Levels of Organization
A scientist looks at a single muscle cell under a microscope. What level of organization is this?
Cell
Which plant structure mainly performs photosynthesis?
Leaf
Which body system removes carbon dioxide from the body?
Respiratory system
Touching a hot pan is an example of what?
Stimulus
Scientists repeat an experiment three times. Why is repetition important?
It helps make results more reliable.
A stomach is made of several tissues working together. What level of organization is the stomach?
Organ
A plant bends toward sunlight over several days. What plant response is being observed?
Response to light
The heart pumps blood carrying oxygen and nutrients. Which body system is mainly responsible.
Circulatory system
Which structure first detects changes in the environment?
Sensory receptor
A scientist changes only the amount of sunlight in an experiment. What type of variable is this?
Independent variable
The circulatory and respiratory system work together to move oxygen through the body. What larger level of organization do they form together (a long with some others working together with them)
Organism
A plant cannot make enough glucose even though it has water and minerals. What resource is most likely missing?
Sunlight
A person begins sweating when body temperature rises. What process is helping maintain a stable internal environment?
Homeostasis
Place these in order: sesnation, sensory neuron, stimulus, sensory receptor
stimulus-sensory receptor-sensory neuron - sensation
Scientists change their ideas after new evidence is discovered. What quality of science does this show?
Scientists use evidence and are open to new ideas.
Put these in order from simplest to most complex. organ, organism, tissue, cell, organ system
cell-tissue-organ-organ system- organism
Roots absorb water and minerals from the soil. Which plant tissue system helps transport these materials through the plant?
Vascular Tissue
Explain how the respiratory and circulatory systems work together.
The respiratory system brings oxygen into the lungs and the circulatory system transports the oxygen through the body.
A mouse smells food before eating it. Why type of receptor detects the smell?
Chemical receptor
A graph shows heart rate rising after a mouse is picked up. What evidence suggests the mouse experienced stress?
The increased heart rate
A group of nerve cells sends electrical signals through the body. Together they form nervous tissue. Which level comes directly after tissue in the organization? What level comes directly before tissue int he organization?
Organ. Cell
Why are stomata important to plant survival?
They allow gas exchange (carbon dioxide in, oxygen out)
If the heart stopped pumping effectively, why would many organ systems be affected?
Cells and organs would not receive enough oxygen and nutrients.
Why might a mouse respond less strongly to being handled after many days of the same experiment?
The mouse may become accustomed to the stimulus. it may learn it's not dangerous
A student concludes that fertilizer caused faster plant growth, but one plant also received extra water. Why is this conclusion weak?
More than one variable changed, so the cause is unclear.