plankton. n. 1. (Biology) the organisms inhabiting the surface layer of a sea or lake, consisting of small drifting plants and animals, such as diatoms.Compare nekton. [C19: via German from Greek planktos wandering, from plazesthai to roam].lankton is a primary food source for many animals, and consists of bacteria, protozoans, certain algae, cnidarians, tiny crustaceans such as copepods, and many other organisms. Microscopic aquatic organisms that float near the surface of water.
Descriptions of Common Tomato Diseases. 1  Anthracnose - small, circular, slightly sunken spots... 2  Bacterial Canker - wilting, browning plants and bird's-eye fruit spots. 3  Bacterial Spot - small, dark, slightly raised dots on fruit... 4  Bacteria Wilt - entire plant dies rapidly after browning... 5  Blossom End Rot - spot on bottom of fruit turns black and...
Solanum lycopersicum. The tomato plant is unusual in that it has at least three scientific names. Solanum lycopersicum is the most common, and it places the tomato (correctly) in the nightshade family (Solanaceae), along with tobacco, the potato, the eggplant and belladonna (deadly nightshade).omatoes are New World plants. They were unknown to Europeans before Columbus brought them back at the end of the 15th century. They had a variety of American Indian names and it is one of these Indian names that gives us the English word tomato..