2024 Semester 1 Final P7

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What is a hypothesis?

Back

A hypothesis is a testable statement that predicts the relationship between the independent variable (IV) and the dependent variable (DV). For example, 'If you increase the IV, then the DV will increase.'

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What role do bacteria play in the nitrogen cycle?

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Bacteria are essential organisms in the nitrogen cycle, as they help in processes like nitrogen fixation, nitrification, and denitrification, facilitating the conversion of nitrogen into forms usable by plants.

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What are biomolecules?

Back

Biomolecules are organic molecules that are essential for life, including carbohydrates, lipids, proteins, and nucleic acids. They play critical roles in biological processes.

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What are the three parts of a DNA nucleotide?

Back

The three parts of a DNA nucleotide are a sugar molecule (deoxyribose), a phosphate group, and a nitrogen base (adenine, thymine, cytosine, or guanine).

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What is an observation in scientific research?

Back

An observation is a statement based on what one notices or perceives, often leading to questions or hypotheses. For example, 'I noticed that when I take my vitamins without eating something, I feel sick.'

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What is the independent variable (IV)?

Back

The independent variable (IV) is the factor that is manipulated or changed in an experiment to observe its effect on the dependent variable (DV).

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What is the dependent variable (DV)?

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The dependent variable (DV) is the factor that is measured or observed in an experiment, which is affected by changes in the independent variable (IV).

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What is nitrogen fixation?

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Nitrogen fixation is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) or related compounds in soil, primarily by certain bacteria.

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What is the function of decomposers in the ecosystem?

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Decomposers, such as bacteria and fungi, break down dead organic matter, recycling nutrients back into the ecosystem and aiding in soil health.

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What are carbohydrates?

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Carbohydrates are biomolecules made of carbon, hydrogen, and oxygen, serving as a primary energy source for living organisms. Examples include sugars and starches.