37. Plant Sensation and Response

Seeds of many desert plants will not germinate until a heavy rain washes away their __________.

The triple response to mechanical stress results in __________.

The abscission layer __________.

In the autumn, the amount of __________ decreases, rendering the cells of the abscission layer more sensitive to __________.

The synthesis and release of abscisic acid in a plant is a response to __________.

Which of these features is/are characteristic of ethylene?

__________ appear to allow a plant cell to sense its orientation with respect to gravity.

A rapid loss of water in specialized cells in the sensitive plant Mimosa pudica causes __________.

The formation of air tubes in submerged roots is an adaptation to __________.

The production of organic solutes by plants is a response to __________.

When a plant that is not adapted to salty water is exposed to salty water, it will __________.