Read the passage given below and answer the question.
Food chains βPβ and βQβ form an interconnection. βPβ initiates with wheat grass whose population supports a few grasshoppers, frogs and snakes.
βQβ starts with dead decaying leaves of wheat grass which are eaten by earthworms and then food chain is continued with frog of food chain βPβ.
Identify the types of food chains βPβ and βQβ: