The offspring formed as a result of sexual reproduction exhibits more variations because :

In human males, the testes lie in the scrotal sacs outside the body because it helps in the :

Characterstics that are transmitted from parents to offsprings during sexual reproduction show :

Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organisms Y is a tiny animal having tentacles which live in water.

(a) What is organisms X?

(b) Name the process in which X converts sugar into alcohol.

(c) To which class of organism does X belong?

(d) What are organisms Y?

(e) Out of X and Y, which organism is multicellular and which one is unicellular?

A unicellular organism P lives in pond water. The organisms P has no fixed shape, its shape keeps on changing. It moves and catches its prey with the help of organs Q which keep on appearing and disappearing. The organisms P reproduces by a process R. Another organisms S also reproduces by this process. Name P, Q, R and S.