Insects often eat leaves and other plant structures in order to obtain nutrients such as sugar. Which location in a plant will most likely provide sugars for the insect because it is a part of the phloem?
A - Vesicles
B - Meristematic cells
C - Tracheids
D - Xylem
E - Sieve tubes
Answer: E - Sieve tubes
Sieve TUBES are more advanced than sieve cells and are found in flowering vascular plants (angiosperms). They have specialized cells called companion cells located near them that carry out energy-consuming metabolic activities for the sieve tube elemetns, which improves the efficiency of the phloem.