visible reproductive structures are observed in sub kingdom
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Answer
Gymnosperm means naked seed. These plants do not have flowers. And so, the seeds are not enclosed inside any specialized structure like the ovary seen in the other group of plants i.e. angiosperms. Rather, the seeds develop on the surface of the reproductive structures of the plants. Thus are visible as cones on maturity. Sometimes we can find the seeds on small stalks too.
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Answer:
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. In redox reaction the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.
In the reaction : CuO+H 2
⟶Cu+H 2O
in the reaction H 2
is oxidized since it has lost electrons and Cu is reduced since it has gained electrons.