Tropism

This is a picture of a sunflower. It is an example of an organism that exhibits tropism. Tropism is when an organism turns or grows in a specific direction because of an external stimulus, such as light.  Most organisms that exhibit tropism are plants. There are many types of tropism, including chemotropism (in response to chemicals),  hydrotropism (in response to water), and phototropism (in response to light). The sunflower pictured exhibits phototropism, as it turns to face the direction of the sun as it moves across the sky.

Territorial behavior

This is a picture of a dog barking. It represents territorial behavior. Animals perform territorial behavior to defend their territory from intruders. Types of territorial behavior include scent marking, visual marking, and auditory marking. If those are ineffective, the animal may resort to physical violence. This picture was taken just as a guest entered the house, which is this dog's territory. She attempted to scare the "intruder" off by barking and growling.

Seed dispersal

This is a picture of a perennial sow thistle. It represents a method of seed dispersal. Seed dispersal is the way seeds move away from their parent plant so that they can begin to grow. Methods of seed dispersal fall into two categories: Autochory and Allochory. Autochory is the type of dispersal that does not require any help from outside forces, including natural ones. Allochory is the type of dispersal that does use outside forces such as animals, water, and wind. The plant pictured is an allochorous plant, since it uses the wind to disperse its seeds in a very similar way to dandelions.

Rhizome

This is a picture of a plant that grows on the forest floor. It represents a rhizome. A rhizome is an underground modified plant stem that constantly sends up new shoots. Rhizomes are continually growing, and if they are broken, the part that is detached from the original plant will grow into a new independent plant.

Radial symmetry

This is a picture of a sea urchin. It represents radial symmetry. Radial symmetry is a type of symmetry that revolves around a central axis. If you were to cut an organism that has radial symmetry like a pizza, each "slice" would be identical. Radial symmetry is one of three types of symmetry, the other two being asymmetry and bilateral symmetry. The two phyla which have radial symmetry are cnidaria and echinodermata, the phylum which sea urchins like the one pictured belong to.

Pollinator

This is a picture of a honeybee. It is an example of a pollinator. A pollinator is an animal that moves pollen from one plant to another, therefore fertilizing the plant it moved the pollen to. Bees, like the one pictured, are the most common type of pollinator. They have a symbiotic relationship with the plants they gather pollen from, since they gain energy for themselves by eating pollen and nectar as well as helping the plant.

Pollen

This is a picture of flowers. They represent pollen. Pollen is a fine yellow powder produced in the anther of flowering plants. Each pollen grain is a microgametophyte, which produces male gametes (sperm). The pollen is then transferred to another plant by a pollinator to fertilize the new flower, which will now produce fruit. Pollen is what gives the center of these flowers their yellow color.