Lab 7

Select all examples of a nastic response by a plant.

• The opening of a flower

• Shoot tip growing towards light

• Root tips growing downward

• Leaves quickly closing/changing position in response to touch

What experimental condition was used to disrupt the boundary layer beneath leaves?

• Light

• Wind

• Mist

• Room

Which environmental condition(s) may result in an increase in transpiration?

• High light

• High humidity

• Low light

• High wind

What is the term to describe the water status of a plant?

What is transpiration?

• The same thing as evaporation

• When plants lose water

• The loss of water through leaves

• The loss of water through stomata

Which is/are a component of the RWC formula?

• Dry weight

• Current weight

• Fully hydrated weight

• Soaked weight

Consider the potometer experiment that your lab section conducted last week. In theory, which environmental condition(s) would you expect to have resulted in the greatest increase in transpiration?

• Light

• Light + Wind

• Light + Mist

• Wind

___________ is responsible for the outgrowth of axillary buds when apical dominance is lost.

Which pictured stem was more likely subjected to high light/wind treatment conditions?

• Neither stem

• The stem on the left

• The stem on the right

• How am I supposed to know that?

The _______________ is a layer of still, humid air on the underside of a leaf.