

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Explain the role of $^{35}S$ and $^{32}P$ in the experiments conducted by Hershey and Chase?

asked Apr 19, 2019 by priyanka.clay6

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Explain the two major approaches involved in the sequencing of genomes.

asked Apr 19, 2019 by priyanka.clay6

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How is Lac operon ―switched on‖ in an E.coli cell ?

asked Apr 19, 2019 by priyanka.clay6

1 answer