Are plants that live on other plants parasites? Not really, right? Especially in the tropics, you can hardly find a tree on which there isn’t a growth of another kind of plant ranging from tiny mosses via larger ferns to proper seed-bearing species. However, such ‘epiphytes’ (as these species that are using a bigger individual as a support to grow on are called) may only weaken their host by being too numerous or by becoming too heavy. They can also affect their host by intercepting some rain water and shadowing some of the host plant’s leaves and/or by providing shelter to insects and other arthropods that can be foes as well as friends. However, as long as they do not sink their own roots into the host plant’s body, they are not removing anything from their host. And that’s different in species belonging to the genus Viscum, commonly known as the “mistletoe”. —>—>
A problem for plants
There can be no doubt that seedlings know that their roots have to grow down and their stems upward. This awareness of gravity seems to be maintained even in older plants, for if a young tree was lying flat on the ground (perhaps as a result of a storm), but with its roots still anchored in the soil, its tip would slowly bend upward in the months to come. Animals possess gravity receptors, statocysts, ear-stones; if they lack them they use their eyes and perceive the light from above, but plants? Where are their gravity sensors and where are their “eyes”? —>—>
Can we survive without bees, the chief pollinator?
The great Albert Einstein, although disputed by some, is often quoted to have famously stated that if there were no bees around any more, humans would have only 4 years to survive. Whether or not he actually had made such a statement, these days honey bees are very much in the news as reports of a decline in bee populations come in from various parts of the world. —>—>