Our Environment — Science STD 10 — Question

Draw a circuit diagram to show how two 4V electric lamps can be lit brightly from two 2V cells.

Give the functions of medulla.

Give two differences between food chain and food web.

What is the role of seminal vesicles and prostrate gland in human male reproductive system?

Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.

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?

Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements.

Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles.