Question 1

Which of the following hormones increases when plants are flooded?

Accepted Answer

Ethylene is a plant hormone that increases in response to flooding, helping plants adapt to low oxygen conditions by promoting processes like aerenchyma formation and adventitious root growth.

Question 2

Which of the following does not require expenditure of energy?

Accepted Answer

The flow of sucrose and other carbohydrates once inside the sieve tubes occurs through passive transport, which does not require energy.

Question 3

Water molecules can "stick" to certain surfaces by

Accepted Answer

Adhesion is the property that allows water molecules to stick to other surfaces.

Question 4

Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells.

Accepted Answer

Closing the stomata for an extended period of time would lead to a decrease in carbon dioxide availability for photosynthesis and, therefore, a decrease in G3P production in the mesophyll cells.

Question 5

Halophytes are plants that live in saline soils.The high osmotic potential of the salt solution in the soil creates a very negative water potential.What can halophytes do so that water will flow into the roots?

Accepted Answer

Halophytes increase the solute concentration in their roots, making the water potential more negative than the soil, allowing water to flow into the roots.

Question 6

Most carbohydrates manufactured in leaves and other photosynthetic parts are transported through the phloem to the rest of the plant by the process of

Accepted Answer

Carbohydrates are transported through the phloem by the process of translocation.

Question 7

Some plants can tolerate flooding conditions by

Accepted Answer

Aerenchyma is a type of plant tissue that contains large air spaces, which helps the plant to float and tolerate flooding conditions.

Question 8

Which of the following equations represents the total water potential of a plant?

Accepted Answer

The total water potential (ψw) of a plant is the sum of the pressure potential (ψp) and the solute potential (ψs).

Question 9

If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis.

Accepted Answer

The answer of If the soil around a plant is...

Question 10

A large watermelon fruit is very heavy and contains nearly 90% water.Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon.So, how does all that water get into the fruit?

Accepted Answer

The answer of A large watermelon fruit is very heavy...

Question 11

Cavitation would have no effect on translocation.

Accepted Answer

Cavitation can create air pockets in the xylem of plants, which can block water flow and reduce translocation efficiency.

Question 12

In Cell 3,

Accepted Answer

The correct choice is A because it states that the pressure potential (ψp) is 0.0 MPa and the water potential (ψw) is -0.5 MPa, which is a common scenario in plant cells where the pressure potential is zero and the water potential is negative due to solute concentration.

Question 13

Pure water without applied pressure has a water potential that is equal to

Accepted Answer

Water potential is defined as the potential energy of water in a system compared to pure water, where pure water at atmospheric pressure has a water potential of 0.0 MPa.

Question 14

Mycorrhizal fungi interact with plants at the

Accepted Answer

Mycorrhizal fungi form symbiotic relationships with plants primarily at the roots, where they enhance nutrient and water uptake.

Question 15

In Cell 1,

Accepted Answer

The correct choice is C because it provides a balanced scenario where the pressure potential (F1F1F1S1F1F1F10_p) is positive and the water potential (F1F1F1S1F1F1F10_w) is negative, which is a common condition in plant cells where turgor pressure is positive and water potential is negative due to solute concentration.

Question 16

Which of these situations regarding phloem sources and sinks is not correct?

Accepted Answer

The answer of Which of these situations regarding phloem sources...

Question 17

The pressure-flow hypothesis describes

Accepted Answer

The pressure-flow hypothesis explains the movement of carbohydrates in solution through the phloem from sources to sinks in plants.

Question 18

Water may be lost in the form of liquid from the surface of leaves through a process known as

Accepted Answer

Guttation is the process where water is expelled in liquid form from the edges of leaves, typically occurring at night when soil moisture is high and transpiration is low.

Question 19

You a given a plant tissue in lab and asked to determine if the tissue is a source or a sink.Microscopic analysis reveals an abundance of colorless parenchyma cells with plastids.Only one biochemical test reacts positively with your sample.In the presence of iodine, the plastids turn a dark purplish color.Based on this information you determine your sample is

Accepted Answer

The answer of You a given a plant tissue in...

Question 20

The uneven distribution of an impermeable solute on either side of a membrane will result in

Accepted Answer

Osmosis is the movement of water across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration, which occurs when there is an uneven distribution of an impermeable solute.

Quiz 37: Transport in Plants