Question

1. In an angiosperm,anther with malfunctining tapetum often fail to produce viable pollens comment. 2. Suggest an animal breeding method that can increase herd siz within short duration. 3. Sumita used cellulose enzyme to isolate genetic material from a fungus cell but she failed to do so. Predict the reason for her failure. or Name the thermostanle DNA Polymerase employed in PCR. 4. Name thr technique used for silencing of specific mRNA to prevent parasitic infestation in tobacco plants. 5. State two advantages offered by EcoSan toilats in conserving enviroment. or Mention two limitation of ecological pyramids. 6. "Gamete formation may involve different type of cell division in different organisms". Justify statement. 7. Write any four features of the genttic disorder caused by trisomy of 21th chromosome. 8. Name the group of organism and substrate used in biogas plant to produce biogas. or Name a fungus and its product that is very essential to organ transplant in pantients. 9. Explain why it is fermed that every cistron is a gene but every geneis not a cictron. 10. What is the importance of treating bacterial cell with divalent cation during r-DNA transformation? or Sumit forgot to put ethidium bromide during gel electrophresis. What would be the possible consequences? 11. Explain with the help of two examples, how the invasion of alian species have distrbed the native species of an ecosystem. 12. Differentiate between normal and cancerous cell. 13. Enumerate any five adaptive floral charistics od a wind pollinated flower. Give one Example of such flower. or Both Vallisneria and water lily are aquatic plant but they are pollinated by diffetent agents. Describe the pollination of both. 14. A. Name the organ where gametogenesis is completed in human male and female respectively. B. Draw and lable the diagram of human ovum. 15. in Snamdragon, a cross between two pink flowered plants produces offsprings that bear white flowers, red flowers and pink flowers. Work out a cross to explain how is it possible? or 16. Draw a sketch of tRNA containing amino acid is respect of AUG codon of mRNA and lable it. 17. A. Explain with the help of two example how anthropogenic actions have caused evolution of species? B. Write the name of a 15 mya primate that was man like. 18. Draw a flow chart showing the part of life cycle of malarial parasite in human host. or Name the kind of immunity attained through vaccination. Explain it in brief. 19. what is inbreeding depression? Mention two ways to overcome in breeding depression in animal husbandary. 20. A. Name a symbiotic bacteria that act as biofertiliser. How does it act as biofertilisers? B. Mention two advantages offered by biofertilisers to the enviroment. 21. Few strands of hain have been collected from crime scene. Alarge number of copies of gene if interest are need for futher investigation through DNA fingerprinting. Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro from these strands of hains. 22. Describe three potential applications of genetically modified organisms. or "Biotechnology has played an important role in integrated pest management by proceedind insect resistence crops". Support the statement by giving suitable example. Also discuss how such crop has been developed. 23. Show graphically, the population groth pattern when the resources are limited. Write the equation for such growth pattern. 24. Mention the pineer and climax community of xerach succession. Which succession is faster primary or secondary and why? 25. A. Why the number of oocyte is fixed in ovary of human female. B. Differentiate between ZIFT and GIFT. C. Outbreeding devices in plants ensure cross pollination. Discuss. 26. Describe the human evolution in light of fossil record found in different parts of the world. or Discuss the sequence of events leading to breakdown of lactose in E.coli when E.coli in medium containing lactose 27. A. Write three reason to explain why there is a greater biodiversity in tropical region of the earth. B. Explain any two argument that are put forward in support of biodiversity conversation. or A. By the end of 2002, Delhi's public transport was switched over to CNG. Write three advantages of using CNG as fuel. B. Explain how the biomagnification of DDT has affected the bird population?

Answer 1

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The life cycle of a plant starts as a seed. The seed germinates and grows like a plant. The plant produces flowers which produce seed in fruit on fertilization. The plant dies and leaves seeds behind which germinate to form a new plant.