BIO 1-10 Questions Exam 4

Which of the following statements about the two different forms of phytochrome (Pr vs. Pfr) is true?

• a. Phytochrome ratios function to detect the length of the light period in a 24 hour cycle.

• b. Long day plants require a low ratio of Pfr to Pr ratio in order to flower

• c. Pr is the active form of phytochrome while Pfr is the inactive form

• d. Pfr is the main form of phytochrome in those plants that are in the shade of other plants

• e. Red light causes Pr to convert to the Pfr form.

2. Which of the following cell/tissue types in plants is most likely to divide?

• a. meristem

• b. epidermis

• c. xylem

• d. sclerenchyma

• e. parenchyma

3. The diagram below best represents a model that attempts to illustrate and/or describe . . .

• a. how the transpiration stream functions in plants.

• b. how guard cells open & close in response to osmosis.

• c. how plant cells are immersed in a solution of water.

• d. how the process of phloem transport occurs in plants.

• e. how roots absorb water & minerals from the soil.

4. Which of the following cell/tissue types or structures is not found in (or part of) the shoot system of a plant?

• a. Axilary bud

• b. Endodermis

• c. Petiole

• d. Epidermis

• e. Node

5. Which of the plant hormones is incorrectly matched with at least one of its functions or roles?

• a. Cytokinin — stimulates the formation of nutrient sinks.

• b. Auxin — promotes or enforces apical dominance.

• c. Ethylene — causes leaf abscision in most plants

• d. Gibberellin — promotes fruit ripening.

• e. Abscisic Acid — causes stomates to close.

6. Fluctuations in population growth can correlate (or be associated) with changes in . . .

• a. predation

• b. parasitism

• c. weather

• d. resource availability

• e. All of the above.

7. Which of the following statements about the ecological “niche” of an organism is/are true?

• a. The niche includes how an organism competes and acquires food.

• b. The niche is the same as an organism’s habitat.

• c. The niche of an organism is usually occupied by another species.

• d. The niche of an organism is typically unique and specific to that organism.

• e. Both a and d are true.

8. The main function of “companion cells” is to . . .

• a. protect tissues from drying out.

• b. nourish xylem cells during growth.

• c. transport assimilate into sieve cells.

• d. facilitate stomatal opening & closing.

• e. control the uptake of minerals by roots.

9. Which of the following choices correctly lists the cells/tissues in the order through which water will pass onits way from the outside of the root to the conducting cells on the inside of the root?

• a. epidermis – endodermis – cortex – pericycle – xylem

• b. epidermis – cortex – endodermis – pericycle – xylem

• c. endodermis – pericycle – cortex – xylem – epidermis

• d. cortex – epidermis – percycle – endodermis – xylem

• e. epidermis – pericycle – endodermis – xylem – cortex

10. The three main tissue types in plants are ___ , ___ & ___ .

• a. ground, vascular & epidermal

• b. parenchyma, collenchyma, sclerenchyma

• c. leaves, roots & stems

• d. xylem, phloem & parenchyma

• e. epidermal, endodermal & mesodermal