the colors and shapes of the petals attract insets and other animals. these organisms ensure that pollination occurs.
what is the function of the petals of a flower?
the male reproductive parts that help produce new flowers
what is the function of the stamens of a flower?
the thin stalk that supports the anthers. it also gives nutrition to the anther
what is the function of the filaments of a flower?
a plant structure in seed plants that contains an egg cell.
what is the function of the ovules of a flower?
1) the angiosperm produces flowers. 2) inside the ovary, an egg cell is produced in each ovule of the pistil. the cells in the anther produce pollen grains. 3) the pollen grains are trapped in the stigme. 4) the pollen grains produce a pollen tube that grows into the ovule. a sperm cell moves through the pollen tube and joins with the egg cell. 5) the ovule develops into a seed. the ferilized egg becomes the seed's embryo. other parts of the ovule develop into the seed coat and the seed's stored food. 6) the ovary and other structures develop into a fruit that encloses the seeds. the fruit helps in seed dispersal. 7) a seed grows into a new plant.
what are the steps of an angiosperm life cycle?
an angiosperm that has two seed leaves. ex. violets, roses, dandelions, oak, maple trees... # of petals: a multiple of 5 and 4. shape of the leaves: wide with viens that branch. vascular tissue arrangement: in a circle.
what is a dicot? characteristics?
contain chloroplats that trap the energy in sunlight for photosynthesis
what is the function of the upper leaf cells in a leaf?
the many spaces between the lower leaf cells temporarily store carbon dioxide and oxygen.
what is the function of lower leaf cells in a leaf?
the vascular tissue through which nutrients and water absorbed by the plants flows from the roots up into the leaves and stems.
what is the function of xylem?
the food made during photosynthesis enters the phloem and travels from the leaves to the stems and roots.
what is the function of phloem?
the internal transporting tissue in some plants that is made up of a tubelike structure.
what is vascular tissue?
the thin, root-like structure that anchors a moss and absorbs water and nutrients for the plant.
what is a rhizoid?
the plant structure that contains a young plant inside a protective covering.
what is a seed? (are you kidding me?!)
a plant that produces seeds that are not enclosed by a protective covering.
what is a gymnosperm? (remember, people tend to wear less clothing in GYMs)
a plant that produces seeds that are enclosed in a protective structure.
what is an angiosperm? (ANGles wear more clothing)
1) obtainig water and nutrients from the soil. 2) retaining water with cuticles. 3) transporting water, food, and munerals using vascular tissue. 4) support and strength by vascular tissue. 5) reproduction.
what are 5 plant adaptations for living on land?
1) sporophyte 2) grow into gametophyte produce sperm/egg 3) fertilization. 4) zygote 5)embryo grows into sporophyte
what is the life cycle of moss?
tiny particles produced by plants that contain the microscopic cells that later become sperm cells.
what is pollen?
an angiosperm that has only one seed leaf. ex. corn, wheat, rice, lilies, tulips. # of petals: a multiple of 3. shape of leaves- parallel veins. vascular tissue arrangement: scattered randomly
what is a monocot? characteristics?
1) production of naked seeds 2) scale-like/needle-like leaves. 3) deep growing root systems.
what are 3 characteristcs of gymnosperms?
1) low growing. 2) have no vascular tissue. 3) obtain water and minerals directly from soil. 4) 3 types of nonvascular plants are liverworts, mosses, and hornworts. 5) no true roots, leaves and stems.
what are characteristics of nonvascular plants?
means the process by which plants and some other organisms captures light energy and use it to make food from carbon dioxide adn water
the first scientist to classify organisms. a. he grouped animals according to their environment-land, water, air. b. today we use his method of "observationh" and creating subgroups.
called the founder of modern taxonomy. he divised a naming system called binomial nomenclature.
the naming system organized by Linnaeus. in this, each organism is given a two-part name.the first part being its genus, the second being its species. these two characteristics put together make up an organisms scientific name.
is a classification grouping that contains similar, closely related organisms. this is also the first part of an organism's scientific name.
is a group of similar organisms that can mate and produce fertile offspring in nature. it is also the second part of an organism's scientific name.
is a series of paired statements that describe the physical characteristics of different organisms.
they are unicellular and have no nucleus. this type of bacteria is found in yogurt. helps fight off bad bacteria.
are mushrooms, mold, and mildew. they feed on dead or decaying organisms. they are decomposers.
organisms in this group are more complex than plants. they are multicellular and are heterotrophs. this means they do not make their own food and rely on an outside food source.
is a reproductive process that involves only one parent and produces offspring that are identical to the parent.
a form of asexual reproduction. the cell first duplicates its genetic material and then divides into two separate cells. each new cell gets its own complete copy of the parent cell's genetic material as well as some of the parent's ribosomes and cytoplasm
where one bacterium transfers some of its genetic material into another bacterial cell through a thin, threadlike bridge that joins the two cells. after the transfer, the cells separate.it results in the production of new bacteria which are genetically different than the parent cells.
small, nonliving particle that invades and then reproduces inside a living cell. it does not grow, isnt made up of cell(s). does not respond, cannot make food or take it in, and doesnt produce wastes. but it can reproduce and has DNA. it also acts like a parasite.
after entering a cell, an active virus immediately goes into action. the virus' genetic material takes over the cell's functions, and the cell quickly begins to produce the virus' proteins and genetic material. then these parts assemble into new viruses. like a photocopy machine left in the "on" position, the invaded cell makes copy after copy of new viruses. when it is full of new viruses, the host cell bursts open and releases the new viruses.
the small, rounded, thick-walled, resting cell that forms inside a bacterial cell. it allows bacteria to survive harsh conditions (heat, freezing).
the genetic material of these viruses enters a host cell. then its genetic material becomes part of the cell's genetic material. the virus does not appear to affect the cell's functions. the virus' genetic material may stay in this state for a while. then, for reasons, that scientists do not yet fully understand, the virus' genetic material suddenly becomes active. it takes over the cell's functions like the active viruses do. in a short time, the cell is full of new viruses and it bursts open to release them. ex. cold sores.
substance that stimulates the body to produce dhemicals that destroy viruses or bacteria. ec. polio, mumps, rubella, smallpox, measles, chicken pox, tetanus.
animal-like protists that use flagella to move. most of them have on to eight flagella. many of them live inside the bodies of other organisms. ex. intestines of termites. they digest the wood that the termites eat, producing sugars for themselves and for some termites.
a funnel-like indentation lined with cilia. the cilia move water containing food into the vacuole that forms at the end of the oral groove.
ce on a layer of slime that it produces. most have more than one host. ex. malaria:two hosts are involved-humans and a species of mosquitoes. spreads when mosquito bites a person with malaria, infected+ bites a healthy person.
when both partners benefit from living together, the relationship is a type of symbiosis called mutualism
small hair-like structures used for movement. it sweeps food particles into the oral groove and it senses the environment.
temporary bulges of the cell membrane that fill with cytoplasm. it means "false foot". they from when the cell membrane pushes outward in one location. it is used to engluf food particles through a process called phagocytosis.
when diatoms die, their cell walls collect on the bottoms of oceans asnd lakes. over time, they form layers of a coarse material called diatomaceous earth. this makes a good polishing agent. ex. toothpastes, many household scouring products as well as in swimming pool filters, and insecticides.
branching, threadlike tubes. they are found in multicellular fungi and transport food, water, and minerals throughout the fungi.
yeast cells use the sugar in things for food and produce carbon dioxide gas as they feed. the gas forms bubbles, which makes things like dough to rise. without it, bread would be flat and solid. it is also used in wine so alcohol and carbon dioxide can be produced.
small particles, like those of water, pass easily though the cell membrane into the cytoplasm so things like amebas have problems. if the excess water were to build up inside the cell, the ameba would burst. fortunately, amebas hlave a contractile vacuole, a structure that collects the extra water and then expels it from the cell.
unicellular yeast cells undergo a form of asexual reproduction called budding. in budding, no spores are produced. instead, a small yeast cell grows from the body of a large, well-fed parent cell in a way that might remind you of a bud forming on the branch of a tree. the new cell then breaks away and lives on its own.
nutrients that contain nitrogen, as well as carbon, hydrogen, and oxygen are called proteins.
like carbohydrates, fats are high-energy nutrients that are composed of carbon, oxygen and hydrogen.
the substances in food that give the raw materials and the energy needed by the body are called nutrients
in chemical digestion, chemicals produced by the body break foods into their smaller chemical building blocks.
the tiny finger shaped structures that cover the inner surface of the small intestine are called villi. nutrient molecules pass from the small intestine into the bloodstream through the villi.
is the last section of the digestive system. it is about one and a half meters long. it runs up the right-hand side of the abdomen, across the upper abdomen, and then down the left-hand side. the large intestine contains bacteria that feed on the material passing through.
almost all chemical digestion and absorption of nutrients takes place in the small intestine. it is 6 meters long, it makes up 2/3 of the digestive system
is when an organism always produces an offspring with the same trait as the parent. ex. short plants produce shor offspring/tall plants produce tall offspring.
different forms of a gene. individual alleles control the inheritance of traits from each parent.
is the likelihood that a partifular event will occur, not necessarily what will occur. ex. coin toss-heads or tails are the possible outcomes. 1 in 2 probability. **the more tosses you make, the closer your actual results will be to the prdicted results of the prbability. the results of one toss do not affect the results of the next toss.
is a chart that shows all the possible combinations of alleles that can result from a genetic cross
is its genetic makeup or its allele combination. ex. Tall- pure tall=TT. hybrid tall (hides the recessive trait)=Tt
means that an organism has 2 identical alleles for a trait. ex. pure for a trait=>TT or tt
alleles are neither dominant or recessive. both traits appear in the offspring. ex. erminette chickens-black and white feather alleles are codominant. both colored feathers are present.
an organisms cells use energu to do their jobs. ex grow, repair injured parts, to digest foods
cell's energy use
all cells of living things are made up of chemicals- water (most abundant chemical), carbohydrates (source of energy), proteins and lipids (are the building blocks), and nucleic acids (generic material in DNA)
chemicals of life.
means that all organisms are made of small building blocks called cells. cell: is a basic unit of stucture and funtion in an organism. unicellular: is made up only one cell. multicellular: made of many cells.
stimulus-a change in surroundings that causes a reaction. ex. change in temperatures. responce-is the reaction to a stumulus. ex: you jump when scared.
response to surroundings
protects the cell and regulates what substances enter the cell. included in the plant and animal cell.
surrounds th4e cell membrane, giving it a box-like shape. made of cellulose. included in the plant cell
produces most of the cell's energy. "power house" included in the plant and animal cell
recieve materials from the endoplasmic reticulum and send them to other parts of the cell. they also release materials outside the cell. included in the animal and plant cell
capture energy from sunlight and use it to produce food. "contain clorophil" included in the plant cell
produce proteins, they may be attached to the outer surfaces of the endoplasmic reticulum or they may float free in the cytoplasm. included in the plant and animal cell
carries materials from one part of the cell to another. included in the plant and animal cell
contain chemicals that break down food particles and worn-out cell parts. included in the animal cell.
carries genetic imformation that controls inherited characteristics such as eye color and blood type. included in the animal cell.
directs all of the cell's activities, incluing reproduction. "brain of cell or control center" found in the plant and animal cell.
provides support for your body and connects all its parts. bone is one kind of connective tussue; its strength and hardness support your body and protects its internal structures. fat is also a connective tissue. it pads part of your body, provides insulation from cold, and stores energy.
the body's tendency to keep an internal balance. homeostasis is the process which an organism's internal environment is kept stable in spite of changes in the external environment.
produces the body's blood cells, as a child, most of your bones contained red bone marrow. as a teenager, onle the ends of your femurs, skull, hip bones, and sternum contain red marrow
voluntary muscle-skeletal muscle. it is striated. they are attached to the bones of your skeleton. these muscles provide the force that moves your bones. a tendon is a strong connective tissue that attaches muscle to bone. involuntary muscles- smooth muscle is non-striated. they are found inside many internal organs. they are involved in digestion especially and work slowly, therefore tire more slowly. they produce a churning action. the action mixes food with chemicals produced by your stomach. the cardiac muscle is striated and doesnt get tired.
muscle tissue types
materials are exchanged between the blood and the body's cells. one process in which materials are exchanged between the blood and the body cells is diffusion.
a red blood cell is made mostly of hemoglobin, which is an inro-containing protein that binds chemically to oxygen molecules.
they fight disease. they last for months or even years. they have nuclei. they are bigger than red blood cells. there is about one white blood cell for every 500 to 1000 red blood cells.
white blood cells
pieces of cells. when a blood vessel is cut, platelets collect and stick to the vessel at the site of the wound. the platelets release chemicals that start a chain reaction. this series of reactions eventually produces fibrin. the fiber net traps blood cells. as more and more platelets and blood cells become trapped in the net, a blood clot forms. a scab is a dried bloot clot on the skin surface.
the process in which oxygen and glucose undergo chemical rections inside cells to release energy
the throat. it is the only part of the respiratroy system that is shared with another system--the digestive system.
air enters nose=>into the pharynx=>to the trachea=>into the bronchi=>to the bronchioles=>alveoli
the path of air
a well tested concept that explains a wide range of observations is a scientific theory
the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members is called natural selection
petrified fossils are formed when minerals replace the remains, changing them into rock
the empty space that remains when some hard parts become dissolved. the empty space has the same shape as the organism or part that was buried.
the type of fossil that forms when a mold becomes filled in with minerals that harden. the cast takes on the shape of the mold creating a replica of the organism or part.
formed when a dark sticky form of oil seep up from underground causing animals to get stuck.
insects have been preserved in the sticky sap from evergreen trees. it hardens forming amber with the insect perfectly preserved.
determines actual age. fossil's nearby rock contains radioactive elements that break down (decay) into different elements over time. half life of these elements means the time it takes for half of the atoms to decay. they compare how much of the radioactive element is in the sample and the amount of the enw element, then calculate the age.
one theory that proposes that evolution occurs slowly but steadily. tiny changes in a species gradually add up to major changes over very long periods of time.
overproduction-more offspring are produced than there are resources for. competition-food and resources are limited, offspring must compete with each other--indirectly happens. variations-are any difference between individuals of the same species. ex. newly hatched turtles are able to run faster than other turtles. some variations make certain species better adapted to their environment more likely to survive and reproduce. over time the offspring will inherit the new variation as an allele and future generations will have this "helpful trait". only genes or traits that are inherited can be acted on by natural selection.
3 things that afdfect natural selection
a new species can form when a group of individuals remains separated from the rest of its species long enough to evolve different traits. they can be separated by water, mountains, volcano, or canyons.
how do new species form? how are they separated?
they compare the pattern of the nitrogen bases. the more similar the pattern, the more closely related the organisms are. also, scientists compare the amino acids within the protein of the organisms
name 2 ways that scientists use similarities in DNA to determine how species can be related.
he believed evolution occurs slowly but steadily. tiny changes in a species gradually add up to major changes over very long periods of time.
how did darwin think that evolution occured?
a rod-shaped cellular structure made of condensed chromatin; contains DNA, which carries the genetic information that controls inherited characteristics such as eye color and blood type.
is the process that completes cell division. during cytokinesis, the cytoplasm divides, distributing the organelles into each of the two new cells.
stage 1. the cell grows to its mature size. the cell makes a copy of its DNA. the cell prepares to divide into two cells
stage 2a. the chromatin in the nucleus condenses to form chromosomes. structures called spindle fibers form a bridge between the ends of the cell. the nuclear membrane breaks down/disappear.
stage 2b. the chromosomes line up across the center of the cell. each chromosome attaches to a spindle fiber at its centromere, which still holds the chromatids together.
stage 2c. the centromeres split. the two chromatids separate. one chromatid moves along the spindle fiber to one end of the cell. the other chromatid moves to the opposite end. the cell becomes stretched out as the opposite ends pull apart.
stage 2d the chromosomes begin to stretch out and lose their rodlike appearance. this occurs in the two regions at the ends of the cell. a new nuclear membrane forms around each region of chromosomes.
stage 3. the cell membrane pinches in around the middle of the cell. eventually, the cell pinches in two. each daughter cell ends up with the same number of identical chromosomes and half the organelles and cytoplasm.
theory that species evolve during short periods of rapid change. these periods of rapid change are separated by long periods of little or no change. species evolve quickly when groups become isolated and adapted to new environments.
similar structures that related species have inherited from a common ancestor. ex, ancient whale fossil-had legs to walk on land compared with today's whale shows how humans and whales share a common ancestor.
is a diagram that shows how scientists think different groups of organisms are related.
large organic molecules made of carbon, hydrogen, oxygen, nitrogen, and in some cases, sulfur
building blocks of proteins are amino acids. there are 20 different amino acids. they can be combined in different ways to form thousands of different proteins. the kinds of amino acids and the order in which they link together determines the type of protein
a type of protein. they make chemical reactions occur. the names for them usually end in ase. ex. lactase (breaks down lactose)
contain carbon, hydrogen, and oxygen. the building blocks are 3 fatty acids and 1 glucerol. they include fats, oil and waxes. lipids provide energy and can be stored under the skin of animals. also, part of the cell membrane (structural).
contain carbon, hydrogen, oxygen, nitrogen, and phospherous. they are the building blocks are nucleotides. two kinds of nucleic acids are DNA and RNA.
the process by which molecules move from an area in which they are highly concentrated to an area in which they are less concentrated.
the diffusion of water molecules through a selectively permeable membrane is called osmosis. osmosis is important to cells because cells cannot function properly without adequate water.
the movement of materials through a cell membrane without using energy is called passive transport
first the cell membrane surrounds a particle. once the particle is engulfed, the cell membrane pinches off and forms a vacuole within the cell. the cell must use energy in this process.