According to Metzer’s theory, the stem of the tree is built up in such a way as, with the minimum of material, to offer uniformly the greatest resistance to the stresses to which it is subjected.

Question

Match the structures with their functions in Cnidaria:

List I	List II
A. Cnidoblast --- I. Used for anchorage, defence and for the capture of prey B. Polyps --- IV. Produce Medusae asexually C. Medusae --- II. Used to form the polyps sexually D. Hypostome --- III. Single opening for gastrovascular cavity	I. Used for anchorage, defence and for the capture of prey IV. Produce Medusae asexually II. Used to form the polyps sexually III. Single opening for gastrovascular cavity

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