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life science terms part 2
#28-37
22
Science
7th Grade
11/16/2009

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Term
Abiotic factors
Definition
the non-living things in an organism's habitat, or man-made things. Ex:soil, water, air, rocks, temp, humidity, wind, plastic, metals
Term
Biotic factors
Definition
the living things(ordead things but were once living) in an organisms habitat. Ex:bacteria, trees, all animals, moss, leaves, rotting tree branch, lichen, lumber.
Term
Mulualism
Definition
when there is a close relationship between 2 organisms and both benefit from the relationship. Ex:coral and algae; cow birds and cows; hippos and oxpeckers; humans and e-coli biacteria; sharks and remora eel; lichen and algae
Term
Commensalism
Definition
when there is a close relationship between 2 organism; 1 benefits but the other is neither harmed nor helped. this relationship is rare in nature. Ex:oak tree and spanish moss; orchid and banyan tree
Term
Parasitism
Definition
a relationship between 2 organisms where one benefits and the other is harmed. the parasite benefits and the host is harmed. Ex:fleas and dogs; tapeworms and humans; tick and deer; leeches and fish; lice and humans.
Term
limiting factor
Definition
a factor in the environment that keeps an organisms population from increasing. Ex:amount of food available; amount of water alaiable; temp; amount of space alaiable; nutrients in soil; weather
Term
Gymnosperm
Definition
a type of seed plant that produces "naked" seeds because they are not protected by fruit. Ex:pine trees, cypress trees, cedar trees, sago trees, ginkgo trees, sequoia(red wood)
Term
Angiosperms
Definition
a type of flowering plant. Once the flower is pollinated it produces seed covered with fruit. Ex:azales, lemons, oak trees, tomatoes, lilies, pumkins, rose
Term
Monocots
Definition
1.one cotyledon(1 seed leaf)
2.veins in the leaves are parallel to each other.
3.vascular tissue is scattered in the stem.
4.flower parts in threes(3, 6, 9) Ex:grass, daisy, sunflower, corn
Term
Dicot
Definition
1.two cotyledons (2 seed leaf)
2.veins in the leaves are branching
3.vascular tissue is arranged in a ring shape in the stem
4.flower parts in fours or fives(4, 8, 12, 5, 10) Ex:oak, hickory, sweetgum, elm, maple
Term
Species
Definition
a group of like organisms that can mate and produce fertile offspring(offspring can have offspring of their own). Ex:deer, bears, raccoons, opossums, pine trees, oak trees, humans
Term
population
Definition
all the members of 1 species in a particular area. Ex:all the birds in a forest
Term
community
Definition
all the different populations living together in an area. Ex:all the deer, black bears, raccoons, opossum, pine trees in a the southern alabama forest.
Term
Ecosystem
Definition
the community or organisms that live in a particular area, along with the nonliving surroundings. Ex:all the deer, black bear, raccoons, opossum, pine trees, oak trees, water, soil, and rocks in a southern alabama forest
Term
predator
Definition
the organisms that hunts and kills the organisms that they're stalking. Ex:wolf, tiger, lion, bear, shark, owl
Term
prey
Definition
the organisms that is hunted, killed, and eaten by another organism. Ex:rabbit, deer, mouse
Term
Mitosis
Definition
cell reproduction in all regular body cells. The cell divides in 1/2 creating 2 identical cells with one nuleus and a complete copy of the cell's DNA
Term
Meiosis
Definition
cell reproduction that occurs in the reproductive glands only (overies and testies). The cells divide creating 2 cells but they only have 1/2 the DNA material. during sexual reproduction when the egg is fertilized by the sperm cell it gets 1/2 the DNA from the fater and 1/2 from the mother(64 chomomes=DNA
Term
Genotype
Definition
an organism's genetic combination. Ex:brown eyed ppl have a genotype of Bb or BB; blue eyed ppl always have a genotype of bb
Term
phenotype
Definition
an organisms physical apparence because of their genetic make-up. Ex:Bb=a brown eyed person; bb=blue eyed person.
Term
dominant gene
Definition
the stronger of the 2 genes that controles what the organism looks like(phenotype). Ex:brown eyed or dominant over blue eyes. Bb(brown eyed person) or BB(brown eyed person)
Term
Recessive gene
Definition
the weaker or hidden of gene combination. Ex:blue eyes are recessive; bb(blue eyed person)
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