Question

1. Describe Oparin -Haldane theory of
chemical origin of life.​

Answer 1

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Chemical evolution is the sequence of chemical changes in originally nonliving matter that give rise to life. The phrase “chemical evolution” is also used, in astronomy and cosmology, to describe the changing makeup of the Universe’s stock of chemical elements through deep time since the Big Bang, from hydrogen and helium immediately after the Big Bang to the full array of elements observed today. This article will restrict itself to the first meaning.

The first known living things on Earth were prokaryotes, a type of cell similar to present-day bacteria. Prokaryote fossils have been found in 3.4-million-year-old rock in the southern part of Africa, and in even older rocks in Australia, including some that appear to be photosynthetic. All forms of life are theorized to have evolved from the original prokaryotes, probably 3.5-4.0 billion years ago.