Explanation:
Living things respond to changes in their environment. For example, if you touch the leaves of the Mimosa (touch-me-not) plant, the leaves droop. In this case, the plant is responding to the stimulus of touch by drooping its leaves
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Here are some examples of living beings responding to stimuli:
[tex]\bf\ Humans\ [/tex]
When we see delicious food, our mouth waters. When we see something approaching, our eyes close. When we touch a hot object, we move our hands away. Our pupils dilate and constrict to adjust to light. Our bodies sweat to adjust to heat. When we exercise, we breathe deeper to get more oxygen. When it gets too cold, we shiver to increase our body temperature.
[tex]\bf\ Plants\ [/tex]
Plants respond to various stimuli, such as light, water, and gravity. This response is called tropism. For example, sunflowers turn towards the sun, which is called phototropism. Plant roots grow deeper into the soil in response to higher water concentration, which is called hydrotropism. Pollen on stigma grows pollen tubes towards the ovules, which is called chemotropism. Roots grow down in response to gravity, which is called positive geotropism. Plants also respond to touch, such as when the leaves of the Mimosa plant close when someone touches them.
[tex]\bf\ Animals\ [/tex]
Animals may respond to environmental stimuli through behaviors that include hibernation, migration, defense, and courtship. For example, some animals will hibernate as a result of cold, winter weather. Hibernation is a state of greatly reduced body activity, used to conserve food stored in the body.
