Which of the following causes increase in the diameter of a stem? a. Increase in size of cells in enlargement region. b. Secondary xylem produced by the vascular cambium. c. Secondary phloem produced by the vascular cambium. d. All of the above.
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Which of the following causes increase in the diameter of a stem?
a. Increase in size of cells in enlargement region.
b. Secondary xylem produced by the vascular cambium.
c. Secondary phloem produced by the vascular cambium.
d. All of the above.
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- Which of the following statements is false? a. Auxin and gibberellin promote stem elongation b. Cytokinin promotes cell division in shoot tips c. Abscisic acid promotes water loss and dormancy d. Ethylene promotes fruit ripening and abscission.Ground tissue in monocot stems performs the same functions as _______________ and _______________ in herbaceous eudicot stems. (a) phloem; xylem (b) cork cambium; vascular cambium (c) epidermis; periderm (d) primary xylem; secondary xylem (e) cortex; pithChoose the incorrect statement: a. Fusiform and ray initials are formed by the vascular cambium. b. The cork cambium produces the periderm layer, a thicker tougher outer layer that replaces the epidermis. c. Wood is composed of secondary xylem. d. The vascular cambium separates the xylem on the outside of the stem and the phloem on the inside.
- 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 CA monocot stem differs from a eudicot stem in that, in the monocot stem,a. xylem and phloem are in a ring surrounding the pith.b. xylem and phloem are in bundles scattered throughout the stem.c. there is an organized cortex and pith.d. xylem forms a star in the center, with phloem between the points of the star.e. the epidermis does not have a waxy cuticle covering it.Choose the incorrect statement: a. Bundle sheath cells surround the vascular bundles in both eudicots and monocots. b. Phloem sieve elements contain a higher concentration of amino acids than xylem vessels. c. Phloem sieve elements and xylem tracheary elements are similar at maturity because they are both dead. d. Root hairs are the primary cell type that absorbs water in roots.
- 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.Which of the following statements about primary growth and secondary growth is/are true? A. Primary growth originates at the root apical meristem and shoot apical meristem. B. Secondary growth originates at the cork cambium and vascular cambium. C. Primary growth adds to the length of the plant. D. Secondary growth adds to the width of the plant. E. All of the above F. C and DPlace the letter of the definition in the box next to its correct term Primary growth A. tissue for protection; prevents water loss Vascular cambium B. tissue that transports sugars up & down the plant Ground tissue C. creates secondary xylem & phloem Xylem D. tissue for metabolism, storage & support Bark E. Consists of cork, cork cambium & secondary phloem Dermal tissue F. tissue that transports water from roots to stems Phloem G. comes from the apical meristem
- 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 growthWhen absorption of water by the roots fails to keep up with the rate of transpiration, gain in turgor occurs, and the stomata close. A. Agree, because the transpiration occurs faster than root absorption. D. Disagree, because the condition should be when root absorption is able to keep up with transpiration, then stomates close. B. Disagree, because under this condition, the turgor pressure decreases and the stomates close. C. Agree, because increase in turgor pressure under this condition, closes the stomates.A region of active cell division where primary growth occurs is the a. internode.b. apical meristem.c. root nodule.d. cork cambium.e. vascular cambium.