Say whether the stimulus is physical, chemical or biological: (a) The leaves of a touch-me-not…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Say whether the stimulus is physical, chemical or biological:
- (a) The leaves of a touch-me-not plant fold when touched.
- (b) An ant follows a trail of scent to sugar.
- (c) A squirrel runs up a tree when a cat comes near.
- (d) A mosquito flies toward the carbon dioxide breathed out by a person.
- (e) A seed starts to grow when it is watered.
Need a reminder? The key ideaShow
Every organism senses its surroundings and responds to stimuli: physical (light, temperature, touch, water), chemical (smell, taste, pollutants) or biological (other organisms). This is consciousness. Human beings alone are also self-conscious.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
(a) Touch: physical.
(b) A scent: chemical.
(c) A cat, another organism: biological.
(d) Carbon dioxide, a substance: chemical.
(e) Water: physical.
Answer: physical (a) and (e); chemical (b) and (d); biological (c).
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