2022 STAAR Test 8th grade science part 1

Front

What is an invasive species?

Back

An invasive species is a non-native organism that spreads widely in a new habitat, often outcompeting native species for resources.

Front

What is the impact of invasive species on native ecosystems?

Back

Invasive species can decrease the population of native species by competing for space, water, and nutrients.

Front

What is the role of fertilizers in agriculture?

Back

Fertilizers provide essential nutrients to crops, but excessive use can lead to water pollution.

Front

How can farmers improve water quality in nearby streams and lakes?

Back

Farmers can improve water quality by planting crops that need less fertilizer, reducing runoff.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties.

Front

Why do sodium and lithium have similar chemical properties?

Back

Sodium and lithium have similar chemical properties because they both have one valence electron.

Front

What is the significance of energy levels in atoms?

Back

Energy levels determine the distribution of electrons in an atom and influence its reactivity.

Front

What is the definition of biodiversity?

Back

Biodiversity refers to the variety of life in a particular habitat or ecosystem.

Front

How does biodiversity affect ecosystem stability?

Back

Higher biodiversity generally leads to greater ecosystem stability and resilience against changes.

Front

What is the water cycle?

Back

The water cycle is the continuous process by which water evaporates, condenses, and precipitates back to the Earth.