Scientists hypothesize that the ancestors of plants were. There are two major types of plants; those that lack conducting cells are called and those with conducting cells are called. All plants produce multicellular and exhibit a complex life cycle called.

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Answer 1

Textbook Question

Chapter 21, Problem 1FTB

Scientists hypothesize that the ancestors of plants were. There are two major types of plants; those that lack conducting cells are called and those with conducting cells are called. All plants produce multicellular and exhibit a complex life cycle called.

Expert Solution & Answer

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

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✓ Details Draw a protein that is embedded in a membrane (a transmembrane protein), label the lipid bilayer and the protein. Identify the areas of the lipid bilayer that are hydrophobic and hydrophilic. Draw a membrane with two transporters: a proton pump transporter that uses ATP to generate a proton gradient, and a second transporter that moves glucose by secondary active transport (cartoon-like is ok). It will be important to show protons moving in the correct direction, and that the transporter that is powered by secondary active transport is logically related to the proton pump.

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Answer 2

Textbook Question

Chapter 21, Problem 1FTB

Scientists hypothesize that the ancestors of plants were. There are two major types of plants; those that lack conducting cells are called and those with conducting cells are called. All plants produce multicellular and exhibit a complex life cycle called.

Expert Solution & Answer

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

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Answer 3

Textbook Question

Chapter 21, Problem 1FTB

Scientists hypothesize that the ancestors of plants were. There are two major types of plants; those that lack conducting cells are called and those with conducting cells are called. All plants produce multicellular and exhibit a complex life cycle called.

Expert Solution & Answer

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 21, Problem 1FTB

Scientists hypothesize that the ancestors of plants were. There are two major types of plants; those that lack conducting cells are called and those with conducting cells are called. All plants produce multicellular and exhibit a complex life cycle called.

Expert Solution & Answer

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

Answer 8

Expert Solution & Answer

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

To review:

The given blank space in the statement, “scientists hypothesize that the ancestors of plants were__________. There are two major types of plants; those that lack conducting cells are called __________ and those with conducting cells are called __________. All the plants produce multicellular _________ and exhibit a complex life cycle called ___________.”

Introduction:

A major part of the earth was submerged in the oceans during ancient times. The life is assumed to have evolved under the ocean as that was the only favorable environment for the living organisms. They obtained nutrients from the water and could move freely from one place to another. They also received protection from the harsh terrestrial environment, which frequently oscillated between warm and cold temperature conditions. Similarly, the ancestors of the present-day plants also evolved in the water.

Answer 12

Explanation of Solution

The evolution of plants can be proved from the fact that some plants still grow in the aquatic environment like algae, some bryophytes, and a few pteridophytes. Photosynthetic algae are considered as the ancestors of present-day plants.

The water-dwelling plants lack true roots, stems, leaves, and reproductive structures like fruits and flowers. These plants lack water conduction system like xylem and hence, are called nonvascular plants. Algae and bryophytes fall under this category. The plants that contain a proper conducting system, almost all the terrestrial plants, are called vascular plants or tracheophytes.

A common feature of aquatic and terrestrial plants is that they produce a multicellular-dependent embryo and their haploid gametophyte alternates with diploid sporophyte. The photosynthetic nature and this complex life cycle distinguish them from other organisms.

Answer 13

Conclusion

Scientists hypothesize that the ancestors of plants were green algae. There are two major types of plants; those that lack conducting cells are called nonvascular plants (bryophytes) and those with conducting cells are called vascular plants (tracheophytes). All the plants produce multicellular embryos and exhibit a complex life cycle called alternation of generations.

Answer 14

Ch. 21 - 1. Scientists hypothesize that the ancestors of...Ch. 21 - Plant adaptations to life on land include a(n)...Ch. 21 - 3. Seedless vascular plants must reproduce when...Ch. 21 - 4. Three groups of nonvascular plants are _______,...Ch. 21 - 1. What is meant by “alternation of generations”?...Ch. 21 - 2. Explain the evolutionary changes in plant...Ch. 21 - Describe evolutionary trends in the life cycles of...Ch. 21 - Prob. 4RQ Ch. 21 - List the structural adaptations necessary for the...Ch. 21 - The number of species of flowering plants is...

Scientists hypothesize that the ancestors of plants were. There are two major types of plants; those that lack conducting cells are called and those with conducting cells are called. All plants produce multicellular and exhibit a complex life cycle called.

Solution Summary: The author explains that the ancestors of plants were green algae.

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