Standards with the same topic and subject but for other grades
Organisms may exist as members of a population; populations interact and are interdependent with other populations in a community (LS.6 a).
To survive, plants require light and water for photosynthesis. Plants have developed responses, called tropisms, to help ensure they grow toward adequate sources of light and water (i.e., phototropism and geotropism) (LS.8 a).
A circadian rhythm is a roughly 24-hour cycle in the physiological processes of living things, including plants, animals, fungi, and cyanobacteria. This cycle aids life processes (LS.8 a).
Factors can positively and negatively affect the cycles of matter and the life processes of living things within an ecosystem. Disruptions to any component of an ecosystem can lead to shifts in the size and/or distribution of its populations (LS.8 b).
When excess nutrients flow into an aquatic ecosystem, a chain of events may take place which leads to a low dissolved-oxygen level in the water. This is called eutrophication (LS.8 c).
Human input can disturb the balance of populations in a habitat. These disturbances may lead to a decrease or increase in a population’s size. Since populations in an ecosystem are interdependent, these disturbances can have a ripple effect throughout the larger ecosystem (LS.8 a, b).
The interaction between a consumer that captures and consumes another consumer is the predator-prey relationship (LS.6 a).
Changes in the living and nonliving components of an ecosystem can accelerate or decelerate natural processes (LS.8 b).
Organisms or populations that rely on each other for basic needs form interdependent communities, where a change in the population of one organism will affect the survival of others (LS.6 b).
Many animals exhibit social behaviors that help them obtain resources. Herbivores often exhibit herding behaviors, which can protect the group from predators. Predators often work together to hunt, capture, and share their prey as well as to raise offspring (LS.6 a).