Q. What are the disadvantages of synthetic fibers?

Q. (a) Name any two copper releasing IUDs.(b) Explain how they act as effective contraceptives in human females.

Q. Write a letter to your cousin, Raj Prakash who is currently staying in Dubai explaining the process of CCE, being used by CBSE for the secondary school examination in its affiliated schools. Also, mention how you and your classmates have reacted to this scheme. You are Narain/Nisha, 20 Fort Road, Mumbai.

Q. What is an olfactory indicator? Name two such indicators.

Q. Explain: “As for my grandmother being young and pretty, the thought was almost revolting”.

Q. What is the arrear amount in the electricity bill?

Q. Name the primary and secondary lymphoid organs.

Q. Name an acid which is present in baking powder.

Q. Name any two simple and two complex permanent tissues in plants.

Q. What is the molar mass of potassium permanganate?