In flowers that are pollinated by wind or water, which of the parts in Question 13 is often missing?

Review Questions 13

Flowers typically have many parts, although some flowers can be missing some of the standard parts. What is the name of each of the following parts:

a. The stalk of the flower

b. The end of the stalk, where the other parts are attached
c. The parts that are usually green and protect the flower bud as it develops
d. The parts that attract pollinators
e. The parts that produce pollen
f. The parts that receive pollen and which contain ovules