Biology of Plants Practicum Terms

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1. 
A seed-producing annual, biennial, or perennial that does not develop persistent woody tissue, but dies down at the end of a growing season. May be valued for its medicinal, savory, or aromatic qualities.
 
Herb
 
2. 
A perennial, low, woody plant with several stems arising from or near the ground.
 
Shrub
 
3. 
A woody perennial plant having a single usually elongated main stem (trunk), generally with few or no branches on its lower part.
 
Tree
 
4. 
Narrow-leaved herb with jointed stems and spike-like flowers.
 
Grass
 
5. 
Non-vascular plant without true roots (rhizoids) and without vascular tissue. Haploid generation is dominant.
 
Moss
 
6. 
Vascular plant with true roots. Diploid generation is dominant. Leaves are fronds emerging with fiddleheads. Reproduces with spores.
 
Fern
 
7. 
A plant growing on another plant without deriving direct nutrition from host plant.
 
Epiphyte. Epi-upon. Phyte-plant.
 
8. 
A plant with long, slender, weak stems that are unable to support their own weight and are supported by other plants or trail on the ground - "hebaceous" or woody.
 
Vine
 
9. 
A woody vine supported by other plants.
 
Liana
 
10. 
A plant that obtains nutrients from another plant (host). The association is beneficial to the plant, but harmful to the host.
 
Parasite
 
11. 
A parasite completely dependant on the host.
 
Holoparasite
 
12. 
A parasite that obtains nutrients and water from the host, but is photosynthetic.
 
Hemiparasite
 
13. 
Having the characteristics of an herb. Stems have little or no woody tissue and persist usually for a single growing season.
 
Herbaceous
 
14. 
Having persistent stems containing wood, i.e. secondary growth via an active vascular cambium.
 
Woody
 
15. 
An hebaceous plant that grows from seed, reproduces then dies in one growing season.
 
Annual
 
16. 
A plant capable of growing for more than one season.
 
Perennial
 
17. 
A plant present or presumed to have been present in an area prior to the beginning of recorded history - not introduced by man.
 
Native
 
18. 
A plant intentionally or accidentally introduced by man outside of its native range.
 
Exotic
 
19. 
A species that invades natural communities, displaces native species, and alters ecological processes.
 

Invasive

 
20. 
Foliage remains green and functional through more than one growing season.
 
Evergreen
 
21. 
Looses leaves in a season.
 
Deciduous
 
22. 
A type of leaf complexity. Leaf with single blade.
 
Simple
 
23. 
A type of leaf complexity. Leaf with more than one blade/petiole.
 
Compound
 
24. 
A type of leaf arrangement. One leaf at each node.
 
Alternate
 
25. 
A type of leaf arrangement. One leaf on each side of the stem at a node.
 
Opposite
 
26. 
A type of leaf arrangement. More than two leaves at one node.
 
Whorled
 
27. 
A leaf margin characteristic. Leaf has smooth, unbroken outline with no teeth.
 
Entire. Other leaf margins include: serrated (teeth), doubly serrated (teeth on teeth), and incised (curved and pointed sections)
 
28. 
The outside edge of a leaf.
 
Margin
 
29. 
The stem like part of a leaf that attaches the blade to the actual stem.
 
Petiole
 
30. 
The place where the leaf attaches to the stem.
 
Node