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Igneous Rock: A certain type of rock that forms when molten rock, in the form of lava or magma, cools and hardens.

Immunoglobulin: A protein that is produced by plasma cells and lymphocytes. These proteins attach themselves to infectious substances, such as bacteria, and are used to help destroy them.

Indehiscent: A term that refers to a method of seed dispersal other than bursting fruit. Examples include fruits and fruiting bodies that decay, seeds dispersed by wind or water, or dispersed by animals. Contrast with dehiscent.

Inflorescence: The arrangement that flowers are born on a plant.

Inosine: A purine ribonucleosine that can be derived from AMP and GMP.

Insoluble: A substance that cannot be dissolved in another substance.

Invertebrate: Any animal without a backbone. Examples include insects, and jellyfish.

Ion: An electrically charged atom or molecule, which gained a charge by losing an electron.

Isotope: In chemistry, the various forms of a single element, which vary by their number of neutrons.