181 results found

Search Results for: surface water

Surface water

Definition noun (ecology) Water that is above the substrate or soil surface such as streams, bays, lakes, rivers, seas,... Read More

Water

Water Definition (1) (biochemistry) A chemical substance, with chemical formula H2O, that is a clear, colorless, odorless,... Read More

Running Water Freshwater Communities

Running water freshwater communities are also known as lotic communities, lotic meaning running water. Lotic communities are... Read More

Cohesion

Cohesion Definition What is cohesion? Cohesion, in science definition, refers to the state of cohering or sticking together... Read More

Hydrophobic

Hydrophobic Definition The fear of mixing or reacting with water under a given set of reaction parameters is often referred... Read More

Hydrophilic

Hydrophilic Definition What does a hydrophile (or hydrophilic molecule) mean? If a molecule is “water-loving”, it is... Read More

Turgor pressure

In biology, turgor pressure pertains to the pressure that is exerted by the fluid (e.g. water) against the cell wall. It is... Read More

Plant Water Regulation

A plant requires water as an essential ingredient of photolysis, the photochemical stage of photosynthesis where water is... Read More

Xylem

Xylem Definition Xylem is defined as a plant tissue that transfers water and nutrients from roots to all over the plant... Read More

Soils

Where a plant grows and what resources are available to it is of vital importance to the life of a plant. The soil type and... Read More

Macrophytes

Introduction    Examples of Macrophytes. (Source: Canada's AquaticEnvironments) ... Read More

Freshwater Communities & Lentic Waters

Lentic (still water) communities can vary greatly in appearance, anything from a small temporary puddle to a large lake is... Read More

The Water Cycle

The water cycle (sometimes referred to as the hydrological cycle) is the continuous transfer of water from air, sea land and... Read More

Animal Water Regulation

Homeostatic control, a set environment, and how evolution and natural selection drives a species to adapt to its environment... Read More

Environment

Environment Definition What does environment mean? If you mean physical environment, then it is defined as the surrounding... Read More

Plant Metabolism

Introduction Plants are responsible for incredible feats of molecular transformation. The processes are always being... Read More

Chemical Composition of the Body

In order to fully understand the mechanisms of human physiology, it is important to have an understanding of the chemical... Read More

Epidermis

Epidermis Definition What is the epidermis? We can define the epidermis as one or more layers of cells forming the tough... Read More

Abiotic Factors – Water Conditions

Evidently, the light and heat from the sun play an important role in providing suitable conditions. However, the water... Read More

Roots

Upon seed germination, the embryo root, called the radicle, grows and develops into the first root. The radicle may thicken... Read More

Tissue

Tissue Definition What is tissue in the body? The body tissue is an aggregation of cells that function together and have a... Read More

Abiotic factor

There are several factors that shape the environment. This article is focused on what abiotic factor is and how it... Read More

Still Water Animals

Through millions of years of evolution, animals living in an aquatic environment have diversified to occupy the ecological... Read More

Kidneys and Regulation of Water and Inorganic Ions

Renal Functions Kidneys remove/add substances from/to the plasma. Regulate water concentration, inorganic ion... Read More

Leaves

Leaves are highly efficient solar energy converters. They capture light energy and through the process of photosynthesis.... Read More

Protist

Protist Definition What is a protist? All protists are eukaryotes, i.e. organisms with a nucleus. However, they are... Read More

Flaccid

Flaccid Definition Biology – What is Flaccid? In botany, the term flaccid refers to a cell that lacks turgidity, i.e. it... Read More

Movement of Molecules Across Cell Membranes

Diffusion Diffusion is essentially the movement of molecules from a region of higher concentration to a region of lower... Read More

System

A system pertains to interdependent or interrelated objects comprising and functioning as a whole. In biology, it may refer... Read More

Still Freshwater & Plants

Plants in the freshwater community provide a means of food for herbivores and harness new energy into the community as a... Read More

Plasma membrane

Do all cells have a plasma (or cell) membrane? Yes, all cells have a biological membrane that separates the protoplasm from... Read More

Filtration

Filtration Definition What is filtration? Filtration is separating a solid from a fluid through a porous material that... Read More

Digestion and Absorption of Food

The gastrointestinal (GI) system includes the gastrointestinal tract (mouth, pharynx, esophagus, stomach, small intestine,... Read More

Stems

External Form of a Woody Twig A woody twig, or stem, is an axis with leaves attached. The leaves are arranged in various... Read More

Tree

“The biological diversity is plenty if you look around yourself a little closely; with an eye for life!” … People... Read More

Arthropod

Arthropod Definition What is an arthropod? An arthropod is an invertebrate living organism characterized by the presence of... Read More

Pollution in Freshwater Ecosystems

As with all ecosystems, the existence and operations of human society inevitably have an effect on the way of life in a... Read More

Hydrogen

Hydrogen is one of the chemical elements found in nature. A chemical element refers to the pure substance of one type of... Read More

Phospholipid

What is a phospholipid? Phospholipids are a subgroup of lipids. Other major types of lipids are fatty acids, sphingolipids,... Read More

Cell membrane

Cell Membrane Definition Just like any non-living body possesses a plastic or paper packaging material that keeps the... Read More