To solve this problem, we need to analyze each statement and determine which one is not true. Let's evaluate each option:$\newline \bullet$Option 1: Pollen grains are rich in nutrients, and they are used in the form of tablets and syrups.$\newline$ - Pollen grains are indeed rich in proteins, vitamins, and minerals, and are sometimes used as dietary supplements.$\newline$ - Therefore, this statement is true.$\newline \bullet$Option 2: Pollen grains of some plants cause severe allergies and bronchial afflictions in some people.$\newline$ - Pollen grains are known to be allergens for many people, causing conditions like hay fever and asthma.$\newline$ - Therefore, this statement is true.$\newline \bullet$Option 3: The flowers pollinated by flies and bats secrete foul odour to attract them.$\newline$ - Many flowers pollinated by flies and bats do emit strong, often unpleasant odors to attract these pollinators.$\newline$ - Therefore, this statement is true.$\newline \bullet$Option 4: Honey is made by bees by digesting pollen collected from flowers.$\newline$ - Honey is actually made by bees from the nectar of flowers, not pollen.$\newline$ - Bees collect nectar, which is then converted into honey through enzymatic activity and evaporation.$\newline$ - Therefore, this statement is not true.$\newline$Based on the analysis, the statement that is not true is Option 4.$\newline$Thus, the correct answer is Option 4.