Test Practice

Front

What is the phosphorus cycle?

Back

The phosphorus cycle is the process by which phosphorus moves through the lithosphere, hydrosphere, and biosphere. It involves the weathering of rocks, absorption by plants, and return to the soil and rocks over time.

Front

Why do living organisms need phosphorus?

Back

Living organisms need phosphorus for the formation of DNA, RNA, and ATP, which are essential for energy transfer and genetic information.

Front

What are legumes?

Back

Legumes are plants that have nitrogen-fixing bacteria in nodules on their roots, allowing them to convert atmospheric nitrogen into a form usable by plants.

Front

What process removes carbon from the atmosphere?

Back

Photosynthesis removes carbon from the atmosphere by converting carbon dioxide into glucose using sunlight.

Front

What do plants need to make their own food?

Back

Plants need water, sunlight, and carbon dioxide to make their own food through the process of photosynthesis.

Front

How do plants absorb nitrogen?

Back

Plants absorb nitrogen through their roots from the soil or water in which they live.

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of chlorophyll, converting carbon dioxide and water into glucose and oxygen.

Front

What role do decomposers play in the nutrient cycle?

Back

Decomposers break down dead organic matter, returning nutrients to the soil and making them available for plants.

Front

What is the significance of nitrogen-fixing bacteria?

Back

Nitrogen-fixing bacteria convert atmospheric nitrogen into ammonia, which can be used by plants to synthesize proteins.

Front

What is the difference between biotic and abiotic factors?

Back

Biotic factors are living components of an ecosystem (like plants and animals), while abiotic factors are non-living components (like water, sunlight, and minerals).