To solve this problem, we need to identify which effects are not associated with Parathyroid hormone (PTH). Let's analyze each option:$\newline \bullet$(a) Stimulates the process of bone resorption:$\newline$ - PTH increases bone resorption, releasing calcium into the blood.$\newline$ - This is an effect of PTH.$\newline \bullet$(b) Decreases Ca²⁺ level in blood:$\newline$ - PTH actually increases the calcium level in the blood by stimulating bone resorption and increasing renal reabsorption of calcium.$\newline$ - This is not an effect of PTH.$\newline \bullet$(c) Reabsorption of Ca²⁺ by renal tubules:$\newline$ - PTH promotes the reabsorption of calcium in the kidneys, reducing its excretion.$\newline$ - This is an effect of PTH.$\newline \bullet$(d) Decreases the absorption of Ca²⁺ from digested food:$\newline$ - PTH increases the absorption of calcium from the intestine indirectly by stimulating the production of active vitamin D.$\newline$ - This is not an effect of PTH.$\newline \bullet$(e) Increases metabolism of carbohydrates:$\newline$ - PTH primarily regulates calcium and phosphate metabolism, not carbohydrate metabolism.$\newline$ - This is not an effect of PTH.$\newline$Now, let's identify the options that are not effects of PTH:$\newline$(b) Decreases Ca²⁺ level in blood, (d) Decreases the absorption of Ca²⁺ from digested food, and (e) Increases metabolism of carbohydrates are not effects of PTH.$\newline$Therefore, the correct answer is Option 2: (b), (d), and (e) only.