Question 1

If Wents placed his agar blocks only halfway on the cut surfaces of grass shoots with their tips removed,what should he have observed?

Accepted Answer

A) The grass shoot would not grow toward a light. 
B) The grass shoot would grow toward a light when the agar block was on the side of the grass that was facing the light. 
C) The grass shoot would grow toward a light when the agar block was on the side of the grass that was shaded from the light. 
D) The grass shoot would grow toward a light no matter which direction the light was coming from. 
A) The grass shoot would not grow toward a light. 
B) The grass shoot would grow toward a light when the agar block was on the side of the grass that was facing the light. 
C) The grass shoot would grow toward a light when the agar block was on the side of the grass that was shaded from the light. 
D) The grass shoot would grow toward a light no matter which direction the light was coming from. C

Question 2

A location in a plant where sugar is being received for storage or consumption is ________.

Accepted Answer

A) a sugar sink 
B) a sugar source 
C) phloem sap 
D) phloem tube 
A) a sugar sink 
B) a sugar source 
C) phloem sap 
D) phloem tube A

Question 3

Which of the following BEST describes the essential difference between plant and animal nutrition?

Accepted Answer

A) Plants use inorganic substances and energy from the sun to produce their own food. 
B) Plants use organic substances to produce their own food. 
C) Plants absorb food through their roots. 
D) Plant and animal nutrition are essentially the same. 
A) Plants use inorganic substances and energy from the sun to produce their own food. 
B) Plants use organic substances to produce their own food. 
C) Plants absorb food through their roots. 
D) Plant and animal nutrition are essentially the same. A

Question 4

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow).Predict the response of the plants to the addition of the light source.

Accepted Answer

A) Auxin becomes concentrated on the lighted side of the plants,and the plants begin to grow toward the light. 
B) Auxin becomes concentrated on the darker side of the plants,and the plants begin to grow toward the light. 
C) Auxin becomes concentrated on the lighted side of the plants,and the plants begin to grow away from the light. 
D) Auxin becomes concentrated on the darker side of the plants,and the plants begin to grow away from the light. 
A) Auxin becomes concentrated on the lighted side of the plants,and the plants begin to grow toward the light. 
B) Auxin becomes concentrated on the darker side of the plants,and the plants begin to grow toward the light. 
C) Auxin becomes concentrated on the lighted side of the plants,and the plants begin to grow away from the light. 
D) Auxin becomes concentrated on the darker side of the plants,and the plants begin to grow away from the light.

Question 5

Which of the following best describes the mechanism that causes stomata to open?

Accepted Answer

A) Water accumulates below the opening and eventually causes the stoma to open. 
B) A large bubble of oxygen accumulates below the stoma and eventually causes it to open. 
C) Two guard cells flanking each stoma control its opening by changing shape. 
D) The internal pressure of xylem sap expands the leaf,stretching the stoma open. 
A) Water accumulates below the opening and eventually causes the stoma to open. 
B) A large bubble of oxygen accumulates below the stoma and eventually causes it to open. 
C) Two guard cells flanking each stoma control its opening by changing shape. 
D) The internal pressure of xylem sap expands the leaf,stretching the stoma open.

Question 6

What does a plant gain from a mycorrhizal relationship?

Accepted Answer

A) It allows roots to absorb water and solutes more rapidly. 
B) It increases the surface area for photosynthesis. 
C) It helps to break down complex molecules in the soil to release micronutrients. 
D) It helps to break down decaying organic matter into essential plant nutrients. 
A) It allows roots to absorb water and solutes more rapidly. 
B) It increases the surface area for photosynthesis. 
C) It helps to break down complex molecules in the soil to release micronutrients. 
D) It helps to break down decaying organic matter into essential plant nutrients.

Question 7

Which of the following is exemplified by a pea tendril contacting a string or wire and coiling around it for support?

Accepted Answer

A) gravitropism 
B) photoperiod 
C) thigmotropism 
D) phototropism 
A) gravitropism 
B) photoperiod 
C) thigmotropism 
D) phototropism

Question 8

Which of the following best describe(s)the dependencies of most flowering plants? I)Many depend on insects or other animals for pollination.
II)Many depend on insects or other animals for seed dispersal.
III)Many depend on fungi to help them acquire nutrients.

Accepted Answer

A) I 
B) II 
C) I and III 
D) I,II,and III 
A) I 
B) II 
C) I and III 
D) I,II,and III

Question 9

Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?

Accepted Answer

A) cohesion-tension hypothesis 
B) gravitropism 
C) phototropism 
D) expenditure of ATP 
A) cohesion-tension hypothesis 
B) gravitropism 
C) phototropism 
D) expenditure of ATP

Question 10

Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms.Which of the following responses would you most expect to be lacking from these plants?

Accepted Answer

A) gravitropism 
B) photoperiod 
C) thigmotropism 
D) phototropism 
A) gravitropism 
B) photoperiod 
C) thigmotropism 
D) phototropism

Question 11

Which of the following weather conditions would cause transpiration to be most rapid?

Accepted Answer

A) hot,humid weather 
B) cold,humid weather 
C) hot,dry weather 
D) windy,wet weather 
A) hot,humid weather 
B) cold,humid weather 
C) hot,dry weather 
D) windy,wet weather

Question 12

The figure below shows plants grown in the dark,and illustrates ________ in plants.

Accepted Answer

A) photoperiod 
B) gravitropism 
C) thigmotropism 
D) phototropism 
A) photoperiod 
B) gravitropism 
C) thigmotropism 
D) phototropism

Question 13

Which of the following best describes night-neutral plants?

Accepted Answer

A) The plants flower at night. 
B) Plants tend to flower when nights become longer. 
C) Plants tend to flower when nights become shorter. 
D) The flowering in these plants is not affected by photoperiod. 
A) The plants flower at night. 
B) Plants tend to flower when nights become longer. 
C) Plants tend to flower when nights become shorter. 
D) The flowering in these plants is not affected by photoperiod.

Question 14

Which of the following best describes the conversion that occurs during nitrogen fixation?

Accepted Answer

A) ammonium to nitrate 
B) nitrate to ammonium 
C) nitrogen to ammonium 
D) nitrogen to ammonium or nitrate 
A) ammonium to nitrate 
B) nitrate to ammonium 
C) nitrogen to ammonium 
D) nitrogen to ammonium or nitrate

Question 15

A farmer decides she wants to grow certified organic corn and sets out to meet all USDA standards to do so.Her crop grows well for the first 3 years; however,she notices during the 4th and 5th years that plants are getting smaller and producing much less corn.She has not altered farming practices and begins to wonder what is happening.She remembers someone mentioning planting peanuts every 3rd year in place of a corn crop,which leads to much healthier corn.Why would a farmer want to change to a different crop,especially something like peanuts?

Accepted Answer

A) Planting a legume like peanuts increases water retention in the soil,allowing the following year's corn crop to thrive. 
B) Crop rotation with a legume like peanuts will increase nitrogen in the soil,reducing the need for chemical fertilizer. 
C) Planting a legume like peanuts increases the available carbon in the soil. 
D) Changing from corn to peanuts,a legume,allows the soil to "rest" for a year. 
A) Planting a legume like peanuts increases water retention in the soil,allowing the following year's corn crop to thrive. 
B) Crop rotation with a legume like peanuts will increase nitrogen in the soil,reducing the need for chemical fertilizer. 
C) Planting a legume like peanuts increases the available carbon in the soil. 
D) Changing from corn to peanuts,a legume,allows the soil to "rest" for a year.

Question 16

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 above.If the scientist returns to the desert to collect more seeds,a few days later,what should she observe?

Accepted Answer

A) The seeds that are still in the desert will be dormant. 
B) The seeds that are still in the desert will be germinating. 
C) The seeds that are still in the desert will be dead. 
D) The seeds that are still in the desert will have increased levels of hormones 1 and 2. 
A) The seeds that are still in the desert will be dormant. 
B) The seeds that are still in the desert will be germinating. 
C) The seeds that are still in the desert will be dead. 
D) The seeds that are still in the desert will have increased levels of hormones 1 and 2.

Question 17

Trace the flow of a water molecule that is used during photosynthesis.

Accepted Answer

A) stoma → xylem → root hair → mycorrhiza 
B) soil → root hair → xylem → stoma → atmosphere 
C) soil → root hair → xylem → leaf cell 
D) soil → xylem → leaf cell → atmosphere 
A) stoma → xylem → root hair → mycorrhiza 
B) soil → root hair → xylem → stoma → atmosphere 
C) soil → root hair → xylem → leaf cell 
D) soil → xylem → leaf cell → atmosphere

Question 18

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

Accepted Answer

A) high… high 
B) high… low 
C) low… low 
D) low… high 
A) high… high 
B) high… low 
C) low… low 
D) low… high

Question 19

Which of the following explains how phloem sap moves within a plant?

Accepted Answer

A) cohesion-tension mechanism 
B) gravity pulls the phloem sap down 
C) pressure-flow mechanism 
D) transpiration 
A) cohesion-tension mechanism 
B) gravity pulls the phloem sap down 
C) pressure-flow mechanism 
D) transpiration

Question 20

If Paal grew his plants using a light source that was directly overhead,what should he have observed?

Accepted Answer

A) The grass shoot would not grow. 
B) The grass shoot would grow upward and straight. 
C) The grass shoot would grow in the opposite direction from the side with the tip covering the cut surface. 
D) The grass shoot would grow in the same direction as the side with the tip covering the cut surface. 
A) The grass shoot would not grow. 
B) The grass shoot would grow upward and straight. 
C) The grass shoot would grow in the opposite direction from the side with the tip covering the cut surface. 
D) The grass shoot would grow in the same direction as the side with the tip covering the cut surface.

Exam 29: The Working Plant

If Wents placed his agar blocks only halfway on the cut surfaces of grass shoots with their tips removed,what should he have observed?

A location in a plant where sugar is being received for storage or consumption is ________.

Which of the following BEST describes the essential difference between plant and animal nutrition?

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow).Predict the response of the plants to the addition of the light source.

Which of the following best describes the mechanism that causes stomata to open?

What does a plant gain from a mycorrhizal relationship?

Which of the following is exemplified by a pea tendril contacting a string or wire and coiling around it for support?

Which of the following best describe(s)the dependencies of most flowering plants? I)Many depend on insects or other animals for pollination. II)Many depend on insects or other animals for seed dispersal. III)Many depend on fungi to help them acquire nutrients.

Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?

Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms.Which of the following responses would you most expect to be lacking from these plants?

Which of the following weather conditions would cause transpiration to be most rapid?

The figure below shows plants grown in the dark,and illustrates ________ in plants.

Which of the following best describes night-neutral plants?

Which of the following best describes the conversion that occurs during nitrogen fixation?

Trace the flow of a water molecule that is used during photosynthesis.

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

Which of the following explains how phloem sap moves within a plant?

If Paal grew his plants using a light source that was directly overhead,what should he have observed?

Introduction: Biology Today

Essential Chemistry for Biology

The Molecules of Life

A Tour of the Cell

The Working Cell

Cellular Respiration: Obtaining Energy From Food

Photosynthesis: Using Light to Make Food

Cellular Reproduction: Cells From Cells

Patterns of Inheritance

The Structure and Function of Dna

How Genes Are Controlled

DNA Technology

How Populations Evolve

How Biological Diversity Evolves

The Evolution of Microbial Life

The Evolution of Plants and Fungi

The Evolution of Animals

An Introduction to Ecology and the Biosphere

Population Ecology

Communities and Ecosystems

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Circulation and Respiration

The Bodys Defenses

Hormones

Reproduction and Development

Nervous,Sensory,and Locomotor Systems

The Life of a Flowering Plant

Filters

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ,and near root storage cells.