Science Flashcards
6 cards from real NTN practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Science flashcards as text
What is the basic unit of life?
Answer: Cell
The cell is the smallest structural and functional unit of all living organisms.
Which of the following is a function of the human skeletal system?
Answer: Providing structure and protecting internal organs
The skeletal system provides structural support, enables movement, and protects vital organs.
Which element is essential for human red blood cells to carry oxygen?
Answer: Iron
Iron is a key component of hemoglobin, the protein in red blood cells that binds and transports oxygen.
What process do plants use to convert sunlight into food?
Answer: Photosynthesis
Photosynthesis is the process by which plants use sunlight, water, and CO₂ to produce glucose and oxygen.
Which of the following correctly describes the difference between a physical change and a chemical change?
Answer: A chemical change creates a new substance; a physical change does not
A chemical change produces a new substance with different properties, while a physical change alters only form or appearance.
Which body system is primarily responsible for transporting oxygen and nutrients to cells?
Answer: Circulatory system
The circulatory system uses the heart, blood, and vessels to deliver oxygen and nutrients throughout the body.