P-2 Animal Classification — Science STD 10 — Question

How would you test for an alcohol?

What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner?

A doctor has prescribed a corrective lens of power, -1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

How has the traditional use of energy of flowing water been modified for our convenience?

An object is placed at 10 cm from a convex lens of focal length 12 m. Find the position and nature of the image.

When a person breathes in air, the air enters into his body through an organ Ahaving two holes B in it. The air then passes through pharynx and larynx and enters into a tube C. The tube C divides into two smaller tubes D at its lower end. The two smaller tubes are attached to two respiratory organs E. Each smaller tube divides inside the organs E to form a large number of still smaller tubes called F. The smallest tubes F have air-sacs G at their ends in which gaseous exchange takes place in the body of the person. What are A, B, C, D, E, F and G?

What is the role of chromosomes in cell division?

Which group of elements could be placed in Mendeleev’s periodic table later on, without disturbing the original order? Give reason.

What is a tuber? Name one stem tuber and one root tuber.