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Statement I states that ovulation is caused by an LH surge leading to the rupture of Graafian follicles. This is biologically accurate. The high concentration of Luteinizing Hormone (LH) in the blood, known as the LH surge, triggers the final maturation of the follicle and its subsequent rupture to release the secondary oocyte.
Statement II states that the remaining Graafian follicle transforms into the corpus luteum and secretes a large amount of estrogen. While it is true that the remaining follicular tissue transforms into the corpus luteum, the primary hormone secreted by the corpus luteum is progesterone, not estrogen. Although it secretes some estrogen, the defining characteristic of the corpus luteum is the secretion of large amounts of progesterone, which is essential for maintaining the endometrium.
Since Statement I is correct and Statement II is incorrect due to the misidentification of the primary hormone, the correct option is (D).
Final Answer: Statement I is correct but Statement II is incorrect