Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks :-

1. A. A – Rock minerals, B – Detritus, C – Litter fall, D – Producers
2. B. A – Litter fall, B – Producers, C – Rock minerals, D – Detritus
3. C. A – Detritus, B – Rock minerals, C – Producers, D – Litter fall
4. D. A – Producers, B – Litter fall, C – Rock minerals, D – Detritus

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