MCQ
The dominant second trophic level, in a lake ecosystem, is
- ABenthos
- BPlankton
- ✓Zooplankton
- DPhytoplankton
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$I.$ Cytokinin - Delay of leaf senescence
$II.$ Auxin - Apical dominance
$III.$ Ethylene - Seed germination
$IV.$ Gibberellins - Immature falling of leaves