7th Grade Science End of Year Test
Quiz by Christy Shelley
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15 questions
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- Q1Both primary and secondary succession begin with pioneer species that _______change the area and make it safer from predatory organismsinvade the area so that new organisms cannot be establishedmodify the area and allow larger and more complex organisms to appearuse up all the existing resources and prevent establishment of non-native organisms300s
- Q2According to cell theory, all cells ________carry out meiosiscontain chloroplasthave a nuclear membranecome from other cells300s
- Q3Which statement below best describes how biodiversity contributes to the sustainability of an ecosystem?Low biodiversity reduces the competition for resources, which helps native species surviveFewer species in the ecosystem reduces the likelihood that disease spreads through the ecosystemHaving more species in an ecosystem allows the human population to increase in size.A variety of plant and animal species allows from more survivors of a natural disaster.300s
- Q4DDT is a pesticide that causes the eggshells of certain birds, like the brown pelican, to become fragile and thin. The adult birds would accidentally crush the eggs while incubating them. What happened to the brown pelican populations as a result of DDT use by humans?The populations increased much more slowlyThe populations remained stable over timeThe populations decreased because fewer birds survived long enough to hatchThe populations increased as pelicans laid more eggs so that more offspring would survive300s
- Q5An energy pyramid is shown. Based on the model, which consumers would receive the greatest amount of energy captured by the producers in their food chains?Eucalyptus treesWedge-tailed eaglesRing-tailed opossumsChuditch300s
- Q6How does the agricultural activity most likely affect the surface water of the area?Crops absorb pure water from the soil, causing the remaining water to contain more salt.Crops reduce erosion, increasing the amount of soil entering the river.Excess crop fertilizer is carried by runoff into the river, causing excess growth of water plants.Excess crop material accumulates on the riverbanks, slowing the movement of the river water.300s
- Q7A student drew the picture of the human body system below. The student labeled some of the organs of the system. The main function of this system is to _________trap particles that enter the noseexchange gases with the environmentchew food as it enters the mouthsense odors in the environment300s
- Q8Many Texas caves provide a habitat for animals. The diagram below shows the relationships of some organisms involved in a cave ecosystem. Based on the diagram, which of the following statements is valid?Owls are predators of bats, and bats are predators of mothsBeetles complete with bats and cave spidersSnakes prey on bats and owlsNone of these300s
- Q9A student listed how different parts of the body work to aid in the digestion of food. Which of the following is a chemical change that occurs to the food?The movement of food to the stomach after food is swallowedThe breakdown of molecules of food by enzymes and acid in the stomachNone of theseThe reduction in size of food particles when food is chewed300s
- Q10If mice were eliminated from this web, which conclusion could you make?Since only mice eat grass, the grass population would increaseThe fox population would increase because of less preyThe hawks would not directly be affected because they don't eat miceThe grasshoppers would decrease due to fewer predators300s
- Q11Part of a human body system is pictured below. The main function of this system is to _______control reproductiontransport oxygenproduce hormonesremove waste300s
- Q12Which sentence best describes how energy flows through this pyramid?Energy is transferred from organisms in one level to those in the level aboveEnergy is transferred down each level of the energy pyramidThe organisms at the bottom level provide energy directly to the organisms in all the other levelsThe energy lost at each level is consumed by the organisms in the top level300s
- Q13The diagram below shows parts of a cell. Which organelle stores the information that determines an individual's blood type?Organelle 4Organelle 2Organelle 1Organelle 3300s
- Q14A group of students prepared a table listing the types of reproduction that occur in several organisms. Based on this information, which of the organisms can produce offspring that are genetically identical to the parent organism?Amoebas and yeasts onlyFerns onlyAmoebas, yeasts, hydras, and ferns onlyCats, hydras, frogs, and ferns only300s
- Q15A partial marine food web is shown below. Green crabs carry a parasitic worm that can infect organisms that prey on the crabs. Which organism is most likely to be infected with this parasite?BarnaclesBlue musselsGullsMarsh periwinkles300s
