Interval scale like a temperature scale in centigrade or fahrenheit units, a scale on which the intervals are equal but which has an arbitrary zero point; e.g., intelligence quotient values are values along an interval scale.
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell exterior. Although animal cells lack these cell structures, both of them have nucleus, mitochondria, endoplasmic reticulum, etc. Read this tutorial to learn plant cell structures and their roles in plants...
A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, and so on. The cellular contents are surrounded by a double layer, cell membrane. These cellular structures and cell junctions are elaborated in this tutorial...
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, and netting in determining biodiversity...