tomatal opening is induced by… Select one: a. high CO2 levels in the leaf. b. abscisic acid produced by mesophyll cells. c. proton pumps activated by green light. d. an increase in the water potential (becomes more positive) of guard cells. e. active transport of H+ ions out of the guard cell.

When the stomata are closed, Select one: O a. gas and water exchange increase. O b. water exchange is reduced. O c. gas exchange is reduced. O d. gas and water exchange are reduced. Ch 7 and 8 Written Response signment - Jan 26 Jump to...

Which of the following statements is incorrect? a. Vascular bundles are arranged in a ring in the outer parts of monocot stems in whereas in eudicots they are scattered throughout the stem. b. The cuticle is a hydrophobic layer that covers the aerial part of plants c. Vascular bundle arrangement is different in stem and root. d. The epidermis and periderm form the dermal tissue of plants.

4. Plant roots are positively gravitropic; what does this mean?   a. They are positively attracted to soil. b. They grow toward the direction of gravity. c. They grow away from other plant roots. d. They grow in the opposite direction to sunlight.   5. Plant shoots are positively phototropic; what does this mean?   a. They grow toward a light stimulus. b. They grow toward other brightly colored plants. c. They grow away from bright sunlight. d. They reflect the majority of the wavelengths of light.   6. Which of the following is correct about plant roots?   a. Plant roots are positively phototropic and negatively gravitropic. b. Plant roots are negatively phototropic and positively gravitropic. c. Plant roots are positively hydrotropic and negatively gravitropic. d. Plant roots do not display any major tropisms.

What is the term used to identify the multi-cellular ring of fibers surrounding each of the vascular bundles in a C3 leaf’s veination?   Select one: a. fiber sheath b. collenchyma collar c. turgor ring d. stomatal sheath e. granum circle

Which of the following is/are false regarding the phloem? A. It transports starch from the leaves to the stem. B. It transports sucrose from the leaves to the roots. C. It is located lateral to the xylem in tree stems. D. Unlike the xylem, majority of the cells are living. E. A and D F. B and C

Which of the following is false? a. Stems have vascular bundles, and roots have vascular cylinders. b. Lateral roots can arise from nodes on a root. c. Primary growth (lengthening) can occur at an axillary bud. d. Apical meristem gives rise to epidermal tissue, ground tissue, and vascular tissue. e. Wood is xylem that forms during secondary growth