To determine the truthfulness of the provided statements, let's examine each one individually:
Statement I: Vas deferens receives a duct from the seminal vesicle and opens into the urethra as the ejaculatory duct.
This statement is indeed correct. In the male reproductive system, the vas deferens is a tube that carries sperm from the epididymis to the ejaculatory ducts. Along this path, it receives secretions from the seminal vesicle. The point where the vas deferens and the duct from the seminal vesicle merge forms the ejaculatory duct, which opens into the urethra.
Statement II: The cavity of the cervix is called the cervical canal, which along with the vagina, forms the birth canal.
This statement is also correct. In the female reproductive system, the cervical canal is the narrow passage through the cervix, which connects the uterine cavity with the vagina. During childbirth, the cervical canal and vagina collectively form the birth canal through which the baby passes.
Based on this analysis, both statements are accurate, making the correct answer: Both Statement I and Statement II are true.
The correct option is (D): Both Statement I and Statement II are true
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is : 
AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is: