1) An orienting response to food 2) Tropism 
direction of growth by nutritional factors
Chemotaxis of living cells in relation to nutritive material; it may be positive (toward nutritive material) or negative (away from nutritive material). ... Synonym: trophotaxis. ... Origin: tropho-+ G. Trope, a turning ... (05 Mar 2000) ... 
(tro″fo-tro´piz-әm) chemotropism of an organism in response to nutritive material.
Type: Term Pronunciation: trō-fot′rō-pizm Definitions: 1. Chemotaxis of living cells in relation to nutritive material; it may be positive (toward nutritive material) or negative (away from nutritive material). Synonyms: trophotaxis
[n] - an orienting response to food
trophotropism Chemotaxis of living cells in relation to nutritive material; it may be positive (toward nutritive material) or negative (away from nutritive material).
noun an orienting response to food