Levels of Organization
What is the correct order of levels of organization from smallest to largest?
The order is cell → tissue → organ → organ system → organism.
What is the main job of the circulatory system?
It transports oxygen, nutrients, and wastes.
What is a feedback loop?
It is a system that adjusts the body’s conditions.
What does xylem transport?
Xylem carries water upward in the plant.
What is the main job of the immune system?
It protects the body from pathogens.
What is a tissue?
A tissue is a group of similar cells working together.
What does the digestive system do?
It breaks down food into usable nutrients.
Why is negative feedback important?
It brings the body back to normal when conditions change.
What does phloem transport?
Phloem moves sugars throughout the plant.
How does the skin help defend the body?
It acts as a physical barrier.
Why is the heart considered an organ?
It is made of different tissues working together.
Why is the nervous system important?
It sends signals that control body actions.
How does the body control temperature?
It uses feedback loops like sweating or shivering.
Why is photosynthesis important for plants?
It makes food using sunlight.
Why does inflammation happen?
It increases blood flow to fight infection.
What makes an organ system different from an organ?
An organ system is multiple organs working together.
What happens in the respiratory system?
Oxygen enters and carbon dioxide leaves the body.
How does the body regulate blood sugar?
Insulin lowers it and glucagon raises it.
How do flowering plants reproduce?
They use pollen and seeds to create new plants.
What do white blood cells do?
They attack and destroy harmful invaders.
Why do cells become specialized?
They specialize to perform specific jobs.
How does the muscular system help the body?
It allows movement by contracting muscles.
What is an example of positive feedback?
Blood clotting is an example because it increases the response.
What is a tropism?
A tropism is a plant’s growth response to light, gravity, or touch.
How do vaccines protect the body?
They train the immune system to recognize pathogens.