A Brief Overview

of

7^th Grade Science

Cell Biology

• All living organisms are composed of cells, from just one to many trillions, whose details usually are visible only through a microscope.
• Know the difference between animal and plant cells.
• Know that the nucleus is the repository for genetic information in plant and animal cells.
• Know that cells divide to increase their numbers through a process of mitosis.

Genetics

• A typical cell of any organism contains genetic instructions that specify its traits. Those traits may be modified by environmental influences.
• Know the differences between the life cycles and reproduction methods of sexual and asexual organisms.
• Know one or more genes can determine an inherited trait.
• DNA is the genetic material of living organisms.

Evolution

• Biological evolution accounts for the diversity of species developed through gradual processes over many generations.
• Genetic variation and environmental factors are causes of evolution and diversity of organisms.
• Extinction of a species occurs when the environment changes and that the adaptive characteristics of a species are insufficient for its survival.

Earth and Life History

• Evidence from rocks allows us to understand the evolution of life on Earth.
• Earth processes today re similar to those that occurred in the past and slow geologic processes have large cumulative effects over long periods of time.
• Major catastrophic events have disrupted the history of life on Earth.
• The rock cycle includes the formation of new sediment and rocks and that rocks are often found in layers with the oldest generally on the bottom.
• Fossils provide evidence of how life and environmental conditions have changed.

Structure and Function in Living Systems

• The anatomy and physiology of plants and animals illustrate the complementary nature of structure and function.
• Organ system function because of the contributions of individual organs, tissues and cells.
• Bones and muscles work together to provide a structural framework for movement.

Physical Principles in Living Systems

• Physical principles underlie biological structures and functions.
• Know the properties of light.
• Compare joints in the body to simple machines.

Investigation and Experimentation

• Science Fair Project!
• Develop a testable question.
• Develop a hypothesis.