True or false florists will often spray plants with ethylene gas to cause buds to open.

Ethylene is a natural plant growth hormone and is naturally produced by plants but florists use ethylene gas to spray on plants and flowers to speed up the growth process to enhance their sale. It stimulates the opening of buds which grow into young plants at a faster than a normal rate.

Ethylene gas is also used to spray on fruits and vegetables to quick their ripening and also enhance flavor and color.  

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explanation:

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.