1
Question
Evolution of life shows that life forms had a trend of moving from:
Evolution of life shows that life forms had a trend of moving from:
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Solution
The correct option is B water to land
Origin of life:
Primitive earth had large amounts of hydrogen, oxygen, carbon, nitrogen, sulphur, phosphorus etc. These atoms combined to form simple molecules H2,N2,H2O,CH4,CO2,NH3. The environment was reducing in nature. Simple molecules reacted to form simple organic molecules like:
● Simple sugars (ribose, deoxyribose, glucose)
● Nitrogen bases (purines, pyrimidines)
● Amino Acids, glycerol, fatty acids
Torrential rain dissolved and carried these molecules into the oceans. A soup-like broth of chemicals was formed in the oceans. Life is believed to have originated from this.
Evidence for the origin of life in water:
Fossil records show that fossils were not in abundance in the beginning as they were in later stages. The rocks of the early era (e.g., Proterozoic) contain less number of fossils than the rocks of later era and only fossils of simple marine invertebrates are in these rocks.
It is due to the fact that life first originated in the sea as a simple form.
Final answer
d. water to land
Origin of life:
Primitive earth had large amounts of hydrogen, oxygen, carbon, nitrogen, sulphur, phosphorus etc. These atoms combined to form simple molecules H2,N2,H2O,CH4,CO2,NH3. The environment was reducing in nature. Simple molecules reacted to form simple organic molecules like:
● Simple sugars (ribose, deoxyribose, glucose)
● Nitrogen bases (purines, pyrimidines)
● Amino Acids, glycerol, fatty acids
Torrential rain dissolved and carried these molecules into the oceans. A soup-like broth of chemicals was formed in the oceans. Life is believed to have originated from this.
Evidence for the origin of life in water:
Fossil records show that fossils were not in abundance in the beginning as they were in later stages. The rocks of the early era (e.g., Proterozoic) contain less number of fossils than the rocks of later era and only fossils of simple marine invertebrates are in these rocks.
It is due to the fact that life first originated in the sea as a simple form.
Final answer
d. water to land
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