Chapter 15 Flashcards
Physiology
The study of the life processes in an organism.
Nastic Movement
A plant’s response to a stimulus such that the direction of the response is preprogrammed and not dependent on the direction of the stimulus.
Pore Spaces
Spaces in the soil that determine how much water and air the soil can hold.
Loam
A mixture of gravel, sand, silt, clay, and organic matter.
Cohesion
The phenomenon that occurs when individual molecules are so strongly attached to each other that they tend to stay together, even when exposed to tension.
Hormones
Chemicals that circulate throughout multicellular organisms, regulating cellular processes by interacting with specifically targeted cells.
Phototropism
A growth response to light.
Gravitropism
A growth response to gravity.
Thigmotropism
A growth response to touch
Pollination
The transfer of pollen grains from another to the carpel in flowering plants.
Double Fertilization
A fertilization process that requires to sperm to fuse with the other two cells.
Seed
An ovule with a protective coating, encasing a mature plant embryo and a nutrient source.
Fruit
A mature embryo that contains a seed or seeds.
