| TERM | GROUP | DEFINITION | |
|---|---|---|---|
| IMPERFECT | ADJ | PLANTS | Pronunciation: Etymology: A flower with EITHER male OR female functional reproductive structures. |
| INCOMPLETE | ADJ | PLANTS | Pronunciation: Etymology: Flower missing one or more of the four basic floral parts. |
| INDETERMINATE | ADJ | PLANTS | Pronunciation: Etymology: Having the capacity for continuous growth at the apex. |
| INFLORESCENCE | N | PLANTS | Pronunciation: Etymology: Having the capacity for continuous growth at the apex. |
| INFUSIFORM LARVA (INFUSIFORM LARVAE) | NP | ANIMALS | Pronunciation: Etymology: Infusiform larvae develop from axoblasts of sexual vermiform adults. These axoblasts form infusorigens, multicellular larvae with an inner mass of sperm surrounded by eggs. The zygotes thus produced develop into ciliated infusiform larvae. The infusiform is the dispersive stage. It leaves the kidney with the urine. How the cycle is completed and they return to another adult cephalopod is a mystery. |
| INOPERCULATE | ADJ | FUNGI | Pronunciation: Etymology: Lacking an operculum (lid-like structure covering ascus). |
| INTEGUMENT | N | ANIMALS, PLANTS, FUNGI | Pronunciation: Etymology: The outer covering of an ovule, which becomes the testa of the seed. |
| INTERCALARY MERISTEM | NP | PLANTS, PROTISTS | Pronunciation: Etymology: A meristemic region located between two partly differentiated tissue regions. |
| INTRANUCLEAR SPINDLE | NP | PROTISTS | Pronunciation: Etymology: An intranuclear spindle elaborates within the nuclear membrane of an organism with closed mitosis. |
| INTROVERT | N | ANIMALS | Click here |
| INVOLUCRE | N | PLANTS | Pronunciation: Etymology: A ring of bracts surrounding the head of flowers in the compositae family or subtending the umbel in the umbelliferae family. |
| ISIDIUM (ISIDEA) | N | FUNGI | Pronunciation: Etymology: Coral-like soredia on surface of some lichens. |
| ISOGAMETE | N | PLANTS, PROTISTS, FUNGI | Pronunciation: Etymology: Isogametes are gametes that are equal in size. |
| ISOGAMOUS | ADJ | PLANTS, PROTISTS, FUNGI | Pronunciation: Etymology: Isogamous (adj) describes sexual reproduction in which the gametes are structurally identical. |
| ISOKONT | ADJ OR N | PLANTS, PROTISTS | Pronunciation: Etymology: Isokont flagella are those flagella that are equal in length, form, and direction. |
| ISOLATING MECHANISM | NP | EVOLUTION | Click here |
| ISOMORPHIC ALTERNATION OF GENERATION | NP | PLANTS, PROTISTS, FUNGI | Pronunciation: Etymology: Isomorphic alternation of generation occurs in organisms in which the haploid gametophyte phase and diploid sporophyte phase are indistinguishable in form. |
