Answer: Struggle for Existence. Intra-specific struggle: It is the competition among the individuals of the same species. This type of struggle is very severe, because the need and approach of all competing organisms is precisely same. e.g. struggle between cow and cow, […]
Category: Biology II Question and Answer – HSC Board of Maharashtra
Describe Darwin’s theory of natural selection. State the objections raised against this theory.
Answer: Darwin’s theory of natural selection. Charles R. Darwin was a British biologist. He postulated the “Theory of origin of species by natural selection”. Principles of Darwinism: Darwin’s theory of organic evolution by natural selection is based on the following principles: i. […]
Give an account of Urey and Miller’s experiment.
Answer : Urey & Miller’s experiment i. Stanley Miller and Urey designed an apparatus and created conditions similar to primitive atmosphere. ii. The apparatus had a spark chamber with two tungsten electrodes, flask for boiling water, side tube connected to a […]
Describe Oparin — Haldane theory of chemical origin of life.
Answer: Oparin — Haldane theory of chemical origin of life. The Russian scientist Alexander Ivanovich Oparin (1924) and British scientist J.B.S. Haldane (1929) proposed the ‘Theory of chemical evolution of life’. According to this theory, life originated from non-living matter, some three billion […]