Which of the following statements is incorrect for ovary?
I. It is connected to the pelvic wall and the uterus by bones.
II. The ovarian stroma is divided into an outer cortex and an inner medulla.
III. Each ovary is about 2-4 cm in length.
IV. Ovary is covered by a thick, stratified epithelium.
V. Ovary secretes steroid hormones.