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MODEL PAPER - 1 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 1 [2026]1 Mark
MCQ
Flow of energy in an ecosystem is always :
  • A
    No specific direction
  • B
    Multidirectional
  • C
    Bidirectional
  • ✓
    Unidirectional
✓

Answer

Correct option: D.
Unidirectional
(D) Unidirectional
Explanation: The flow of energy in an ecosystem is always unidirectional. As the energy moves progressively through one trophic level to another, it is no longer available to the previous level. The energy that is captured by the autotrophs (producers) does not revert back to solar radiation. The energy which passes on to the herbivores (primary consumers) from the autotrophs does not come back to the autotrophs.

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