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Peach, apricot, plum, pear, apple, cherry trees are plants of the same family, Rosaceae, so they are closely related. They share many more aspects than the five petals. In fact, other plants in this family, and even many other dicots have five petal, simply because their share a common ancestry.

Yes, plants of all sizes can have cancerous growths. Agrobacterium tumifaciens, the causative agent of crown gall disease, produces what is called a tumor. See this link for detailed information on these growths. Alternatively, use a plant physiology textbook to look up the above terms. (Here, is where a textbook is better than a single abstract in PubMed.) ...

As with the massive variety of compounds that serve to protect plants against insect and animals, resulting in a wide range of poisons, antibiotics and other natural insecticides, allelopathic compounds are highly varied with different methods of action: some merely prevent germination while others are effectively herbicides. One example is Alliolaria ...

A classic example is juglone from Black Walnut tree roots. This review from 1973 discusses juglone and allelopathy, inhibiting growth of other trees. This 1961 paper describes juglone's effects as able to sedate or at depress movement of Daphnia magna, leopard frogs, perch, catfish, goldfish, mice, rats and rabbits. That led to work testing juglone on cancer ...

First off, "evolution" doesn't necessarily lead the most efficient system for anything - it works with what we already have. Once something has evolved, it might not go away, if there is no particular harm to having it around. You might take a look at the evolution tag, as other people have asked similar questions about the "usefulness" of biological ...

The rate of photosynthesis varies from plant to plant. Some plants require more light and some require less. If you move light closer to the plant, in most scenarios the rate of photosynthesis is likely to be increased. For some plants a minimal light is enough for their photosynthesis, so for those plants, moving light source closer or further will have ...

The phenomenon you are asking about is allelopathy. Remarkably, it has its own journal - Allelopathy Journal (ISSN: 0971-4693) published since 2009 and currently at volume 30, issue 1. Here are the titles of the papers from the most recent issue: In-vitro assessment of allelopathic effects of wheat on potato. Allelopathic effects of sunflower on ...