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Vadim26 [7]
3 years ago
9

The two nutrients that typically limit primary productivity of ecosystems are phosphorus and __________. A. calcium B. carbon C.

nitrogen D. sodium
Biology
1 answer:
Mrrafil [7]3 years ago
5 0
The answer is C. nitrogen.

Plants are main producers in ecosystems so, primary productivity of ecosystems depends on them. Carbon is necessary for plants, but it is widely present in plants. On the other hand, calcium and sodium are not as essential. However, nitrogen is important for plants because it is necessary to make proteins. Proteins take part in many different processes such as photosynthesis (this is actually primary productivity). But, nitrogen is not available to plants, they cannot absorb it simply from the air but rely on some symbiotic bacteria which are able to.
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Humus is soil consisting of dead and decaying organic matter. It is mainly organic in content but some inorganic particles may be mixed in it. The top soil in a tropical forest may be considered as humus.

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