Types of flowers

Hypogynous flower- The ovary in such flowers is said to be superior,  e.g., mustard, china rose and brinjal.

Perigynous flower- The ovary here is said to be half inferior. e.g., plum, rose, peach. (Rosaceae)

Epigynous flowers, the ovary is said to be inferior. e.g., guava and cucumber, and the ray florets of sunflower.

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Anammox is anaerobic production of molecular nitrogen from NH4 +and NO2–

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N2 constitutes about 80% of the earth’s atmosphere, but the stability of its triple bond renders it inert and metabolically inaccessible to most organisms.

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Diazotrophs are able to catalyze the enzymatic reduction of this compound to ammonia (NH3) using the enzyme nitrogenase

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Nitrogenase is a complex consisting of the MoFe protein (dinitrogenase or component I) a heterotetramer, and the Fe protein (dinitrogenase reductase or component II) a homodimer.

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Fe protein 

contains 2 identical subunits (dimer) – nif H

Each subunit has MW of 30 ~ 72 kD.

Each subunit contains an Fe-S cluster (4Fe and 4S2-).