Honeybee communication Hormone Substance secreted by cells in one part of the body which, after being transported by body fluids, exerts an effect on the activities of cells elsewhere in the body. Humus Organic matter in the soil. Hybrid Organism produced by genetically dissimilar parents. Hydrocarbon A compound containing only carbon and hydrogen. Characteristic of petroleum and coal.
Food is digested by hydrolysis.
Hydronium ion Hydrophilic Used to describe molecules or molecular groups that are attracted to water and other polar solvents. Hydrophobic Used to describe molecules or molecular groups that mix poorly with water. Hydrocarbons and fats are hydrophobic. That portion of the shoot of a plant embryo or seedling below the node to which the cotyledons are attached.