phytohormones are substances are plant hormones that influence plant growth and differentiation. Formerly referred to as plant hormones or phytohormones eg :-
1.Auxin
2.Gibberellin
3.Cytokinins
4.Abscissic Acid
Pure iron is soft and very malleable (elastic) and is able to stretch a lot and it is also ductile. It can rust (oxidize) readily in moist air. It is also fairly reactive. Pure iron has little use – some for analytical chemistry and some in medicine. It is made much more useful by alloying it with other materials. Due to these drawbacks iron is not used in pure state.
Yes, absolutely in both the cases there will be current induced, this is because the current induced is dependent upon the flux through the coil and in both the cases the flux is varying.
While in the first case the moving magnet causes the variation of the flux through the coil in the later case it is the moving coil that does it.
b. answer
The separation of oxygenated and de-oxygenated blood allows a more efficient supply of oxygen to the body cells. This efficient system of oxygen supply is very useful in warm-blooded animals such as human beings.
As we know, warm-blooded animals have to maintain a constant body temperature by cooling themselves when they are in a hotter environment and by warming their bodies when they are in a cooler environment. Hence, they require more O 2 for more respiration so that they can produce more energy to maintain their body temperature. Thus, the circulatory system of humans is more efficient because of the double circulatory heart.