Classify the provided specimens (A-H) into trophic levels and construct food chains. Explain the 10% energy transfer rule.

Here are the answers to your questions based on the provided specimens:

Specimens:
A = Lizard
B = Grasshopper
C = Moss
D = Garden Snail
E = Pine
F = Mushroom
G = Clam
H = Bird

3(i) Classification of Specimens:

• Decomposers:
  • F = Mushroom
• Producers:
  • C = Moss
  • E = Pine
• Primary Consumers:
  • B = Grasshopper
  • D = Garden Snail
  • G = Clam
• Secondary Consumers:
  • A = Lizard
  • H = Bird

3(ii) Food Chains (at least 3 organisms involved):

1. Moss (C) → Grasshopper (B) → Bird (H)
2. Pine (E) → Garden Snail (D) → Bird (H)
3. Moss (C) → Grasshopper (B) → Lizard (A)

3(iii) Decrease in Energy Transfer:

A decrease in energy transfer is observed as one moves from one trophic level to the next in a food chain because a significant portion of energy is lost at each level. This energy loss occurs primarily through metabolic processes (respiration), which release heat, and because not all biomass from the lower trophic level is consumed or assimilated by the next level. Typically, only about 10% of the energy from one trophic level is transferred to the next.