Given below are few statements with reference to the ovaries of the human female reproductive system:
(i) It is 2--4 cm in length and is connected to the pelvic wall by tendons.
(ii) It is covered by a thin epithelium which encloses the ovarian stroma.
(iii) The stroma is divided into a peripheral medulla and an inner cortex.
(iv) The ovaries are the primary female sex organs that produce the female gamete (ovum).
(v) Ovaries are located one on each side of the lower abdomen.
Choose the option with all the true statements from the given options:
Student to attempt either option (A) or (B):
(A)
(i) Draw a diagrammatic sectional view of human seminiferous tubule (enlarged) and label the following:
(a) Cell that undergoes spermiogenesis
(b) Cell that nourish male gametes
(c) Cell which undergoes meiosis I and meiosis II.
(ii) State what is seminal plasma. Mention two constituents of seminal plasma. How is it different from semen?
OR
(B)
(i) Mention the event that induces the completion of the meiotic division of the secondary oocyte in humans.
(ii) Trace the journey of the zygote until its implantation inside the uterus.
Student to attempt either option (A) or (B):
(i) Identify ‘P’ and ‘Q’ labelled in the diagram.
(ii) Specify the source of the hormone ‘P’ and ‘Q’ marked in the diagram.
OR
(i) Identify ‘P’ and ‘Q’ labelled in the above diagram.
(ii) Write down the role of hormone ‘P’ in both males and females.
Answer the following questions:
[(i)] Explain why the insecticidal protein produced by Bacillus thuringiensis does not kill the bacteria itself.
[(ii)] How has man exploited this protein to produce cotton bollworm-resistant Bt cotton plant?
[(i)] Identify the selectable markers labelled as ‘a’ and ‘b’ in the given diagram of E. coli vector.
[(ii)] How is the coding sequence of enzyme \(\beta\)-galactosidase considered a better marker than the ones identified by you in the diagram? Explain.
[(iii)] List any two uses of cloning vectors in biotechnology.