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 minerals through a plant, and __________ conducts sugars. 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

Which of the following cell types are alive in mature tissue? Choose all that apply a. collenchyma cells b. sieve tubes c. vessel members d. tracheids e. companion cells f. sclerenchyma cells

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

Tree rings occur when __________. a. there are droughts during the time the rings form b. environmental conditions influence xylem cell size c. heartwood alternates with sapwood

Bark is mainly __________. a. periderm and cork b. cork and wood c. periderm and phloem d. cork cambium and phloem

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