During the origin and evolution of life, key biological compounds were progressively synthesized in ocean with the help of energy obtainable from

Options

A. Lightning
B. Ultraviolet light
C. Lightning as well as ultra-violet light
D. Combustion of certain compounds.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks about the key biological compounds that were synthesized in the ocean during the origin and evolution of life, specifically focusing on the sources of energy that facilitated this process.

2. **Historical Context**: In the 1920s, scientist Alexander Oparin proposed a hypothesis regarding the abiotic (non-living) formation of organic compounds. He suggested that the early Earth had a primitive atmosphere rich in hydrogen, methane, ammonia, nitrogen, and water vapor, but lacked free oxygen.

3. **Energy Sources**: To convert these inorganic gases into organic monomers (the building blocks of life), energy was required. Oparin identified several potential energy sources:
- **Lightning**: Natural electrical discharges that could provide the necessary energy for chemical reactions.
- **Ultraviolet (UV) Light**: Solar energy in the form of UV radiation that could drive chemical reactions in the atmosphere and oceans.
- **Volcanic Eruptions**: The heat and energy from volcanic activity could also contribute to the synthesis of organic compounds.

4. **Formation of Organic Compounds**: The energy from these sources allowed for the reactions between inorganic molecules, leading to the formation of organic monomers. This process is often referred to as the creation of a "primordial soup" or "prebiotic soup," a term coined by J.B.S. Haldane.

5. **Conclusion**: The synthesis of biological compounds in the ocean during the origin and evolution of life was facilitated by energy obtained from both lightning and ultraviolet light, along with contributions from volcanic activity.

**Final Answer**: The key biological compounds were progressively synthesized in the ocean with the help of energy obtainable from **lightning as well as ultraviolet light**.

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