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What is a mechanism that allows heat tolerant species to acclimate to hot temperatures?

A “short day” plant blooms when exposed to the 24-hour light/dark regime illustrated by the top bar in the diagram below.  Select the letter representing any other light/dark regime(s) that would cause this plant to flower.

What is the name of the chemical signal that promotes flowering?

What plant organ detects photoperiod and sends a chemical signal to promote flowering?

This hormone causes stomata to close.

A plant that has been exposed to a chilling period has gone through this process.

This hormone promotes the ripening of climacteric fruit by “turning on” some genes such as the gene for cellulase.

Auxin can be transported through the plant either by polar transport or by the vascular tissue system.  Which of the following statements is true about these methods of auxin transport?

These hormones are synthesized from amino acids.

Inhibitors of this hormone can be used to keep plants short and bushy.