Chapter 21, Problem 27A

Summary Introduction

To write:

The correct vocabulary term of underlined word in the given sentence.

Introduction:

The vascular seed plant comprises over 250000 vascular plants. Development of seed habit made the seed plants independent of the requirement of external sources of water at the time of fertilization.

Explanation of Solution

Vascular seed plants produce seeds. Each seed generally contains a tiny sporophytes surrounded or covered by protective tissue. Seeds have one or more cotyledons. Cotyledons are the structures that either store food or help absorb food for the tiny sporophyte. The cotyledon of a seed provides nutrients when it sprouts.

Conclusion

Thus, the word “cotyledon” replaces the word “root” from the given sentence.