Analysis of statements regarding patterns of biodiversity:

• Statement (A) is incorrect: In general, species diversity decreases (not increases) as we move away from the equator towards the poles.
• Statement (B) is correct: The largely tropical Amazonian rain forest in South America has the greatest biodiversity on Earth.
• Statement (C) is incorrect: More solar energy is available in the tropics than in temperate zones, contributing to higher productivity.
• Statement (D) is correct: Tropical environments are less seasonal, relatively more constant, and predictable, which promotes niche specialization and greater species diversity.
• Statement (E) is incorrect: Humboldt observed that within a region, species richness increases (not decreases) with increasing explored area, up to a limit.

Morphologically and biologically, a flower is a modified shoot (determinate reproductive shoot) where the shoot apical meristem transforms into a floral meristem. The internodes do not elongate and the axis gets condensed, bearing floral appendages laterally at successive nodes.

The human placenta functions as a temporary endocrine gland producing hormones such as:

• Human chorionic gonadotropin (hCG)
• Human placental lactogen (hPL)
• Estrogens and Progestogens
• Relaxin (secreted in later stages)
  
  Androgens (male sex hormones like testosterone) are produced by the Leydig cells of the testes and adrenal cortex, not by the placenta.

Klinefelter's Syndrome is caused due to the presence of an additional copy of an X-chromosome resulting into a karyotype of 47, XXY ($44 + \text{XXY}$). Such an individual has overall masculine development, however, the feminine development (development of breast, i.e., Gynaecomastia) is also expressed. Such individuals are sterile.

In the lac operon of E. coli, the structural gene $z$ codes for beta-galactosidase ($\beta$-gal), which is primarily responsible for the hydrolysis of the disaccharide lactose into its monomeric units galactose and glucose.

Gene $y$ codes for permease, and gene $a$ codes for transacetylase.