Which of the following group of organisms feeds directly on green plants?

Step 1: Analyze the question The question asks which group of organisms feeds directly on green plants. The key word is "directly", so we are looking for the first feeding level above the plants.

Step 2: Explain the concept (trophic levels) In a food chain, energy flows through these levels:

• Producers: green plants. They make their own food by photosynthesis, so they do not feed on other plants.
• Primary consumers: herbivores. They feed directly on green plants (e.g. grasshopper, goat, cow, rabbit).
• Secondary consumers: carnivores or omnivores that feed on primary consumers (e.g. frog, lizard).
• Decomposers: bacteria and fungi. They break down dead and decaying matter from all levels.

Step 3: Solution Example food chain: Grass → Grasshopper → Frog → Snake

• Grass is the producer.
• The grasshopper eats the grass directly, so it is a primary consumer.
• The frog eats the grasshopper, not the grass, so it is a secondary consumer.

Checking each option:

• A. Primary consumers: feed directly on green plants. ✔
• B. Secondary consumers: feed on primary consumers. ✘
• C. Producers: they are the green plants themselves. ✘
• D. Decomposers: feed on dead organic matter, not living green plants. ✘

Step 4: Answer The correct answer is A. Primary Consumers.

Exam tip: Remember "Primary = First to eat the plant." Herbivores are always primary consumers. If a question says "directly on green plants", think herbivores.