Arrange the following in a logical order: 1) Frog 2) Eagle 3) Grasshopper 4) Snake 5) Grass

The correct answer is C. The sequence 5, 3, 1, 4, 2 is a food chain read from the producer upward: Grass (producer), then Grasshopper (herbivore, eats grass), then Frog (eats the insect), then Snake (eats the frog), then Eagle (top predator, eats the snake). Energy moves one trophic level at a time, and each organism is eaten by the next.

The other options break the direction of energy flow:

• Option A makes grass a predator of grasshopper, which is impossible because grass is a producer.
• Option B places grass after the eagle, which would mean the eagle eats grass.
• Option D puts the frog after the eagle, so the eagle eats the frog and the snake is skipped as the frog's predator.

This links to the Environment and Ecology syllabus and to Mains questions on biomagnification. Because the eagle sits at the top, it accumulates persistent pesticides like DDT, which thinned raptor eggshells, a point Rachel Carson made in Silent Spring.

Trap: Candidates often arrange by size or by habitat instead of by who eats whom, or they reverse the arrow and start from the top predator.