Chapter 33, Problem 7
What does the cuticle do? What do stomata do? Predict how the thickness of the cuticle and the number of stomata differ in plants from wet habitats versus dry habitats.
Video transcript
What is the role of companion cells in the movement of sugars through plants? a. They are the sites of sugar production by photosynthesis. d. They are the sites where starch is converted to sucrose. c. They secrete sucrose, which draws sugars through phloem under negative pressure. d. They accumulate sucrose, which is then transferred to adjacent sieve-tube elements.
Which statement best characterizes secondary growth? a. It results from cell divisions in the vascular and cork cambia. b. It increases the length of the plant stem. c. It results from divisions in the apical meristem cells. d. It often produces phloem cells to the inside and xylem cells to the outside of the vascular cambium.
Describe the general function of the shoot and the general function of the root system. Which tissues are continuous throughout these two systems? Suggest a hypothesis to explain why the shoot and root systems of different species are so variable in size and shape.
You attached a birdfeeder to a tree 5 years ago at a position 6 feet above the ground. The tree has grown since at a rate of 1 foot per year. What is the current height of the birdfeeder?
Identify the structure you are consuming when you eat each of the following: asparagus, Brussels sprouts, celery, spinach, carrot, potato.
Trees can be killed by girdling—the removal of bark and vascular cambium in a ring all the way around the tree. Explain why.