This quiz works best with JavaScript enabled. Home > Agriculture > Plant Biology > Studies > Plant Biology – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Plant Biology Quiz 15 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Leaves capture light from the sun by using light absorbing pigments. This light absorbing pigment is called: A) Pollen. B) Chlorophyll. C) Auxin. D) Chloroplast. Show Answer Correct Answer: B) Chlorophyll. 2. Which structure serves the same function as the yolk of a bird egg? A) Cotyledon. B) Cuticle. C) Fruit. D) Seed. Show Answer Correct Answer: D) Seed. 3. Where does photosynthesis happen in a plant? A) Flower. B) Stem. C) Roots. D) Leaf. Show Answer Correct Answer: D) Leaf. 4. What is the primary function of companion cells? A) To move sugars into and out of the phloem. B) To provide structural support fo the plant. C) To pump water and minerals up the xylem. D) To serve as a sink for manufactured sugars. Show Answer Correct Answer: A) To move sugars into and out of the phloem. 5. A plant that is moving towards a stimulus is showing ..... tropism. A) Positive. B) Shoot. C) Root. D) Negative. Show Answer Correct Answer: A) Positive. 6. In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plant's responses to ..... A) Gravity. B) Water. C) Sunlight. D) Osmosis. Show Answer Correct Answer: A) Gravity. 7. Which of the following is correct relationship between hormone and its function? A) Auxin = Inhibit seed germination. B) Ethylene = Fruit maturation. C) Absisic acid = Promote root growth. D) Cytokinin = Drought tolerance. Show Answer Correct Answer: B) Ethylene = Fruit maturation. 8. What are the openings on the underside of leaves that let carbon dioxide into the leaf and let oxygen out? A) Stomata. B) Cuticle. C) Chloroplasts. D) Stomach. Show Answer Correct Answer: A) Stomata. 9. Which one of these isn't a characteristic of the bryophytes? A) First non aquatic plants. B) Adapted to be fixed to the ground and sustain. C) Moist habitat. D) Vascular tissue. Show Answer Correct Answer: D) Vascular tissue. 10. What kind of gas do plants produce during photosynthesis? ? ? ? ? ? A) Roots. B) Glucose. C) Carbon Dioxide. D) Oxygen. Show Answer Correct Answer: D) Oxygen. 11. What are the cells that make up Phloem? A) Spiracles. B) Vessel Cells. C) Sieve Tube Cells. D) Tracheary Elements. Show Answer Correct Answer: C) Sieve Tube Cells. 12. What adaptation allowed plants to grow tall? A) Vascular tissue. B) Roots. C) Fronds. D) Stems. Show Answer Correct Answer: A) Vascular tissue. 13. How is the translocation of water through capillarity explained? A) As water transpires from the leaves, a pull is created on the column of water. B) As wind speed and temperature increase the rate of translocation increases. C) The root tissues, full of water, exert pressure that forces water up the xylem. D) Water moves upwards due to the adhesion of the water molecules to tracheid walls. Show Answer Correct Answer: D) Water moves upwards due to the adhesion of the water molecules to tracheid walls. 14. What might a thin tree ring indicate? A) Increased production of xylem. B) Decreased production of phloem. C) Xylem production in winter. D) A year of drought. Show Answer Correct Answer: D) A year of drought. 15. A plants directional growth in response to external stimuli is called ..... A) Tropism. B) Homeostasis. C) Taxi. D) Turgor Pressure. Show Answer Correct Answer: A) Tropism. 16. The regions of tissue in a plant that produce cells that later become specialized tissues are the A) Leaves. B) Roots. C) Stems. D) Meristems. Show Answer Correct Answer: D) Meristems. 17. Which of the following conditions is least likely to increase the rate of transpiration in a plant? A) Increased sunlight. B) Increased air movement. C) A rise in temperature. D) An increase in humidity. Show Answer Correct Answer: D) An increase in humidity. 18. The movement of O2 and CO2 between the plant and the environment is known as A) Gas exchange. B) Transport. C) Respiration. D) Photosynthesis. Show Answer Correct Answer: A) Gas exchange. 19. The process in which plants make food is called A) Photosynthesis. B) Fertilization. C) Pistil. D) A life cycle. Show Answer Correct Answer: A) Photosynthesis. 20. How will lowered humidity affect the rate of transpiration? A) It depends. B) Increase it. C) No change. D) Decrease it. Show Answer Correct Answer: B) Increase it. 21. Roots have ..... gravitropism whereas stems and leaves have ..... gravitropism. A) No, upward. B) Downward, no. C) Positive, negative. D) Negative, positive. Show Answer Correct Answer: C) Positive, negative. 22. Which Of The Following Is Parasite? A) Lichens. B) Fungus. C) Cuscuta. D) Algae. Show Answer Correct Answer: C) Cuscuta. 23. Water gets into root hair cells through the process of ..... A) Diffusion. B) Active transport. C) Osmosis. D) None of above. Show Answer Correct Answer: C) Osmosis. 24. The phloem of a plant is responsible for: A) Making the plant trunk thicker. B) Making the plant grow taller. C) Carrying water to all parts of the plant. D) Carrying sugars to all parts of the plant. Show Answer Correct Answer: D) Carrying sugars to all parts of the plant. 25. What do plants release during photosynthesis that is important for human and animals? A) Oxygen. B) Nicotin. C) Water. D) Carbon dioxide. Show Answer Correct Answer: A) Oxygen. 26. Which of the following would NOT increase transpiration? A) Warm temperatures. B) High winds. C) High humidity. D) Increased light. Show Answer Correct Answer: C) High humidity. 27. A ..... is an organism that uses energy from an outside source, such as the sun, to make its own food. A) Producer. B) Solar. C) Consumer. D) Energizer. Show Answer Correct Answer: A) Producer. 28. What causes water to fill the xylem pipeline completely, from the roots to the leaves, and to resist any separation? A) Active transport of sugar into/out of phloem cells. B) Root pressure. C) Atmospheric pressure. D) Cohesion of water molecules. Show Answer Correct Answer: D) Cohesion of water molecules. 29. Gymnosperms hold seeds in male and female: A) Cones. B) Spores. C) Eggs. D) Sperm. Show Answer Correct Answer: A) Cones. 30. The gametophytes of gymnosperms are found inside reproductive structures called A) Angiosperms. B) Flowers. C) Cones. D) Embryos. Show Answer Correct Answer: C) Cones. ← PreviousNext →Related QuizzesPlant Biology QuizzesAgriculture QuizzesPlant Biology Quiz 1Plant Biology Quiz 2Plant Biology Quiz 3Plant Biology Quiz 4Plant Biology Quiz 5Plant Biology Quiz 6Plant Biology Quiz 7Plant Biology Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books