The diagram below illustrates the release of chemical A from a human cell in response to a specific stimulus. Stimulus Human cell Chemical A Source: Biology 8th ed.., Pearson 2008, p. 859. Which cell structure plays a direct role in the release of this chemical from the cell? (1) nucleus (2) ribosome (3) chloroplast (4) cell membrane

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Plant sensory system

The plant sensory system is a sophisticated system that responds to environmental stimuli such as light,temperature, gravity, and touch. Research predicts that plant hormones and signaling mechanisms areresponsible for this regulation system in plants.