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...
Several fungi and bacterial wilts have the potential to cause tomato plants to wilt. Examples of fungi that can cause wilt diseases to occur are Verticillium and Fusarium. There is also a bacterial wilt disease that can cause tomato plants to wilt. Tomato wilt diseases have similar symptoms. When wilt is present, the tomato plant will often start to wilt during the hottest part of the day.