The vitamin that is required for the synthesis of melanin is: MCQ with Answer and Explanation

Explanation:
Luteinizing Hormone (LH) is a gonadotropin secreted by the gonadotroph cells of the anterior pituitary. In females, during the late follicular phase, rising estrogen levels exert positive feedback on the pituitary, causing a massive, sudden surge of LH (the LH surge). This surge directly triggers ovulation (the rupture of the mature Graafian follicle and release of the secondary oocyte) and subsequently stimulates the remaining follicular cells to transform into the corpus luteum, which secretes progesterone.

Explanation:
Acromegaly results from overproduction of growth hormone after the epiphyseal plates have fused, causing enlargement of hands, feet, jaw, and facial features. Gigantism occurs when excess GH is produced during childhood, leading to tall stature. Dwarfism is GH deficiency, cretinism is congenital hypothyroidism.

Explanation:
The pyramid of energy shows the flow of energy at successive trophic levels. Energy decreases as it moves up (about 10% transfer), so the pyramid is always upright. Pyramids of number and biomass may be inverted in some ecosystems (e.g., parasitic food chains, pond ecosystem), but the energy pyramid never is, according to the second law of thermodynamics.