Chapter 25

Roots and shoots lengthen through activity at a. apical meristems b. lateral meristems c. vascular cambium d. cork cambium

In many plant species, older roots and stems thicken by activity at ____________ . a. apical meristems b. cork cambium c. vascular cambium d. both b and c

________________ conducts water and ions; ____________ conducts food. a. Phloem; xylem b. Cambium; phloem c. Xylem; phloem d. Xylem; cambium

Mesophyll consists of ____________ . a. waxes and cutin b. lignified cell walls c. photosynthetic cells d. cork but not bark

In phloem, organic compounds flow through ______________ a. collenchyma cells b. sieve tubes c. vessels d. tracheids

Xylem and phloem are ___________ tissues. a. ground b. vascular c. dermal d. both b and c

In early wood, cells have ______________ diameters, ____________ walls. a. small; thick b. small; thin c. large; thick d. large; thin

Match the plant parts with the suitable description. a. masses of xylem b. source of primary growth c. distribution of sugars d. source of secondary growth e. distribution of water f. central column in roots apical meristem lateral meristem xylem phloem vascular cylinder wood