Science (English Medium)
Academic Year: 2021-2022
Date & Time: 30th May 2022, 10:30 am
Duration: 2h
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General Instructions:
- This question paper contains 13 questions. All questions are compulsory.
- The question paper has three sections - Section A, B and C.
- Section - A has 6 questions of 2 marks each. Section - B has 6 questions of 3 marks each, and Section - C has a case based question of 5 marks.
- There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
- Wherever necessary, neat and properly labelled diagrams should be drawn.
Observe the schematic representation given above and answer the following questions:
- Identify A and B.
- Calculate the growth rate of bacteria in a curd sample, where 1 million bacteria increased to two million, within a period of one hour.
Chapter: [0.11] Organisms and Populations
Identify the type of pyramid given above. Write the identifying feature on the basis of which you identified it.
Chapter: [0.11] Organisms and Populations
A boy developed some allergic reactions when he straight entered into his air conditioned room after a game of football outside his house. Write any two symptoms that could be noticed in such condition. How does our body combat such conditions?
Chapter: [0.07] Human Health and Diseases
Write the Scientific name of the plant from where natural Cannabinoids are obtained.
Chapter: [0.07] Human Health and Diseases
Mention the parts of the plant that are used for extracting the drug.
Chapter: [0.07] Human Health and Diseases
How does the drug affect human body?
Chapter: [0.07] Human Health and Diseases
Epithelial lining of our intestine is considered as secondary lymphoid organ. Justify the statement.
Chapter: [0.07] Human Health and Diseases
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What are flocs with respect to sewage treatment?
Chapter: [0.08] Microbes in Human Welfare
Explain the role of the flocs during the sewage treatment.
Chapter:
How are ‘in-situ’ and ‘ex-situ’ approaches of biodiversity conservations different from each other?
Chapter:
Farmers are often suggested to use the following organism in their crop land so as to improve the soil fertility. Explain.
Rhizobium
Chapter: [0.08] Microbes in Human Welfare
Farmers are often suggested to use the following organism in their crop land so as to improve the soil fertility. Explain.
Anabaena
Chapter: [0.08] Microbes in Human Welfare
Restriction endonucleases are used in genetic engineering to form recombinant DNA. Explain only with the help of a flow chart the steps carried in the formation of a recombinant DNA.
Chapter:
Write the inference drawn by Alexander von Humboldt after his extensive explorations of South American jungle.
Chapter: [0.13] Biodiversity and Its Conservation
Study the graph given below:
As per Alexander von Humboldt, what do the symbols S, A, Z and C in the graph stand for, in respect of a species and area relationship?
Chapter: [0.13] Biodiversity and Its Conservation
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Given below is the stepwise schematic representation of the process of electrophoresis. Identify the 'alphabets' representing
- Anode end
- smallest/lightest DNA strand in the matrix
- Agarose gel
Chapter: [0.09] Biotechnology - Principles and Processes
What is elution?
Chapter: [0.09] Biotechnology - Principles and Processes
State the importance of elution in this process.
Chapter: [0.09] Biotechnology - Principles and Processes
Explain the property of contact inhibition and its effect on normal human cells and cancerous cells.
Chapter:
Why are biological modifiers like α-interferon required for cancer treatment?
Chapter:
How do biological modifiers like α-interferon act to treat the disease?
Chapter:
What are Cry proteins?
Chapter: [0.1] Biotechnology and Its Application
With the help of a suitable example, explain how cry-proteins acts as a biological pesticide.
Chapter: [0.1] Biotechnology and Its Application
Explain the concept of "co-extinction" by taking two examples.
Chapter: [0.13] Biodiversity and Its Conservation
"Forests provide intangible benefits to us." Explain by taking three different areas, how.
Chapter: [0.13] Biodiversity and Its Conservation
Read the paragraph given below and answer and questions that follow:
| Enzyme Taq polymerase, is extracted from a eubacterial microorganism Thermus aquaticus from Yellowstone National Park in Montana, USA and isolated by Chien et al. (1976). Taq polymerase successfully replaced the DNA polymerase from E.coli that was being used in PCR earlier and this shift revolutionised the PCR technique. |
- Taq polymerase after its discovery replaced E.coli DNA polymerase in PCR technique. Explain giving reasons why was the need felt for the change?
- What is a primer and its importance in PCR?
- Write the importance of PCR as a diagnostic tool.
Chapter: [0.09] Biotechnology - Principles and Processes
Read the following paragraph and answer the questions that follow:
| Biotechnology revolves around the "gene of interest", with an objective to open various avenues for human welfare in health, medicine, pharma, agriculture etc. using different techniques, tools and processes. One of the breakthroughs of biotechnology in medicine is the gene therapy. |
- Name the human disease for which the gene therapy was used for the first time.
- Explain the steps of gene therapy carried to cure the disease using the lymphocytes of the patient. Why is this therapy not a permanent cure of the disease?
- Write the possible permanent cure of the disease by the gene therapy that is in progress.
Chapter: [0.09] Biotechnology - Principles and Processes
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