Question

One of the possible early sources of energy was/were

• A. $CO_{2}$
• B. chlorophyll
• C. green plants
• D. $UV$ rays and lightning

Answer 1

Answer: (D)

$UV$ rays and lightning

Answer 2

The energy requiring synthetic processes, that occurred on primitive earth obtained energy from the sun, violent electric discharges like lightning, heat produced from volcanic eruptions and ionizing radiations like $X$-rays, etc