hamburger menu
All Coursesall course arrow
adda247
reward-icon
adda247
    arrow
    arrow
    arrow
    All ecosystems begin with energy input from-
    Question

    All ecosystems begin with energy input from-

    A.

    Water

    B.

    Firewood

    C.

    Air

    D.

    Sun

    Correct option is D

    The energy input for all ecosystems originates from the Sun. Solar energy drives photosynthesis in plants, which is the foundational process that supports all life in an ecosystem. Through photosynthesis, plants convert sunlight into chemical energy stored in glucose, which is then passed through the food chain as different organisms consume plants and each other. Thus, the Sun is the primary source of energy for nearly all ecosystems on Earth.

    test-prime-package

    Access ‘RRB JE Mechanical Engineering’ Mock Tests with

    • 60000+ Mocks and Previous Year Papers
    • Unlimited Re-Attempts
    • Personalised Report Card
    • 500% Refund on Final Selection
    • Largest Community
    students-icon
    354k+ students have already unlocked exclusive benefits with Test Prime!
    test-prime-package

    Access ‘RRB JE Mechanical Engineering’ Mock Tests with

    • 60000+ Mocks and Previous Year Papers
    • Unlimited Re-Attempts
    • Personalised Report Card
    • 500% Refund on Final Selection
    • Largest Community
    students-icon
    354k+ students have already unlocked exclusive benefits with Test Prime!
    Our Plans
    Monthsup-arrow