Consider the given diagram of upper surface of brachiopod shell, choose the correct set of 5 morphological terms. P–Nototherium Q–Hinge R–Cardinal process S–Delthyrium T–Inter area
1–S, 2–R, 3–T, 4–Q
Articulate brachiopods have two unequal valves hinged along a straight posterior margin. Near the beak of the pedicle valve lie several standard features: the delthyrium (a triangular notch through which the pedicle emerges), the interarea (a flat, triangular shelf between the beak and the hinge line), the cardinal process (a knob-like projection on the brachial valve that anchors the diductor muscles) and the hinge line itself.
In the labelled diagram, arrow 1 points to the opening beside the beak, which is the delthyrium. Arrow 2 points to the knob lying just under the beak, the cardinal process. Arrow 3 marks the flat triangular surface beside the beak, the interarea. Arrow 4 points to the straight posterior shell margin along which the valves articulate, the hinge. This gives the pairing delthyrium, cardinal process, inter area and hinge for arrows 1 to 4.
Codes that assign Nototherium to any arrow fail at once, because Nototherium is an extinct Australian marsupial genus and not a part of a brachiopod shell. A code that calls arrow 1 the hinge or arrow 3 the cardinal process mislabels the opening and the flat area, so it cannot match the diagram.
1–S, 2–R, 3–T, 4–Q option is correct.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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(i) Kernel
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(iii) Nucleus
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(i) Machine language
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