Question 1

Some scientists predict that the Earth will lose almost all of its topsoil by the middle of the next century.What factors are involved in the erosion of soil?

Accepted Answer

Deforestation, desertification, and poor farming practices all contribute to soil erosion by removing vegetation that protects the soil, degrading the land, and disrupting the soil structure.

Question 2

Analysis of the nutrient content of phloem is performed on phloem sap that is made available when an aphid is cut away from its stylet.

Accepted Answer

Phloem sap can be collected by severing an aphid from its stylet, which remains inserted in the plant, allowing the sap to be extracted for analysis.

Question 3

List the steps associated with the pressure-flow model of phloem transport.

Accepted Answer

1.Sugars are produced in the source (leaves)by photosynthesis. 2.Sugar is actively transported into the sieve tubes. 3.Water moves into the sieve tubes by osmosis. 4.Sugar and water mix to form phloem. 5.Phloem follows positive pressure and moves towards the sink (root system). 6.Sugar is stored in the sink. 7.Cells use the sugar for cellular respiration. 8.Water exits by osmosis and returns to the xylem.

Question 4

Which statement is NOT true about the pressure-flow model of phloem transport?

Accepted Answer

Water is not actively transported into the phloem; it moves passively following the osmotic gradient created by the active transport of sugars.

Question 5

The main components of soil are

Accepted Answer

Soil is composed of a mixture of mineral particles, organic matter, air, and water, making all the options correct.

Question 6

The early experiment by Van Helmont (1600s)describes how he grew a tree in a large pot and found that after five years,the amount of soil in the pot had not changed.He concluded that the increase in weight was due to the addition of water.At that time,the compounds in air had not yet been identified.Today,you know that he only discovered half the story.Which additional experiment would provide evidence for the rest of the story?

Accepted Answer

The answer of The early experiment by Van Helmont (1600s)describes...

Question 7

Which of the following is NOT one of the three most common elements in plants?

Accepted Answer

Sulfur is not one of the three most common elements in plants; the most common are oxygen, carbon, and hydrogen.

Question 8

Which is a correct relationship between soil particles and soil characteristics?

Accepted Answer

Clay particles have a high surface area and can hold water, causing them to clump together.

Question 9

The degree of erosion in the United States is best described by the following statement.

Accepted Answer

Farmland soil is eroding faster than it is being formed, which is a significant concern for sustainable agriculture and environmental health.

Question 10

Which of the following is NOT involved in mineral uptake by plant roots?

Accepted Answer

Cuticles are waxy layers that protect plant surfaces and are not involved in the uptake of minerals by plant roots.

Question 11

Soil formation is due to

Accepted Answer

Soil formation is a complex process that involves the decomposition of organic matter, mechanical weathering of bedrock, and chemical weathering of rock. All these processes contribute to the development of soil.

Question 12

Arrange the soil particles according to size,from largest to smallest: silt,clay,and sand.Briefly describe the content of loam soils in terms of these three particles and tell why loam soils are the most productive.

Accepted Answer

The answer of Arrange the soil particles according to size,from...

Question 13

In the pressure-flow model of phloem transport,the sink is normally

Accepted Answer

In the pressure-flow model, the sink is typically the roots, where sugars are transported from the source (usually leaves) for storage or metabolism.

Question 14

How can researchers confirm that phloem moves from a source to a sink?

Accepted Answer

The answer of How can researchers confirm that phloem moves...

Question 15

Which of the following particles are retained by clay soil and exchanged for hydrogen ions when plants take them up?

Accepted Answer

The answer of Which of the following particles are retained...

Question 16

The coastal wetlands are losing soil at an alarming rate.In Louisiana,it is estimated that 24 mi² of wetlands are lost each year,which equates to one football field every 38 minutes.Why is the loss of these wetlands so critical?

Accepted Answer

The answer of The coastal wetlands are losing soil at...

Question 17

Nitrogen is an essential nutrient for optimal plant growth because it is used to build

Accepted Answer

Nitrogen is an essential nutrient for optimal plant growth because it is used to build nucleic acids, proteins, mitochondria, and DNA.

Question 18

Mature soil generally has three horizons.Label the soil horizons A,B,and C in the following picture.In addition,describe the contents of the horizons by labeling D through G.  D.________
E.________
F.________
G.________

Accepted Answer

The answer of Mature soil generally has three horizons.Label the...

Question 19

List the steps associated with the cohesion-tension model of xylem transport.

Accepted Answer

The answer of List the steps associated with the cohesion-tension...

Question 20

Which of the following conducting cells are associated with xylem?

Accepted Answer

Tracheids and vessel elements are the conducting cells associated with xylem, responsible for water and mineral transport in plants.

Quiz 25: Flowering Plants: Nutrition and Transport

Some scientists predict that the Earth will lose almost all of its topsoil by the middle of the next century.What factors are involved in the erosion of soil?

Analysis of the nutrient content of phloem is performed on phloem sap that is made available when an aphid is cut away from its stylet.

List the steps associated with the pressure-flow model of phloem transport.

Which statement is NOT true about the pressure-flow model of phloem transport?

The main components of soil are

Which of the following is NOT one of the three most common elements in plants?

Which is a correct relationship between soil particles and soil characteristics?

The degree of erosion in the United States is best described by the following statement.

Which of the following is NOT involved in mineral uptake by plant roots?

Soil formation is due to

Arrange the soil particles according to size,from largest to smallest: silt,clay,and sand.Briefly describe the content of loam soils in terms of these three particles and tell why loam soils are the most productive.

In the pressure-flow model of phloem transport,the sink is normally

How can researchers confirm that phloem moves from a source to a sink?

Which of the following particles are retained by clay soil and exchanged for hydrogen ions when plants take them up?

The coastal wetlands are losing soil at an alarming rate.In Louisiana,it is estimated that 24 mi² of wetlands are lost each year,which equates to one football field every 38 minutes.Why is the loss of these wetlands so critical?

Nitrogen is an essential nutrient for optimal plant growth because it is used to build

Mature soil generally has three horizons.Label the soil horizons A,B,and C in the following picture.In addition,describe the contents of the horizons by labeling D through G. D. E. F. G.

List the steps associated with the cohesion-tension model of xylem transport.

Which of the following conducting cells are associated with xylem?

Quiz 25: Flowering Plants: Nutrition and Transport

Some scientists predict that the Earth will lose almost all of its topsoil by the middle of the next century.What factors are involved in the erosion of soil?

Analysis of the nutrient content of phloem is performed on phloem sap that is made available when an aphid is cut away from its stylet.

List the steps associated with the pressure-flow model of phloem transport.

Which statement is NOT true about the pressure-flow model of phloem transport?

The main components of soil are

Which of the following is NOT one of the three most common elements in plants?

Which is a correct relationship between soil particles and soil characteristics?

The degree of erosion in the United States is best described by the following statement.

Which of the following is NOT involved in mineral uptake by plant roots?

Soil formation is due to

Arrange the soil particles according to size,from largest to smallest: silt,clay,and sand.Briefly describe the content of loam soils in terms of these three particles and tell why loam soils are the most productive.

In the pressure-flow model of phloem transport,the sink is normally

How can researchers confirm that phloem moves from a source to a sink?

Which of the following particles are retained by clay soil and exchanged for hydrogen ions when plants take them up?

The coastal wetlands are losing soil at an alarming rate.In Louisiana,it is estimated that 24 mi2 of wetlands are lost each year,which equates to one football field every 38 minutes.Why is the loss of these wetlands so critical?

Nitrogen is an essential nutrient for optimal plant growth because it is used to build

Mature soil generally has three horizons.Label the soil horizons A,B,and C in the following picture.In addition,describe the contents of the horizons by labeling D through G. D.________ E.________ F.________ G.________

List the steps associated with the cohesion-tension model of xylem transport.

Which of the following conducting cells are associated with xylem?

The coastal wetlands are losing soil at an alarming rate.In Louisiana,it is estimated that 24 mi² of wetlands are lost each year,which equates to one football field every 38 minutes.Why is the loss of these wetlands so critical?

Mature soil generally has three horizons.Label the soil horizons A,B,and C in the following picture.In addition,describe the contents of the horizons by labeling D through G. D. E. F. G.