Ferredoxin is an iron-sulfur protein that effects electron transfer in a large number of redox reactions in cell metabolism through Fe-S clusters whose iron cations oscillate between +2 (ferrous) oxidation states. and +3 (ferric).
A particular chloroplast3 ferredoxin is involved in the cyclic and noncyclic photophosphorylation reactions of photosynthesis. In non-cyclic photophosphorylation, ferredoxin is the ultimate electron acceptor and reduces NADP + under the action of ferredoxin-NADP + reductase with FAD and a flavin group as cofactors.
When energy flows in a food chain, it is observed that the amount of energy flow decreases with successive trophic levels.
It is generally observed that approximately 90% of the energy available at a trophic level is used up and only remaining 10 % is transferred to the next .
This is termed as<em> </em><em>ten percent law.</em>
Thus, we can say that 90% of energy is lost when the energy is transferred from one trophic level to another.
The seeds perform the following functions: They help in germination of the new plant. The seeds contain food reservoirs in the form of cotyledons and endosperm. The seed coat is protective in nature which protects the embryo inside.
