Chapter 37 Transport in Plants - Connect Assignment Questions Dr. Mosley

Order the following from lowest to highest lower water potential.

1. atmosphere 2. leaves and stems 3. roots 4. soil

What type of light induces stomata to open as sunlight increases the need for evaporative cooling?

Blue

Select all factors that lower the water potential of the soil

Drought conditions Excess fertilizer

Sucrose is an important compound in plants for which reason?

It is the transport form of carbohydrates

Select all true statements about transpiration

It pulls water upward from roots to leaves. It is the most important force that helps move water across long distances in plants.

Select all functions of stomata

Minimize water loss Admit carbon dioxide CO2

Select all places where aquaporins are found

Plasma membrane Vacuolar membrane

Choose all components of water potential of a solution in a plant cell

Pressure Gravity Solute concentration

Place the following plant structures in the correct order based on water moves through the plant starting with the entry of water into a plant at the top.

Root Xylem Leaves Stomata

Choose all that contribute to the surface area through which a plant can absorb water.

Root hairs Mycorrhizae

Order the steps that lead to early morning guttation, beginning with the first step at the top

Root xylem accumulates high concentrations of ions. Water follows the ions into the interior of the root. Water is pushed upward in the xylem. Droplets of water are observed on leaves.

Which of the following statements accurately describe the relationship between CO2 concentration and stomatal opening?

Stomata may close when CO2 concentrations are high

Which of the following accurately describes how sucrose moves in the phloem?

Sucrose can move both up and down a plant

What features of guard cells allows them to open stomata when turgor pressure in them changes?

Their cells are thicker on the inside and thinner elsewhere

Select all cell types that typically carry minerals via bulk transport upwards in a plant.

Tracheids Vessel elements

Which of the following accurately compares root pressure and transpiration as forces that move water from roots to leaves in the xylem?

Transpiration is the main force; root pressure alone cannot typically move water to leaves.

Solutions that are not bounded by a cell wall or cell membrane have

a pressure potential of 0

Transpiration rates may be slowed down due to the closing of stomata when

atmospheric CO2 concentrations are high

The plant homrone that regulates stomatal opening in response to drought is (BLANK) acid

abscisic

Select the two processes that allow transpiration to pull water molecules up a plant.

adhesion and cohesion

Caviation in the xylem water column results from which of the following?

air bubbles

The transpiration rate of a plant increases when

air humidity decreases

In contrast to the symplast, the (BLANK) is composed of cell walls and intercellular spaces

apoplast

The bulk flow of water across membranes is faster than predicted by osmosis alone because water can move through specialized channels called

aquaporins

Turgor pressure requires

cell walls to constrain the expansion of cells as they take up water.

What root structure acts a molecular filter, controlling the passage of solutes that have entered through the symplast?

endodermis

In a typical terrestrial plant, water is absorbed mostly in the zone of the root that has root (BLANK)

hairs

Guard cells open when their solute concentrations

increase

The transport mechanism within the circle is (BLANK) channel transport

ion

Choose all materials that are transported in the phloem

ions amino acids sucrose plant hormones

Select all true statements about osmosis

it requires a membrane it involves the movement of water molecules

The water potential of a solution has two components: (BLANK) forces, such as pressure or gravity, and the concentration of (BLANK) in the solution.

physical solutes

if a cell loses water, the cell membrane pulls away from the wall in a process called (BLANK).

plasmolysis

The accumulation of ions in roots results in the creation of root (BLANK)

pressure

The model for phloem transport is called the (BLANK)-(BLANK) hypothesis

pressure-flow

Carbohydrates in the phloem move from source to

sink

The total water potential of a cell is obtained by adding the pressure potential and (BLANK) potential

solute

In early spring, as the buds of a tree are just beginning to open, the main source and sink of sugars in the phloem are which of the following?

source - roots sink - buds

CAM plants save water by opening (BLANK) at night

stomata

In most terrestrial plants, water enters through the roots and exits the plant through the

stomata

Under mild drought conditions, plants may be stunted because

stomata are closed so carbon dioxide is not taken in for photosynthesis

Plant sap is rich in

sucrose

Water molecules form hydrogen bonds with one another so they are difficult to pull apart. Consequently, water is said to have a high (BLANK) strength.

tensile

The current explanation for the movement of water through the xylem is called the cohesion-(BLANK) theory.

tension

Root pressure is present even when transpiration is low, due to

the continued accumulation of ions in the roots

The active uptake of ions into root cells results in

their turgor pressure increasing

Carbohydrates manufactured in leaves are distributed throughout the plant through the phloem. This process is also known as

translocation

This type of evaporation drives water movement through the xylem

transpiration

Water is pulled through the xylem by the process of

transpiration

True or false: sucrose can be transported in the phloem both up and down the plant

true

A cell that is swollen with water is said to be

turgid

Phloem transport is driven by differences in (BLANK) pressure

turgor

Stomata open when the (BLANK) pressure in guard cells increase

turgor

The Greek letter psi is an abbreviation for (BLANK) potential, which predicts the direction of water movement in a plant.

water

When stomata are open and the atmospheric humidity is low, (BLANK) vapor exits the plant

water

Evaporation of water in a leaf creates negative pressure in the xylem. This causes

water to be pulled up the stem from the roots

Transpiration aids in the movement of (BLANK) and dissolved (BLANK) over long distances in plants

water; minerals

The solute potential of pure water is

zero