______________ refers to a change in the environment that causes a response or reaction in a plant., Tuber, Tropism, Stimulus, Saprophyte, Which stimulus causes a porcupine to extend its quills?, Lunar effect on Earth., seasonal temperature changes., threatening behavior by predators., environmental encroachment by humans., A fever is a response to a disease-causing agent infecting the body. Raising one’s body temperature changes the shape of enzymes in the agent so it cannot reproduce. Which statement best describes a fever?, A fever is an internal response to an external stimulus., A fever is an internal response to an internal stimulus., A fever is an external response to an external stimulus., A fever is an external response to an internal stimulus., When a dog smells food and begins drooling, it is responding to an external stimulus. Which of these describes a response to an internal stimulus?, A cat sees a mouse and crouches., A parrot hears a name and repeats it., A person eats spoiled food and vomits., A worm senses water and moves to the surface., Animals respond to environmental stimuli obtained through their sensory organs. How does the body convert information from the environment to an internal response?, increased cellular temperature, selective membrane transport, chemical signaling, osmotic pressure, In the image above, what is the stimulus?, the plant bending towards the light., the light source, A student practicing for the outdoor track team begins to sweat. To what stimulus is the body responding?, An increase in heart rate., An increase in body temperature, An increase in oxygen demand., An increase in breathing rate., Which factor will prompt an animal’s fight-or-flight response?, Population size, Competition for food, Seasonal temperatures., Protection of the environment, The production of sweat is typically a response to an increase in the body’s, Blood circulation., Temperature., Respiration., Heart rate., Which is a response of the nervous system that helps maintain homeostasis in the body?, Shivering in cold temperatures., Eating due to appetite., Slapping at biting insects, Pulling away from hot objects.

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