Topic explanation

Standard explanation

Worked chain labels: Grass: producer. Grasshopper: primary consumer. Frog: secondary consumer. Arrows point to the eater.

Key points

• arrows to eater
• producer first
• CHAIN RULES: Start with a producer (or detritus in a detrital chain).
• FOOD CHAINS AND WEBS: Chain: grass -> grasshopper -> frog -> snake -> hawk (example).
• WHAT — FOOD CHAINS AND WEBS — CHAIN RULES: Start with a producer (or detritus in a detrital chain). Length is short because energy dies as heat
• WHY — Why this topic matters: FOOD CHAINS AND WEBS — CHAIN RULES is an independent FBISE learning unit because students must conne
• EXAM APPLICATION: Worked chain labels: Grass: producer. Grasshopper: primary consumer. Frog: secondary consumer. Arrow
• Start with a producer (or detritus in a detrital chain).

Labelled diagram