Biology · Evolution · NEET
No. These are two different theories and NEET may mix them up. Panspermia says life came from OUTER SPACE as spores. Spontaneous generation says life came from NON-LIVING decaying matter like mud and straw on Earth itself. Panspermia is also called the cosmozoic theory.
No, and this is the main flaw. Panspermia only shifts the question to another planet. It says life came from space, but it does not explain how that life first formed anywhere. So it does not truly answer the origin of life. NCERT calls it only a 'favourite idea for some astronomers', not a proven theory.
Here 'spores' means small resistant units of life. Early Greek thinkers believed these units of life were carried from one planet to another, including Earth. Do not confuse these with fungal or bacterial spores in your syllabus; the word is used loosely for tiny living seeds of life travelling through space.
NCERT says early Greek thinkers first thought that units of life called spores were transferred between planets. The idea is still supported by some astronomers today. NCERT does not link one single named scientist to it, so for NEET remember 'early Greek thinkers' and 'some astronomers'.
No. The accepted scientific view in NCERT is chemical evolution (the Oparin-Haldane theory, supported by the Miller-Urey experiment). Panspermia is mentioned only as an older alternative idea and is not the accepted mechanism for the origin of life.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
It is the idea that life did not start on Earth but came from outer space. Tiny units of life called spores travelled through space and landed on Earth.
It is also called the cosmozoic theory, because it suggests life (zoa) came from the cosmos (space).
Because it does not explain how life first formed. It only says life came from another planet, so the real question of origin stays unanswered.
The theory of chemical evolution (Oparin and Haldane), tested by the Miller-Urey experiment, is the accepted scientific explanation for the origin of life.
Yes, as a one-line concept. NEET can ask about the sequence of origin-of-life theories, so know that panspermia = life from space via spores, proposed by early Greek thinkers.
