Exam 29: The Working Plant

Transpiration pulls water up a plant because of two mechanisms: ________ describes water molecules sticking together and ________ describes water molecules sticking to the walls of the xylem.

Oats are eaten by humans as oatmeal or rolled oats, and as feed for livestock such as cattle. In order for an oat plant to make the part we eat (the seed), it must flower and be pollinated. Typically, oat plants flower when days are lengthening (i.e., late spring to early summer). What is the best classification for oat plants?

A pea tendril contacts a string or wire and coils around it for support. What does this pea tendril demonstrate?

What plant hormone(s)affect(s)development in the plant body?

-In the figure, what produces nitrogen in a form that can be used directly by the plant, without need for conversion?

V -A scientist finds seeds of an unknown plant on top of the soil in a desert. She measures the concentration of two hormones in these seeds. After it rains, she collects more of these seeds, and finds that the concentration of the two hormones has changed. A graph of her results is shown. Identify the most likely hormones measured by the scientist.

What hormone promotes seed germination?

What triggers flowering for plants sensitive to photoperiod?

A ________ is a chemical element that a plant can only obtain from its environment and is needed to complete its life cycle.

Michael Knoblauch and colleagues have developed methods to measure the pressure flow mechanism directly. Where would they measure high pressure vs. low pressure in a tree if the pressure flow mechanism is transporting sugar from leaves to roots?

-Examine the figure. What adds ammonium to the soil by decomposing organic matter?

-What is the difference between the two properties of water shown at label 2 and label 3?

Plant transport products have many economic uses. A product that is correctly paired to its structure in a plant is ________.