This quiz works best with JavaScript enabled. Home > Plant > Plant Physiology – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Plant Physiology Quiz 1 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the function of companion cells in phloem? A) To produce lignin. B) Control and maintain the sieve tube. C) Control movement of water in the tracheids. D) None of above. Show Answer Correct Answer: B) Control and maintain the sieve tube. 2. When cell structure changes and allows cells to assume a variety of specific functions it is called A) Differentiation. B) Alternative pathways. C) Reverse osmosis. D) None of above. Show Answer Correct Answer: A) Differentiation. 3. Trees that form vessels of uniform size throughout the growing season are called: A) Diffuse porous. B) Ring porous. C) Hydroponic. D) None of above. Show Answer Correct Answer: A) Diffuse porous. 4. This component provides strength and rigidity in plant cell walls, especially in wood. A) Phloem. B) Cellulose. C) Lignin. D) None of above. Show Answer Correct Answer: C) Lignin. 5. The walls of xylem tissue are reinforced with A) Concrete. B) Lignin. C) Starch. D) Glucose. Show Answer Correct Answer: B) Lignin. 6. A slightly englarged portion of the twig, where leaves and buds arise is called: A) Internode. B) Node. C) Leaf bud scar. D) None of above. Show Answer Correct Answer: B) Node. 7. What do arborists use to close stomata on trees during transplant? It also can reduce evaporative cooling of leaves, reduce CO2 uptake, and reduce photosynthesis A) Antiperspirant spray. B) Anti-transpirant spray. C) An-hydrous spray. D) None of above. Show Answer Correct Answer: B) Anti-transpirant spray. 8. Nutrients are absorbed by the root hairs by A) Osmosis. B) Diffusion. C) Active transport. D) None of the above. Show Answer Correct Answer: C) Active transport. 9. The xylem of angiosperms is composed of these 4 elements: A) Chloroplasts, vessels, phloem & stomata. B) Guard cells, tracheids, fibers & petioles. C) Tracheids, fibers, parenchyma cells & vessels. D) None of above. Show Answer Correct Answer: C) Tracheids, fibers, parenchyma cells & vessels. 10. What two characteristics determine how a tree will grow and develop? A) Food and water. B) Exercise and sleep. C) Genetic potential and surrounding environmental conditions. D) None of above. Show Answer Correct Answer: C) Genetic potential and surrounding environmental conditions. 11. These are adaptations trees have made to survive in hot, dry climates: A) Small leaves, Sunken stomata & thick cuticle. B) Large leaves and cuticle. C) Thin bark, small leaves & small crown. D) None of above. Show Answer Correct Answer: A) Small leaves, Sunken stomata & thick cuticle. 12. When you trim the outermost layer of a plant, it will soon die. Why is this? A) Nutrients cannot move through damaged phloem. B) Water cannot move through damaged xylem. C) Leaves cannot form from damaged stems. D) Sunlight cannot enter damaged stems. Show Answer Correct Answer: A) Nutrients cannot move through damaged phloem. 13. When roots are living in a symbiotic relationship with certain fungi that help the tree get essential minerals, it is called: A) Absorption. B) Osmosis. C) Mychorrizae. D) None of above. Show Answer Correct Answer: C) Mychorrizae. 14. These are living cells that are located in the outer layers of the xylem. They store carbohydrates, defend against decay and provide structural function across the grain: A) Sieve tube cells. B) Parenchyma cells. C) Epicormic cells. D) None of above. Show Answer Correct Answer: B) Parenchyma cells. 15. What is the process is where living cells take in oxygen and give off carbon dioxide? A) Respiration. B) Photosynthesis. C) Celluar respiration. D) Oxygen. Show Answer Correct Answer: A) Respiration. 16. What is the function of phloem A) To transport food/sugar. B) To transport lignin. C) To transport water. D) None of above. Show Answer Correct Answer: A) To transport food/sugar. 17. When an organism grows toward the sunlight it is called what? A) Luminescent. B) Photogenic. C) Phototropism. D) None of above. Show Answer Correct Answer: C) Phototropism. 18. What is the function of Xylem A) To transport food. B) To transport lignin. C) To transport water. D) None of above. Show Answer Correct Answer: C) To transport water. 19. Potatoes are commonly consumed in the modern diet. What part of the plant are they harvested from? A) Leaves. B) Stems. C) Roots. D) Seed. Show Answer Correct Answer: B) Stems. 20. Xylem tissue is composed of which two types of cells A) Xylem vessels and companion cells. B) Xylem vessels and sieve tubes. C) Tracheids and sieve tubes. D) Xylem vessels and tracheids. Show Answer Correct Answer: D) Xylem vessels and tracheids. 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