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BIOLOGY
EOC10-DAY
REVIEW
Written by Chris Jackson, Ed.D.Edited by M. Napier
www.hedgehoglearning.com© Hedgehog Learning
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All clipart and images used in this review are either created by Hedgehog Learning, found in public domain, or used with permission from iStockphoto, iClipart, Microsoft, or www.123rf.com
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CELL STRUCTURE AND FUNCTIONTEKS B.4B, B.4C
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• Cells are the smallest unit of living things
• Simple cells are prokaryotic(bacteria)
• Complex cells are eukaryotic(plant and animal cells)
• What are the primary function of these cellular organelles?• Cell membrane• Cytoplasm• Nucleus• Mitochondria• Ribosomes• Endoplasmic Reticulum• Lysosome• Vacuole• Cell wall (plant)• Chloroplast (plant)
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• Cell membrane (all cells) – Surrounds the cell and controls what enters and leaves
• Cytoplasm (all cells) – Suspends the organelles in a eukaryotic cell within the cell membrane
• Nucleus (eukaryotes) – controls the cells activities and contains the cell’s DNA
• Mitochondria – converts food into energy
• Ribosomes (all cells) – makes proteins
• Endoplasmic Reticulum – moves items within the cell like a pipeline
• Lysosome – contains enzymes
• Vacuole (plant) Vesicle (animal) – holds the material like water
• Cell wall (bacteria, some protists, fungi, plant cells) – surrounds the cell membrane to provide structure
• Chloroplast (bacteria, some protists, plant cell) – contains chlorophyll for photosynthesis
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Homeostasis – describes the equilibrium the cell maintains in response to its environment.
How would the cell maintain homeostasis in a salty (hypertonic) environment?
What part of the cell is responsible for maintaining homeostasis?
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Homeostasis is achieved by the cell membrane allowing material to flow in or out of the cell depending on the environment.
Types of Transport
ACTIVE TRANSPORT – requires the use of energy to move materials across the cell membrane
PASSIVE TRANSPORT – no energy required due to materials flowing from high concentration to low concentration (diffusion)
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Plant Cells
Energy conversion is through photosynthesis.
Energy from the sun is converted into a sugar called glucose.
Animal Cells
Energy conversion is through respiration.
Mitochondria release energy by breaking down molecules like glucose.
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MitochondriaSite of cellular respiration
ChloroplastSite of photosynthesis
Organic molecules and O2
CO2 and H2O
PLANTSANIMALS
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C6H12O6 + 6H2O + 6O2 6CO2 + 6H2O + ATP
6CO2 + 6H2O + sunlight C6H12O6 + 6H2O + 6O2
Reactants Products
glucose, water, oxygen carbon dioxide , water, energy
carbon dioxide , water, energy glucose, water, oxygen
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Cells can create more complex molecules from simpler molecules.
An example of this is protein synthesis where proteins are created by joining amino acids together during RNA translation.
Amino Acid Amino Acid Amino Acid
Protein
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Cells and Viruses
• Turn to a classmate and create a list of characteristics of viruses and cells.
• What qualities did you come up with?
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Viruses
• Non-living• No metabolism• Has “capsid” with nucleic acids• Depends on host cell for
reproduction• Do not respond to antibiotics• Can causes diseases like
Influenza and HIV• Injects nucleic acid
Bacteria Cells
• Living• Metabolic processes• Has circular nucleic acid• Reproduction is through
mitosis/binary fission• Can be killed with antibiotics• Can causes infections like
strep throat and meningitis • Releases toxins
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HIV is particular dangerous virus because:
• It attacks human T-cells as its host. These cells are critical to the human immune system.
• It is sexually transmitted.
• It cannot be treated with antibiotics.
• It may undergo a latency period without being detected, allowing an infected person to pass the virus unknowingly.
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CELL STRUCTURE AND FUNCTIONTEKS B.5A, B.9A
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I – Interphase: Cell grows, develops, and duplicates its DNA
M – Mitosis: Cell division is occurring
G1 – First Gap: Cell growth
S – Synthesis: Cell replicates its DNA
G2 – Second Gap: More cell growth and preparation for division
G0 – “Holding” stage if cell density is too high
What percentage of time is spent in Interphase?
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PROPHASE
The nuclear membrane disintegrates. The chromatin is condensing into chromosomes. Centrioles move toward poles
METAPHASE
The chromosomes align at the metaphase plate in the middle of the cell.
ANAPHASE
The chromosomes split and the spindle shortens pulling chromatids to opposite ends of cell.
TELOPHASE
The decondensingchromosomes go back into chromatin and are surrounded by nuclear membranes.
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Cytokinesis occurs at the end of telophase, separating the cytoplasm into two new cells
Mitosis results in two identical daughter cells Asexual reproduction – one cell dividing into
two identical Mitosis occurs in somatic (body) cells
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What phases of the cell cycle can you identify in the picture to the left?
Identify a cell in:
G1 InterphaseG2 InterphaseProphaseMetaphaseAnaphaseTelophase
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Structure and Function Example
Carbohydrate
Lipids
Proteins
Nucleic Acids
With a partner, fill in the “Structure and Function” and “Example” columns for the following biomolecules.
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Glucose
Carbohydrates (CHO)
• Sugars and starches
• Contains Carbon, Oxygen, and Hydrogen
• Source of energy (glucose)
• Structural molecule (cellulose)
• Easy to digest
• Water soluble
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Lipids (CHO)
• Oils, fatty acids, wax, and steroids
• Chains of carbon, oxygen, and hydrogen
• Source of energy (fats)
• Chemical messenger (cholesterol)
• High caloric density
• Insoluble in water
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Proteins (CHON)
• Enzymes and hormones
• Chains of amino acids
• Can be a source of energy
• Large and complex molecules
• Transport molecule (hemoglobin)
• Chemical messenger (insulin)
• Structural molecule (collagen)
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Nucleic Acids (CHONPS)
• RNA and DNA
• Carrier of genetic information
• Instructions for protein synthesis
• Large and complex molecules
• Contains carbohydrate group, phosphate group, and nitrogen base
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MECHANISMS OF GENETICSTEKS B.6A, B.6E
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Characteristics of DNA
• Carries genetic information for traits in an organism
• Twisted, double-helix structure
• Coding is carried in two sets of complimentary bases:• Adenine-Thymine• Guanine-Cytosine
• Strands of millions of nucleotides
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Nucleotides
• DNA is a strand of thousands or millions of nucleotides
• Nucleotides consist of:• A Phosphate Group• Sugar• Nitrogen Base (A, T, C, or G)
• Three nucleotides create a codonor triplet
• Each triplet will code for a particular amino acid
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• Each codon, or triplet, on mRNA codes for a particular amino acid.
• There are 21 possible amino acids.
• These chains of amino acids create a protein.
• Each protein will have a specific function resulting in a particular trait in the organism.
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Suppose a mRNA strand has the following bases:
CGA-ACU-UUA
What three amino acids would be produced?
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A mutation occurs when a nitrogen base is either inserted, deleted, or changed from the original.
A mutation can:• Create a new trait that is
beneficial• Create a new trait that is
harmful• Result in no change
because the codon still results in the same amino acid
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Suppose a DNA strand has the following bases:
UGU-CUU-GCA-AGU
However, CUU undergoes a mutation and is changed to CUA.
Will this result in a change in protein synthesis?
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Answer: NO
CUU codes for Leucine.
CUA also codes for Leucine.
Therefore, there will be no difference in the protein produce.
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Mutations
• DNA is altered by either:• Inserting a nitrogen base (A, T, G, or C) into a DNA sequence• Deleting a nitrogen base (A, T, G, or C) from a DNA sequence• Changing a nitrogen base in a DNA sequence (A G)
• A mutation may cause no effect if the codon in the DNA sequence still codes for the same amino acid.
• A mutation will be noticed if the codon in DNA sequence codes for a new amino acid. In this case the mutation may be either harmful or beneficial to the organism.
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Transcription – mRNA reads DNA for code
Begins in nucleus
Takes message through cytoplasm to ribosome
Codons/triplets code for amino acids
Translation – protein is made
mRNA (with codons) and tRNA (with anticodons and amino acids) to make a polypeptide chain (protein)
Occurs in the ribosome
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MECHANSIMS OF GENETICSTEKS B.6E, B.6F
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Meiosis I and II occur in the reproductive organs’ cells creating gametes (reproductive cells)
Start with diploid (2n), divide twice to create 4 unidentical haploid (n) cells
Genetic diversity occurs due to crossing over in Prophase I. (chromosomes exchange genes)
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Genetics is the study of the odds and percentages any given offspring will have a set of traits.
Three Laws of Mendelian Genetics:
1. Alleles (form of a gene) segregate and recombine, and one allele is inherited from each parent.
2. Traits are independent of one another (hair color does not affect height).
3. One trait may mask another trait for the same thing (dominant over recessive).
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Green Dog (male) and Yellow Dog (female) meet, fall in love, and get married. Green and Yellow have four puppies.
If yellow coats (Y) in dogs are dominant to green coats (y), and both parents are homozygous, what are the likely colors of their four puppies?
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Y Y
y
y
Yy Yy
Yy Yy
This is an example of a monohybrid cross (one trait).
Each of the puppies will be yellow, but heterozygous.
The phenotype of each puppy is yellow.
The genotype of each puppy is Yy, meaning that each puppy carries a recessivegreen allele.
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Now let’s suppose Yellow Dog has a genotype of Yy and carries a recessive green allele. What is the genotype of Green Dog?
What are the possible colors of their four puppies?
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Y y
y
y
Yy yy
Yy yy
Two puppies will likely be green and two puppies will likely be yellow.
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Example of dihybrid cross (two traits): Yellow Dog has a short tail (recessive), and Green Dog has a long tail (dominant). Green Dog is heterozygous for a long tail.
What are the possible colors and tail lengths of their four puppies?
Color – yyTail - Tt
Color –YyTail - tt
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Yt Yt yt yt
yT
yT
yt
yt
Complete the dihybrid cross.
What are the odds a puppy will be:
yellow, long tailyellow, short tailgreen, long tailgreen, short tail
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Non-Mendelian genetics do not follow the traditional laws of genetics. Non-Mendelian examples include:
• Incomplete dominance – a white rose and a red rose produce a pink rose.
• Linked genes – hemophilia and red-green colorblindness have a high correlation in men.
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BIOLOGICAL EVOLUTION AND CLASSIFICATIONTEKS B.7A, B.7E
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Common ancestry is the theory that all organisms descended from a single ancestor. Support for this idea is found in:
• Fossil record – shows the variety of organisms that have existed over time, going from very simple to more complex organisms over billions of years
• Biogeography – indicates that organisms that live geographically closer are more likely to be genetically similar
• Anatomical homology – structural similarities among different species that serve different purposes (i.e., a bird’s wing and a human’s arm)
• Molecular homol0gy – DNA and other molecular similarities between different species
• Developmental homology – embryonic and early developmental similarities
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Each of the following examples give support for common ancestry. Identify each piece of evidence as derived from either:
1) Fossil record 2) Biogeography 3) Anatomical homology4) Molecular homol0gy5) Developmental homology
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The bone comparison between a human, dog, bird, and whale is an example of _____________________.
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Anatomical Homology
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Define the following structures:
Homologous structures
Analogous structures
Vestigial structures
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The proximity of like fossils that supports continental drift is an example of ___________________________.
University of California - Berkley
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Biogeography
University of California - Berkley
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The ________________ indicates that A. africanus is likely an ancestor of humans.
Australopithecus africanus3 million years ago
Homo sapienCurrent day
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Fossil Record
Australopithecus africanus3 million years ago
Homo sapienCurrent day
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Chimps and humans share 99% of DNA coding, an example of ______________________________.
99% Identical
DNA
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Molecular Homol0gy
The fewer the differences, the closer the evolutionary relationship.
99% Identical
DNA
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_______________________ suggests that embryos of many organisms share similar characteristics.
Tortoise Embryo
Rabbit Embryo
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Developmental Homology (Embryology)All vertebrate embryos contain gill slits and a tail bone in the early stages of development.
Tortoise Embryo
Rabbit Embryo
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Natural Selection is a process that selects for those organisms that are the best fit in their environment to survive and reproduce.
Adaptations allow populations to evolve. Gene flow – new alleles brought into
population (migration may cause this) Genetic drift (one type of allele begins to
dominate)
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BIOLOGICAL EVOLUTION AND CLASSIFICATIONTEKS B.8B
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Hierarchical classification is a method of assigning organisms into groups and subgroups
based on similar characteristics.
Domain
Species
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3 Domains: Bacteria, Archaea, Eukarya
8,700,000 non-bacterial Species
Increasing similarity in DNA within the group or taxon
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Phylogeny – an organism’s evolutionary history which can be used to classify it.
Present Day Organisms
Evolutionary Past
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Organism A
Organism B
Organism C
Organism D
Organism E
Organism F
Organism G
Organism C is most closely related to which other organism?
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Organism A
Organism B
Organism C
Organism D
Organism E
Organism F
Organism G
Organism C is most closely related to which other organism?
1 degree of separation
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Organism A
Organism B
Organism C
Organism D
Organism E
Organism F
Organism G
Organism A is most closely related to Organism D or Organism G?
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Organism A
Organism B
Organism C
Organism D
Organism E
Organism F
Organism G
Organism A is most closely related to Organism D or Organism G?
There are 2 additional degrees of separation with Organism D.
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BIOLOGICAL PROCESSES AND SYSTEMSTEKS B.10A, B.10B
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Discuss with a partner which body system(s) would be used for running.
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In some form, each of these body systems are used in either the act of and providing energy for running.
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Food is chewed, swallowed, and passed into the stomach where it is broken down into nutrients. The nutrients are then absorbed into the blood in the small intestine and distributed
What three body systems are primarily interacting with each other in this example?
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Food is chewed, swallowed, and passed into the stomach where it is broken down into nutrients. The nutrients are then absorbed into the blood in the small intestine and distributed.
• Muscular – chewing and swallowing food• Digestive – breaking down food into nutrients in
the stomach and small intestine• Circulatory – distribution of nutrients by the blood
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A virus is inhaled from the nearby air and enters the lungs. Mucus is secreted and traps the virus. T-cells then destroy the virus. A cough is triggered by the brain to remove the virus and mucus.
What three body systems are primarily interacting with each other in this example?
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A virus is inhaled from the nearby air and enters the lungs. Mucus is secreted and traps the virus. T-cells then destroy the virus. A cough is triggered by the brain to remove the virus and mucus.
• Respiratory – breathing in and trapping the virus• Immune –T-cells destroy the virus• Nervous – brain sends signal to cough
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A hormones in a female opossum are produced that initiate ovulation.
What two body systems are primarily interacting with each other in this example?
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A hormones in a female possum are produced that initiate ovulation.
• Endocrine – excreting hormones• Reproductive – ovulation for sexual reproduction
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A drop in calcium in the blood triggers the release of a hormone called PTH from the parathyroid gland. PTH causes the kidneys to reabsorb more calcium from urine and the release of calcium from bones. The kidneys also produce Vitamin D, triggering the small intestine to absorb more calcium.
What body systems interact in this example?
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• Circulatory – blood has less calcium• Endocrine – parathyroid gland produces PTH• Excretory – kidneys reabsorb more calcium from urine• Skeletal – release of calcium from bones• Digestive – more calcium is absorbed from food
This is an example of _____________.
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• Circulatory – blood has less calcium• Endocrine – parathyroid gland produces PTH• Excretory – kidneys reabsorb more calcium from urine• Skeletal – release of calcium from bones• Digestive – more calcium is absorbed from food
This is an example of homeostasis or regulation.
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What systems of the tomato plant are involved in the description below?
Water and nutrients are absorbed and transported from the soil to the fruit.
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Water and nutrients are absorbed and transported from the soil to the fruit.
Root system uptakes water.
Xylem vessels transport water and nutrients upward through the shoot system to the fruit.
Root System
Shoot System
Xylem Vessels
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What systems of the tomato plant are involved in the description below?
Sugars are produced in the leaves and transported to the roots.
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Sugars are produced in the leaves and transported to the roots.
Phloem vessels transport sugars from the leaves throughout the plant.
Root System
Shoot System
Phloem Vessels
Leaves
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What systems of the tomato plant are involved in the description below?
Hormones are produced triggering seed production and growth.
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Hormones are produced triggering seed production and growth.
The root system produces hormones.
Xylem vessels move the hormones upward through the shoot system producing a flower.
Root System
Shoot System
Xylem Vessels
Pistil (female)Stamen (male)
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INTERDEPENDENCE WITHIN ENVIRONMENTAL SYSTEMSTEKS B.11D, B.12A
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The forest in the picture experienced a destructive fire last year.
Explain what you see happening in terms of ecological succession.
Is this primary or secondary ecological succession?
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Ecological succession is the process of building (primary) or rebuilding (secondary) an ecosystem over time.
Primary Succession Opportunities• New volcano lava covering a landscape• Retreat of a glacier uncovering bare ground• Mining in side of mountain
Secondary Succession Opportunities• Wild fire• Harvesting of trees for lumber production• Hurricanes, landslides, or tornadoes
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Lichens are called pioneer organisms and are the first organisms to appear in primary succession. At first, the species diversity is low, but eventually mosses, grasses, shrubs, and trees appear. The lichens cannot compete and disappear.
Lichens Mosses Ferns/Grasses Shrubs Trees
Low Diversity High Diversity
TIME
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TYPES OF RELATIONSHIPSPredation One species captures and feeds on other type of species.
Competition Two species struggle for the same limited resources.
Parasitism One species benefits at the expense of another species.
Commensalism One species benefits from one another, but does no harm.
Mutualism Two species mutually benefit from one another.
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Name This Relationship Predation, Competition, Parasitism, Commensalism, or Mutualism
Human Head Louse
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Name This Relationship Predation, Competition, Parasitism, Commensalism, or Mutualism
Hummingbird feeding on nectar while pollinating a flower.
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Name This Relationship Predation, Competition, Parasitism, Commensalism, or Mutualism
Eagle catching fish.
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Name This Relationship Predation, Competition, Parasitism, Commensalism, or Mutualism
Plants in a dense rain forest
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Name This Relationship Predation, Competition, Parasitism, Commensalism, or Mutualism
An egret looking for insects stirred up by the movement of the rhino.
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INTERDEPENDENCE WITHIN ENVIRONMENTAL SYSTEMSTEKS B.12C, B.12F
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Roles of Organisms in an Ecosystem
PRODUCER – Makes own food from sun’s energy
CONSUMER – Gets food from other organisms
• Primary – Eats plants • (HERBIVORES eating PRODUCERS)
• Secondary – Eats animals that eat plants • (CARNIVORES eating HERBIVORES)
• Tertiary – Eats animals that eat other animals • (CARNIVORES eating CARNIVORES)
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.1% of Energy
Producers – Largest amount of energy, number of organisms, and biomass
10% of Energy
1% of Energy
Primary Consumers
Secondary Consumers
Tertiary Consumers
Solar Energy
100% of Energy
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In the food web, identify:
• Herbivores, carnivores, and producers
• Organisms at the second trophic level
• Organism with the highest concentration of toxins
• Which organism represents the highest amount of energy and biomass
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Changes in the environment, whether natural or human-caused, may affect the stability of an ecosystem.
These changes can affect the populations, possibly causing some species to increase in number while others decrease.
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Discuss the ecological impacts of draining runoff water in rivers like in the picture to the right.
What populations will increase?
What populations will decrease?
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Discuss the ecological impacts of drought like in the picture to the left.
What populations would be the first to suffer?
What populations are most likely to be least effected?
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1. Open “Jeopardy – Biology EOC Review” on the CD2. Follow the directions in the folder on Day 10.3. Have fun!
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Best wishes for success on the Biology EOC!
Written by Chris Jackson, Ed.D.www.hedgehoglearning.com
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