MCQ
Deep black soil is productive due to high proportion of:
- ASand and zinc.
- BGravel and calcium.
- CClay and humus.
- DSilt and earthworm.
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$I.$ The total organic matter synthesised by the producers in the process of photosynthesis per unit time and area is known as gross primary productivity
$II.$ Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume per unit time