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- 7. What is transpiration? a. The movement of water from the root hair cells. b. The release of energy in plants. c. The evaporation of water from the leaves. d. The condensation of water from the leaves 8. Which hormone promotes seed germination? a. abscisic acid b. gibberellin C. ethylene d. auxin 9. Which of the following statements is true? a. Most reflexes travel only to the brain. b. Most reflexes travel only to the spinal cord. C. Most reflexes involve both the brain and spinal cord. d. Most reflexes involve the muscles only of neurons. 10. Sensory receptors are often the a, axons b. soma C. dendrites d. cell body4. Which of the following statements accurately compares two of the types of chordae tendineae? a. Tertiary chordae tendineae attach to the leaflet margins and prevent marginal prolapse of the leaflet, whereas primary chordae tendineae attach the annulus and base of the posterior leaflet to the papillary muscle. b. Tertiary chordae tendineae anchor the leaflets' ventricular surface to the papillary muscle and relieve tension, whereas secondary chordae tendineae attach the annulus and base of the posterior leaflet to the papillary muscle. c. Secondary chordae tendineae attach to the leaflet margins and prevent marginal prolapse of the leaflet, whereas primary chordae tendineae anchor the leaflets' ventricular surface to the papillary muscle and relieve tension. d. Primary chordae tendineae attach to the leaflet margins and prevent marginal prolapse of the leaflet, whereas secondary chordae tendineae anchor the leaflets' ventricular surface to the papillary muscle and relieve tension.7. Which of the following is correct about plant shoots?a. Plant shoots are negatively phototropic and positively gravitropic.b. Plant shoots are negatively hydrotropic and positively gravitropic.c. Plant shoots are positively phototropic and negatively gravitropic.d. Plant shoots do not display any major tropisms.8. In an unevenly irrigated soil, how would auxins affect the growth of theroot and the stem of a plant?a. The root would grow in the direction where water is abundant andso would the stem.b. The root would grow in the direction where water is abundantwhile the stem would grow upwards.c. The root would grow in the direction where water is abundantwhile the stem would grow in the opposite direction.d. Both would grow without changing direction regardless of theabundance of water.
- 3. Read the following statements about plant growth substances Cytokinins promote cell division Abscisic acid closes stomata Giberellins promote leaf growth Auxin promotes cell elongation Ethene prevents fruit ripening iv) v)7. Which of the following is correct about plant shoots? a. Plant shoots are negatively phototropic and positively gravitropic. b. Plant shoots are negatively hydrotropic and positively gravitropic. c. Plant shoots are positively phototropic and negatively gravitropic. d. Plant shoots do not display any major tropisms. 8. In an unevenly irrigated soil, how would auxins affect the growth of the root and the stem of a plant? a. The root would grow in the direction where water is abundant and so would the stem. b. The root would grow in the direction where water is abundant while the stem would grow upwards. c. The root would grow in the direction where water is abundant while the stem would grow in the opposite direction. d. Both would grow without changing direction regardless of the abundance of water. 9. Which of the following best describes tropism? a. Tropism is the response of a plant to grow toward or away from a stimulus. b. Tropism is the mechanism by which a plant…PR Singly and in combination to regulate the growth and development of higher plants. The effects of hormones, either stimulatory or inhibitory, depend on the hormone concentration, the tissue affected, and the developmental status of the tissue. This lab will focus on just three hormones: Auxin, Ethylene, and Gibberellic Acid. Student Preparation Read textbook Chapter 27, pages 638-659. LA. Apical Dominance Indole-3-acetic acid (IAA) is the principal naturally occurring auxin. It is produced by terminal shoot buds and commonly inhibits development of lateral, or axillary, shoot buds. Observe the plant which was cut several weeks ago so as to remove the primary shoot apical meristem. Note the presence of several lateral shoot buds growing from the main stem. This lab is adapted from: Evert RF, Eichhorn SE, Perry JB. 2013. Laboratory Topics in Botany. 8th ed. New York: WH Freeman; 27-1 p. 101
- 7. Name the gaseous plant hormone and describe three different actions of this hormone in plants. 8. Explain how the auxin:cytokinin ratio affects plant growth. 9. Which plant hormones are considered as growth inhibitorss? Why? 10. how does auxin promote phototropism?discuss five (5) plant hormonesIron deficiency results in- (A) Leaf tip necrosis (B) Small leaves disease (C) Decreased protein synthesis (D) Intervenal chlorosis appearing first in young leaves
- 7. is a simple hydrocarbon that is the only gaseous plant hormone.B. Identify the plant responses to inducing hormones. Choose your answers in the box and write the correct answers on the blank. G. FLORIGEN A. AUXIN D. ABSCISIC ACID B. GIBBERELLINS E. ETHYLYNE H. METHYL SALICYLATE C. CYTOKININS F. SYSTEMIN _1. Seed germination _2. Phototropism _3. Maintains seed dormancy _4. Shoot elongation _5. Leaf drop _6. Stimulates lateral bud _7. Influence flowering 8. Gravitropism _9. Closes stomata _10. Prevents lateral bud sprout (apical dominance) _11. Fruit development 12. Fruit ripening 13. Gaseous hormoneThe nutritive tissue in the seeds of flowering plants that is formed from the union of a sperm cell and two polar nuclei is called the (a) plumule (b) endosperm (c) cotyledon (d) hypocotyl (e) radical