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Statement $I:$ Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.
Statement $II:$ The cavity of the cervix is called cervical canal which along with vagina forms birth canal.
In the light of the above statements, choose the correct answer from the options given below:
$(I)$. Open $N a^{+i i}$ channel
$(II)$. Closed $N a^{+i i}$ channel
$(III)$. Closed $K^{+i i}$ channel
$(IV)$. Open $K^{+i i}$ channel
$(a)$ It results in the formation of haploid gametes
$(b)$ Differentiation of gamete occurs after the completion of meiosis
$(c)$ Meiosis occurs continuously in a mitotically dividing stem cell population
$(d)$ It is controlled by the Luteinising hormone (LH) and FollicleStimulating Hormone (FSH) secreted by the anterior pituitary
$(e)$ It is initiated at puberty
Choose the most appropriate answer from the options given below:
$R$ - The lower the $BOD$ of water, lower is its polluting potentials.
$R$ -The spermatids are transformed into spermatozoa by the process called spermiogenesis.