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Skills available for Virginia seventh-grade science standards

Standards are in black and IXL science skills are in dark green. Hold your mouse over the name of a skill to view a sample question. Click on the name of a skill to practice that skill.

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LS.1 The student will demonstrate an understanding of scientific reasoning, logic, and the nature of science by planning and conducting investigations in which

  • a data are organized into tables showing repeated trials and means;

  • b a classification system is developed based on multiple attributes;

  • c triple beam and electronic balances, thermometers, metric rulers, graduated cylinders, and probeware are used to gather data;

  • d models and simulations are constructed and used to illustrate and explain phenomena;

  • e sources of experimental error are identified;

  • f dependent variables, independent variables, and constants are identified;

  • g variables are controlled to test hypotheses, and trials are repeated;

  • h data are organized, communicated through graphical representation, interpreted, and used to make predictions;

  • i patterns are identified in data and are interpreted and evaluated; and

  • j current applications are used to reinforce life science concepts.

LS.2 The student will investigate and understand that all living things are composed of cells.

LS.3 The student will investigate and understand that living things show patterns of cellular organization.

  • a cells, tissues, organs, and systems; and

  • b patterns of cellular organization and their relationship to life processes in living things.

LS.4 The student will investigate and understand how organisms can be classified. Key concepts include

  • a the distinguishing characteristics of domains of organisms;

  • b the distinguishing characteristics of kingdoms of organisms;

  • c the distinguishing characteristics of major animal phyla and plant divisions; and

  • d the characteristics that define a species.

LS.5 The student will investigate and understand the basic physical and chemical processes of photosynthesis and its importance to plant and animal life.

  • a energy transfer between sunlight and chlorophyll;

  • b transformation of water and carbon dioxide into sugar and oxygen; and

  • c photosynthesis as the foundation of virtually all food webs.

LS.6 The student will investigate and understand that organisms within an ecosystem are dependent on one another and on nonliving components of the environment.

LS.7 The student will investigate and understand that interactions exist among members of a population.

  • a competition, cooperation, social hierarchy, territorial imperative; and

  • b influence of behavior on a population.

LS.8 The student will investigate and understand interactions among populations in a biological community.

LS.9 The student will investigate and understand how organisms adapt to biotic and abiotic factors in an ecosystem.

LS.10 The student will investigate and understand that ecosystems, communities, populations, and organisms are dynamic, change over time, and respond to daily, seasonal, and long-term changes in their environment.

  • a phototropism, hibernation, and dormancy;

  • b factors that increase or decrease population size; and

  • c eutrophication, climate changes, and catastrophic disturbances.

LS.11 The student will investigate and understand the relationships between ecosystem dynamics and human activity.

  • a food production and harvest;

  • b change in habitat size, quality, or structure;

  • c change in species competition;

  • d population disturbances and factors that threaten or enhance species survival; and

  • e environmental issues.

LS.12 The student will investigate and understand that organisms reproduce and transmit genetic information to new generations.

LS.13 The student will investigate and understand that populations of organisms change over time.

  • a the relationships of mutation, adaptation, natural selection, and extinction;

  • b evidence of evolution of different species in the fossil record; and

  • c how environmental influences, as well as genetic variation, can lead to diversity of organisms.