Matching Bivalvia Species with Ecology

This question requires matching specific bivalve genera from Group I to their characteristic ecological modes described in Group II.

P. Mytilus Ecology

Mytilus, commonly known as mussels, are characterized by their attachment to substrates using strong, sticky threads called byssal threads. This attachment method is described as 'Bysally attached'.

Therefore, P matches with 3. Bysally attached.

Q. Pecten Ecology

Pecten, or scallops, are unique among bivalves for their ability to swim actively. They achieve this by forcefully expelling water from their mantle cavity, allowing them to move through the water column. This mode is described as 'Swimmer'.

Therefore, Q matches with 2. Swimmer.

R. Ostrea Ecology

Ostrea, the oysters, are typically sessile organisms that attach themselves firmly to hard surfaces. They secrete a cement-like substance for permanent attachment, a characteristic known as 'Cemented'.

Therefore, R matches with 1. Cemented.

S. Mya Ecology

Mya, represented by the soft-shell clam, is a burrowing bivalve. It lives within the seafloor sediment, digging a vertical burrow. This lifestyle is termed 'Infaunal'.

Therefore, S matches with 4. Infaunal.

Summary of Bivalvia Matches

The correct matching derived from ecological characteristics is P-3, Q-2, R-1, S-4.