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XII BOARDS PREVIOUS YEAR-XII BOARDS-SECTION-B
- In a pond there were 20 Hydrilla plants. Through reproduction 10 new H...
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- Biodiversity must be conserved as it plays an important role in many e...
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- How many haploid cells are present in matue female gametophyte of a fl...
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- When a tall pea plant was selfed, it produced one-fourth of its progen...
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- Chlorofluorocarbons (CFCs) are widely used as refrigerants. Then why i...
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- In a pond there were 200 frogs, 40 more were born in a year. Calculate...
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- Where does triple fusion take place in a flowering plant? Why is it so...
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- Why certain regions have been declared as biodiversity "hot spots" by ...
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- How does an electrostatic precipitator work to remove particulate poll...
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- Study the given aquatic food chain and answer the questions that follo...
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- Why are F(2) phenotypic and genotypic ratios same in a cross between r...
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- Geitonogamous flowering plants are genetically autogamous but function...
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- When and where do chorionic villi appear in humans ? State their funct...
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- In a cross between two tall pea plants some of the offsprings produced...
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- A student on a school trip started sneezing and wheezing soon after r...
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- Name two commonly used bioreactors. State the importance of using a bi...
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- (a) How does cleistogamy ensure autogamy? (b) State one advantage an...
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- A mature, embryo-sac in a flowering plant may possess 7-cells, but 8-n...
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- Describe the structure of a nucleosome.
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- Mention the evolutionary significance of the following organisms : (...
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