Peacock eats a snake and snake eats frog and frog eats insects, while insects eat green plants. The position of peacock is:

at the apex of food ecological pyramid

The correct answer is Option (4) - at the apex of food ecological pyramid

In this food chain, the green plants are the primary producers, which produce their own food through photosynthesis. The insects that eat these plants are primary consumers (herbivores). The frog eats insects, making it a secondary consumer. The snake, which eats the frog, is a tertiary consumer. Finally, the peacock, which eats the snake, is at the apex of the food chain, meaning it is at the top of the ecological pyramid, as it has no natural predators in this food chain.