Multiple choice Which of the following is/are incorrect regarding gymnosperms? They are known as ancestors of flowering plants. Their seeds are enclosed within a fruit. They include usually woody trees. They have unisexual flowers. Pine tree is an example of gymnosperm. Reveal answer Fill a bubble to check yourself B Correct answer Explanation Yes, it is the correct answer. The seeds of angiosperms are enclosed within a fruit, while gymnosperms have naked seeds.