Science Concepts Flashcards

In National External Diploma Program, what is the purpose of the scientific method in science concepts?

Answer: To provide a systematic approach for investigating questions and testing hypotheses

The scientific method provides a structured, systematic approach for asking questions, forming hypotheses, designing experiments, collecting data, and drawing evidence-based conclusions.

What is a controlled variable in an experiment related to National External Diploma Program?

Answer: A factor that is kept constant throughout the experiment

Controlled variables (constants) are factors that are deliberately kept the same throughout an experiment to ensure that any observed changes are due to the independent variable being tested.

Which level of biological organization represents the most complex in National External Diploma Program science concepts?

Answer: Ecosystem

The hierarchy from simplest to most complex goes: atom → molecule → cell → tissue → organ → organ system → organism → population → community → ecosystem → biosphere.

In National External Diploma Program, what is homeostasis?

Answer: The body's ability to maintain a stable internal environment despite external changes

Homeostasis is the process by which biological systems maintain internal stability and balance (temperature, pH, glucose levels, etc.) while adjusting to changing external conditions.

What is the primary function of the mitochondria in cells relevant to National External Diploma Program?

Answer: To produce energy (ATP) through cellular respiration

Mitochondria are the "powerhouses" of the cell, converting nutrients into ATP (adenosine triphosphate) through cellular respiration, providing the energy needed for cellular functions.

In National External Diploma Program, what does pH measure?

Answer: The acidity or alkalinity of a solution on a scale of 0 to 14

pH measures the hydrogen ion concentration in a solution, indicating its acidity (pH 7) on a scale from 0 to 14.