Answer: You would offer food or flowers to a God such as Shiva to obtain a blessing. When this happens you would hope for a fertile life, health upon cattle, and innovations to poison and medicine. These things are specifically chosen because the God Shiva (performs these roles as a Hindu deity).
Step-by-step explanation:
They might offer flowers and food to the God named Shiva because it would create a blessing. The God Shiva is the God of "the great ascetic, the master of fertility, the master of poison and medicine, and Lord of Cattle". When you give flowers and food you are hoping for good fertility, good health and innovations to medicine, and good health upon their cattle.
I hope this is able to help you :D