MCQ
Ammonia $\left( NH _3^{+}\right)$is converted into nitrite $\left( NO _2^{-}\right)$by a bacterium called:
- ANitrobacter bacterium
- BRhizobium
- CAnabaena azollae
- ✓Nitrosomonas
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| A. Xylem | (i) Treachery elements |
| B. Secondary xylem | (ii) Water transport |
| C. Phloem | (iii) Sieve elements |
| D. Secondary phloem | (iv) Food transport |