Levels of Organization Quiz
Questions: 16 · 10 minutes
1. What distinguishes an organ system from an individual organ?
An organ system consists of multiple organs coordinating major functions
An organ system is always smaller than a cell
An organ system includes nonliving environmental factors
An organ system contains only one kind of tissue
2. A researcher studies how the heart and blood vessels work together to transport substances through the human body. Which level is the main focus?
Organ
Tissue
Organ system
Population
3. Two hydrogen atoms chemically bonded to one oxygen atom form water. At which level is the resulting unit classified?
Molecule
Atom
Organelle
Cell
4. What is the smallest level generally considered capable of carrying out all basic processes of life?
Organelle
Tissue
Cell
Molecule
5. Draining a wetland changes its water level and soil conditions, which then affects several plant and animal populations. Which level best captures all these interacting changes?
Population
Ecosystem
Organ system
Community
6. All oak trees of the same species living within one forest form which ecological level?
Community
Population
Ecosystem
Biosphere
7. Which level includes every region of Earth where life exists and all of its ecosystems?
Biosphere
Biome
Organism
Community
8. Which sequence correctly moves from a simpler biological level to increasingly complex levels?
Organ → organ system → tissue → organism
Tissue → cell → organ system → organ
Organelle → tissue → cell → organ
Cell → tissue → organ → organ system
9. Which description best defines a tissue?
Several organ systems working together as one living individual
A structure inside a cell that performs a specialized task
A group of similar cells cooperating in a shared function
Populations of different species living in the same area
10. A student must arrange four levels from least complex to most complex. Which arrangement is correct?
Cell → organelle → organ → tissue
Tissue → cell → organelle → organ
Organelle → cell → tissue → organ
Organelle → tissue → cell → organ
11. Under a microscope, a student observes many similar muscle cells arranged together to contract. Which level is being observed?
Organism
Organelle
Organ
Tissue
12. The stomach contains epithelial, muscle, nervous, and connective tissues that work together in digestion. At what level is the stomach classified?
Tissue
Organ
Organ system
Organism
13. A chloroplast carries out photosynthesis within a plant cell. Which level of organization best describes the chloroplast?
Molecule
Organelle
Tissue
Organ
14. Scientists examine desert plants and animals along with soil composition, rainfall, and temperature. Which level are they investigating?
Community
Population
Biosphere
Ecosystem
15. A survey counts frogs, insects, grasses, fungi, and other living species in a pond area, but does not examine water chemistry or temperature. What level does the survey describe?
Population
Organism
Ecosystem
Community
16. A biologist records the body mass, diet, and movement of one deer. Which level of organization is being studied?
Organism
Community
Organ system
Population