Term - II 

Sample Tet Papers 

Test - I 

16 Marks

Sexual reproduction in flowering plants

Human Reproduction

Reproductive Health

20 Marks

Principles of Inheritance & Variation

Molecular Basis of Inheritance

Evolution

12

Human Health & Disease

Microbes in Human Welfare

12

Biotechnology - Principles and Processes

Biotechnology & Its applications

10 Marks

Organisms and Populations

Ecosystem

Biodiversity and its conservation

CHAPTER 8 HUMAN HEALTH AND DISEASE

1. What are the various public health measures, which you would suggest as safeguard against infectious diseases? 

2. In which way has the study of biology helped us to control infectious diseases? 

3. How does the transmission of each of the following diseases take place? (a) Amoebiasis (b) Malaria (c) Ascariasis (d) Pneumonia 

4. What measure would you take to prevent water-borne diseases? 

5. Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines. 

6. Name the primary and secondary lymphoid organs. 

7. The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (a) MALT (b) CMI (c) AIDS (d) NACO (e) HIV 

8. Differentiate the following and give examples of each: (a) Innate and acquired immunity (b) Active and passive immunity 

9. Draw a well-labelled diagram of an antibody molecule. 

10. What are the various routes by which transmission of human immunodeficiency virus takes place? 

11. What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person? 

12. How is a cancerous cell different from a normal cell? 

13. Explain what is meant by metastasis. 

14. List the harmful effects caused by alcohol/drug abuse. 

15. Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence? 

16. Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher. 

17. In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?

CHAPTER 10 MICROBES IN HUMAN WELFARE

1. Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes with the help of a microscope, which sample would you carry and why? 

2. Give examples to prove that microbes release gases during metabolism. 

3. In which food would you find lactic acid bacteria? Mention some of their useful applications. 

4. Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes. 

5. In which way have microbes played a major role in controlling diseases caused by harmful bacteria? 

6. Name any two species of fungus, which are used in the production of the antibiotics. 

7. What is sewage? In which way can sewage be harmful to us? 

8. What is the key difference between primary and secondary sewage treatment? 

9. Do you think microbes can also be used as source of energy? If yes, how? 

10. Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished. 

11. Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20mg/L, 8mg/L and 400mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

12. Find out the name of the microbes from which Cyclosporin A (an immunosuppressive drug) and Statins (blood cholesterol lowering agents) are obtained. 

13. Find out the role of microbes in the following and discuss it with your teacher. (a) Single cell protein (SCP) (b) Soil 14. Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer. Biogas, Citric acid, Penicillin and Curd 

15. How do biofertilisers enrich the fertility of the soil?

CHAPTER 11 BIOTECHNOLOGY : PRINCIPLES AND PROCESSES

1. Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet). 

2. Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces. 

3. From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know? 

4. What would be the molar concentration of human DNA in a human cell? Consult your teacher. 

5. Do eukaryotic cells have restriction endonucleases? Justify your answer. 

6. Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?

 7. Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following base-pair rules. 

8. Can you recall meiosis and indicate at what stage a recombinant DNA is made? 

9. Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?

CHAPTER 12 BIOTECHNOLOGY AND ITS APPLICATIONS

1. Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because – (a) bacteria are resistant to the toxin (b) toxin is immature; (c) toxin is inactive; (d) bacteria encloses toxin in a special sac. 

2. What are transgenic bacteria? Illustrate using any one example. 

3. Compare and contrast the advantages and disadvantages of production of genetically modified crops.

4. What are Cry proteins? Name an organism that produce it. How has man exploited this protein to his benefit? 

5. What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency. 

6. Digrammatically represent the experimental steps in cloning and expressing an human gene (say the gene for growth hormone) into a bacterium like E. coli ? 

7. Can you suggest a method to remove oil (hydrocarbon) from seeds based on your understanding of rDNA technology and chemistry of oil? 

8. Find out from internet what is golden rice. 

9. Does our blood have proteases and nucleases? 10. Consult internet and find out how to make orally active protein pharmaceutical. What is the major problem to be encountered?

CHAPTER 13 ORGANISMS AND POPULATIONS

1. How is diapause different from hibernation? 

2. If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not? 

3. Most living organisms cannot survive at temperature above 450C. How are some microbes able to live in habitats with temperatures exceeding 1000C? 

4. List the attributes that populations possess but not individuals. 

5. If a population growing exponentially double in size in 3 years, what is the intrinsic rate of increase (r) of the population? 

6. Name important defence mechanisms in plants against herbivory.

7. An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree? 

8. What is the ecological principle behind the biological control method of managing with pest insects? 

9. Distinguish between the following: (a) Hibernation and Aestivation (b) Ectotherms and Endotherms 

10. Write a short note on (a) Adaptations of desert plants and animals (b) Adaptations of plants to water scarcity (c) Behavioural adaptations in animals (d) Importance of light to plants (e) Effect of temperature or water scarcity and the adaptations of animals. 11. List the various abiotic environmental factors. 

12. Give an example for: (a) An endothermic animal (b) An ectothermic animal (c) An organism of benthic zone 

13. Define population and community. 

14. Define the following terms and give one example for each: (a) Commensalism (b) Parasitism (c) Camouflage (d) Mutualism (e) Interspecific competition 

15. With the help of suitable diagram describe the logistic population growth curve. 

16. Select the statement which explains best parasitism. (a) One organism is benefited. (b) Both the organisms are benefited. (c) One organism is benefited, other is not affected. (d) One organism is benefited, other is affected. 

17. List any three important characteristics of a population and explain.

CHAPTER 15 BIODIVERSITY AND CONSERVATION

1. Name the three important components of biodiversity. 

2. How do ecologists estimate the total number of species present in the world

3. Give three hypotheses for explaining why tropics show greatest levels of species richness. 

4. What is the significance of the slope of regression in a species – area relationship? 

5. What are the major causes of species losses in a geographical region? 

6. How is biodiversity important for ecosystem functioning? 

7. What are sacred groves? What is their role in conservation? 

8. Among the ecosystem services are control of floods and soil erosion. How is this achieved by the biotic components of the ecosystem? 

9. The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification? 

10. Can you think of a situation where we deliberately want to make a species extinct? How would you justify it