Body Systems
Which two systems work together when a person eats food and the nutrients are delivered to the cells?
Digestive and circulatory systems; digestive breaks down food, circulatory transports nutrients.
What plant structure helps transport water from roots to leaves?
Xylem
What is the main energy source for photosynthesis?
Sunlight
What is the purpose of the cell cycle in multicellular organisms
To help organisms grow, repair damaged tissues, and replace old cells.
What happens when a cell ignores the signals to stop dividing?
It can keep dividing uncontrollably, leading to tumors.
Explain how the nervous and muscular systems work together to maintain body temperature when it’s cold outside.
The nervous system senses cold and signals muscles to shiver, generating heat.
Explain how the structure of a flower supports reproduction.
Pollen from the anther gets trapped on a stigma, travels down the style into the ovary. Petals attract pollinators
What gas is released during photosynthesis but used in cellular respiration?
Oxygen.
What happens during DNA replication, and why is it important?
DNA is copied so each new cell has an identical set of instructions.
How is cancer related to the cell cycle?
Cancer is caused by disruptions or mutations that cause cells to divide without control.
When a virus enters the body, which systems respond to fight it, and how do they work together?
The immune system fights the virus; the circulatory system transports immune cells.
How do the stem and leaves work together to help the plant respond to light?
The stem supports the leaves, which turn toward light for photosynthesis (phototropism).
What carbon compound is used during cellular respiration that is the stored during photosynthesis?
Glucose
Explain how the structure of DNA allows it to be accurately copied during replication.
The double helix has complementary base pairs (A-T, C-G), allowing each strand to serve as a template.
Explain how a mutation in DNA could lead to a loss of control in the cell cycle.
A mutation might damage a gene that controls the cycle, like a tumor suppressor gene, so the cell no longer responds to stop signals.