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The simplest and most ancient phylum of modern land plants is probably
- a. the
pteridophytes. - b. the cycads.
- c. the liverworts, mosses, or hornworts.
- d. the
angiosperms. - e. none of the above.
Introduction: The angiosperms are known as flowering plants and they also produce seeds. Bryophyta is a phylum which is divided into three divisions, namely the hornworts, liverworts, and the mosses. Pteridophytes are also divided into three divisions and they are the horsetails, ferns, and the lycophytes.
Answer to Problem 1TY
Correct answer: The most ancient and simplest phylum of modern land plants is the liverworts, hornworts, or mosses. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Liverworts, hornworts and mosses do not possess any roots, and they do not have vascular tissues as well. These land plants are very small ancient plants. They are usually found in the moist environment as they lack vascular tissues. They are considered as one of the earliest evolving plants.
Option c. is given as, “the liverworts, mosses, or hornworts”.
Liverworts, hornworts and mosses are the most ancient phylum, and the simplest of the modern land plants. Hence, option c. is correct.
Reasons for incorrect answer:
Option a. is given as, “the pteridophytes”.
Pteridophytes possess vascular tissues xylem and phloem and they are taller than the bryophytes. Therefore, they cannot be considered as simplest plant. Hence, option a. is incorrect.
Option b. is given as, “the cycads”.
The cycads belong to gymnosperms and it is not the simplest modern land plants. Hence, option b. is incorrect.
Option d. is given as, “the angiosperms”.
Angiosperm is the most recently evolved plant and it has a highly developed phylum. They are also known as flowering plant. Hence, option d. is incorrect.
Option e. is given as, “none of the above”.
In all the given option, liverworts, mosses, or hornworts are the simplest and ancient plants. Hence, option e. is incorrect.
Hence, the options a., b., d., and e. are incorrect.
Liverworts, mosses, or hornworts are the simplest and ancient group of modern plants.
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Chapter 31 Solutions
Biology
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