MCQ
Deep black soil is productive due to high proportion of:
- ASand and zinc.
- BGravel and calcium.
- ✓Clay and humus.
- DSilt and earthworm.
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$a$ - Sacred grooves are part of in situ-conservation
$b$ - Zoological parks are approach for in situ-conservation
$c$ - In this approach ecologically unique and biodiversity rich regions are legally protected.