To solve this problem, we need to identify the important floral rewards that attract animal pollinators. Let's analyze each option:$\newline \bullet$Option 1: Colour and large size of flower - While these features can attract pollinators, they are not considered direct rewards.$\newline \bullet$Option 2: Nectar and pollen grains - These are the primary rewards for pollinators. Nectar provides a sugar-rich food source, and pollen is a source of protein.$\newline \bullet$Option 3: Floral fragrance and calcium crystals - Fragrance can attract pollinators, but calcium crystals are not a reward.$\newline \bullet$Option 4: Protein pellicle and stigmatic exudates - These are not typical rewards for pollinators.$\newline$Therefore, the correct option is Option 2, as nectar and pollen grains are the important floral rewards to animal pollinators.