On hot, dry days, guard cells often close microscope openings in plant leaves, conserving water. This is an example of

1: Environment factors causing gene mutation in plants.

2: Finite resources acting as selecting agents for evolution.

3: A feedback mechanism for maintaing homeostasis.

4: Differentiation in plants as a result of stimuli.

1.It is basically an adaptation but this has changed the gene pool of desert plants or xerophytes.
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sorry i was taking about desert plants for a normal plant this is an acquired gene.
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3. A feedback mecanism for maintaining hemeostasis
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This helped alot to me....thanx
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