Chapter 21, Problem 29A

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

Cones contain male and female reproductive structures of cycads and other gymnosperm plants. According to the evolutionary tree, plants with cones are evolved before plants with flower. A male cone develops pollen grain clouds that contain male gametophytes. Female cones have female gametophytes. Cycad cones can be up to 1 m in length and up to 35 kg in weight. Male and female cones develop in separate cycad plants.

Conclusion

Thus, the word “cone” replaces the word “flower” from the given sentence.