For species with bicellular pollen, the attrition of pollen tubes is often greatest where the style narrows at the transition between stigmatic tissue and the transmitting tissue of the style. In this ...

All living organisms need energy to perform various life processes and the source of energy for all living organisms is food. It is available from different sources. There are two types of modes of ...

ALL plankton surveys record the catches of diatoms and often of peridinians, but as a rule little mention is made of the autotrophic flagellates, though it appears quite possible that they make up the ...