25. Modified Stem of a Plant

This is a picture of a modified stem of a plant. A modified stem of a plant is a specially transformed stem. They transform to perform special functions. This plant's stem was modified for appearance purposes.

24. Pollen

This is a picture of a clover weed. Clover weeds are a pollen and nectar source. Pollen is a powdery substance produced by the male part of a flower, of the anthers of seed plants. Pollen is noticed by humans because it arouses allergic reactions from many people.

23. Ethylene

This is a picture of apples. Apples produce ethylene when ripening. Ethylene is a hydrocarbon gas given off by ripening fruit. Ethylene is what changes the texture and color of fruits when ripening. Other fruits that produce ethylene when ripening are pears and bananas.

22. Exoskeleton

This is a picture of a dragonfly. Dragonflies are an example of an organism with an exoskeleton. An exoskeleton is the outer covering for some invertebrates. It provides support and protection for the organism. Dragonflies, following their larval stage, crack open their exoskeleton to release their abdomen and wings.

21. Frond

This is a picture of a fern. The leaf or leaf-like part of a fern, palm tree, or other similar plant is called a frond. Fronds are usually large, finely divided leaves.

20. Auxin Producing Area of a Plant

This is a picture of a flower with developing buds. Auxin is a hormone most typically found in developing seeds/fruits/buds. Auxin is a plant hormone that regulates plant growth and elongation. It also allows for growth and development of cells in shoots.

19. Basidiomycete

This is a picture of a mushroom. Mushrooms are an example of basidiomycetes. A basidiomycete is a fungus that produces spores on basidium. Basidiomycetes include any subdivision of fungi, which consist of mushrooms, rusts, and puffballs.

18. Endotherms

This is a picture of a horse. Horses are an example of an endotherm. Endotherms are animals that are capable of internal generation of heat. Endotherms are able to maintain a specific temperature despite their environmental conditions. Other examples of endotherms are cows, birds, and other mammals.

17. Ectotherm

This is a picture of turtles. Turtles are an example of ectotherms. Ectotherms are organisms that depend on the external environment for its source of body heat/cooling. Turtles lie out of the water during the day to get warm from the sun. Other examples of ectotherms include alligators, snakes, and lizards.

16. Animal that has a Segmented Body

This is a picture of an ant. An ant is an example of an animal that has a segmented body. A segmented body is when an organism's body is divided into different functional units (head, thorax, abdomen). Arthropods, annelids, and vertebrates are three major groups with segmented bodies.

15. Parenchyma Cells

This is a picture of a plant leaf. Parenchyma cells are cells that fill up the inside of non-woody plant structures, for example stems, roots, and leaves. It is the fundamental tissue of plants. The function of the parenchyma cells is to store water and nutrients for the plant.

14. Cambium

This is a picture of a tree trunk. Inside the trunk is the cambium. Cambium is a layer of cellular tissue between the xylem and phloem (wood and bark) inside the trunk. It is responsible for the secondary thickening and growth of tree trunks.

13. Flower Ovary

This is a picture of a flower. Within the center of this flower is the flower ovary. The flower ovary is the female organ of the flower that contains the ovules used for reproduction. It is located under the stigma and style which can be visible as the longest and biggest projection from the center of the flower.

12. Cuticle Layer of a Plant

This is a picture of a leaf. The cuticle layer of this leaf is the shiny, waxy layer. The cuticle is secreted by the epidermis, and this layer helps the plant to retain its water. The layer also serves to protect the plant from predators and parasites.

11. Seed Dispersal

This is another picture of a dandelion. Seed dispersal is the transport of seeds away from a parent plant. The petals/seeds on dandelions are easily blown off by the wind. Therefore, this is an example of seed dispersal because the wind transports the seeds of the dandelion away from the original parent plant. Seeds are also dispersed by animals and water.

10. Vestigial Structures

This is a picture of a dandelion. Dandelions are an example of organisms with vestigial structures. Vestigial structures are structures in an organism that lost all or most of its original function over the course of human evolution. Dandelions have the organs for sexual reproduction (stamen and pistil) but reproduce using asexual reproduction. Other examples of vestigial structures are the human appendix and the human coccyx (tailbone).

9. Hydrophobic

This is a picture of corn syrup. Corn syrup is an example of a hydrophobic compound. Unlike a hydrophilic compound, hydrophobic compounds tend to repel and not mix well with water. Hydrophobic substances are nonpolar. Oil and fat are other examples of hydrophobic compounds.

8. Hydrophilic

This is a picture of sugar. Sugar is a hydrophilic compound. Hydrophilic compounds tend to mix with, dissolve in, or get wet by water. These compounds also interact with water through hydrogen bonding. Salt is another example of a hydrophilic compound.

7. Long-Day Plant

This is a picture of clovers. Clovers are an example of long-day plants. Long-day plants are plants that flower only after being exposed to light and sun for longer than normal periods. Spinach and lettuce are also other types of long-day plants.

6. Lichen

This is a picture of lichen on a log. Lichen is a plant that slowly grows on rocks, walls, and trees that typically forms a low crust-like, leaf-like, or branching shape. Lichen absorbs its nutrients from the air and rain, so it's usually used to indicate the pollution status in a certain environment.

5. Autotroph

This is a picture of grass. Grass is an example of an autotroph. An autotroph is an organism that's capable of forming nutritional organic substances from inorganic substances. Grass uses sunlight, using methods like photosynthesis, to get energy.

4. Gymnosperm Leaf

This is a picture of pine needles. Pine needles are an example of a gymnosperm leaf because pine needles are the leaves of pine trees. Gymnosperm leaves come from gymnosperms, which are plants with seeds that develop on the outer surface and are usually conifers.

3. Gymnosperm Cone

This is a picture of a (wet..) pinecone. A pinecone is an example of a gymnosperm cone. A gymnosperm cone grows on gymnosperms, which are plants with seeds that develop on the surface of scales or leaves, usually forming cones (thus, gymnosperm cone).

2. Anther and Filament of Stamen

This is a picture of a flower. The filament of this flower is the long, thin structure that connects to the center base of the flower. The anther is the small ball-like structure on the end of the filament. Together, the anther and filament is called a stamen. These are the male reproductive parts of a flower. The filament also contains sacs that produce pollen.

1. Bilateral Symmetry

This is a picture of a ladybug. Ladybugs are an example of organisms with bilateral symmetry. Bilateral symmetry is when an organism can be divided along the midline and the resulting left and right sides are approximate mirror images of one another. Ladybugs, like many other organisms, have mirroring sides.