Q. 1. Why is dna copying essential for reproduction?
Q. 2. What is the role of a catalyst in a chemical reaction?
Q. 3. Which class of compounds gives a positibve fehling’s test? Ans:aldehydes
Q. 4. What is meant by 1 volt?
Q. 5. Write the chemical name and formula for bleaching powder?
Q. 6. What is meant by dehydrating agent?
Q. 7. State ohm’s law.draw a schematic diagram of the circuit for studying ohm’s law?
Q. 8. State one limitation for the usage of solar energy?
Q. 9. What is a gene and where is it located?
Q. 10. Explain double fertilization in plants?
Q. 11. What is meant by magnetic field?
Q. 12. Why chlorophyll green in colour?
Q. 13. Give two methods to prevent rusting?
Q. 14. State the functions of gastric glands? 15.explain why stars twinkle?
