Spontaneous Generation (Abiogenesis)
- believed that living things may arise from nonliving substances.
Aristotle
- noted in his book Historia Animalium: mullet, a kind of fish, is the mud
of a dried-up pond that came to life spontaneously when rain filled the pond.
John Turberville Needham
- English biologist
- boiled mutton gravy, poured into a glass vial, and corked it. After a afew days,
the gravy was swarming with microorganisms.
F.A. Pouchet
- respected French scientist
- prepared hay infusion and introduced "artificial air". In a few days, the infusion
contained a rich variety of microorganisms.
THEORY OF BIOGENESIS
Biogenesis
- states that life comes only from life
Francesco Redi
- Italian physician
- proved that maggots were not spontaneously generated from rotting meat.
Lazzaro Spallanzani
- Italian biologist
- repeated Neddham's experiment but failed to obtain growth of organisms
by spontaneous generation
- he used vessels that are tightly closed.
Louis Pasteur
- one of the graetest biologist of all time from France.
- made an experiment which proved that air was a source of contamination.
- used flasks for his experiments.
Stanley Miller
- proved in his laboratory the possibility of forming amino acids and other organic
molecules from a mixture of hydrogen, methane , and ammonia.
Characteristics of Living Things
- Living things have a specific organization
- Living things undergo metabolic processes in their bodies
- Living things can move
- Living things can react to stimuli or changes in their surroundings
- Living things are capable of growth
- Living things can reproduce
- Living things can adapt to their environment
No comments:
Post a Comment