Answer:
The population of insects will increase.
Step-by-step explanation:
The frog and insects are consumers which can be seen in a food chain in any grassland ecosystem. A food chain is a sequence of different organisms in which one organism is eaten by another organism. A food chain consists of producers and different consumers.
As per the given question, Insects eat grasses ( producer) are primary consumers and frogs eat insects are secondary consumers.
If the number of frogs decreases from the food chain, the number of insects will increase due to less number of their predators.