Hypothalamus
The ventral part of the vertebrate forebrain; functions in maintaining homeostasis,
especially in coordinating the endocrine and nervous systems; secretes hormones of the
posterior pituitary and releasing factors, which regulate the anterior pituitary.
Hypothesis
A temporary working explanation or supposition based on accumulated facts and suggesting
some general principle or relation of cause and effect; a postulated solution to a scientific
problem that must be tested and if not validated, discarded.
Hypotonic solution
A solution with a lesser solute concentration than another, a hypertonic solution
Hypostomata
Having stomata (mostly) on the underneath
I
Ichthyologist
Biologists who specialize in the study of fish behavior, anatomy, physiology, and evolution.
Ileum
The terminal portion of the small intestine extending from the jejunum to the cecum
Intracellular.
Occurring or situated within a cell or cells: intracellular fluid.
Intra-fascicular cambium
The cambium arising between the vascular bundles in the stem of a plant
Inner endodermis
The innermost layer of the cortex that forms a sheath around the vascular tissue of roots
and some stems.
Imaginal disk
An island of undifferentiated cells in an insect larva, which are committed (determined) to
form a particular organ during metamorphosis to the adult.