Chapter 05 – Roots and Soils
35. Buds that develop on roots are referred to as
36. Mycorrhizae roots are those that
37. Which statement about mycorrhizae is INCORRECT?
Chapter 05 – Roots and Soils
38. The rootlike projections of parasitic plants that develop along their stems and penetrate the
host plants’ tissues are called
39. Which of the following is/are absent in dicot roots?
40. Which of the following spices or flavorings is obtained from roots?
Chapter 05 – Roots and Soils
41. People harvest the storage roots of biennials such as __________ for their food value.
42. Which soil horizon is the most important agriculturally?
43. The best soil for plant growth is
Chapter 05 – Roots and Soils
44. Water that drains out of the pores in soils after a rain is called
45. Good agricultural soils are granular soils with pore spaces that occupy which of the
following percentages of the total volume of the soil?
Chapter 05 – Roots and Soils
46. The arrangement of soil particles into groups called aggregates refers to
47. What does too much water do to the soil?
Chapter 05 – Roots and Soils
48. In a soil profile, topsoil is called the
49. Soil water between field capacity and the permanent wilting point is called
Chapter 05 – Roots and Soils
True / False Questions
50. A root hair consists of a short row of cells.
51. Pith tissue is absent in dicot roots.
52. Soil parent material extends down to bedrock.
Chapter 05 – Roots and Soils
53. Soils in low wet areas tend to contain hardly any organic matter.
54. Clay particles have negative electric charge which tend to retard water drainage and retain
positively charged ions.
55. A colloid is a mixture of water and particles that are smaller than average molecules in
size.
Chapter 05 – Roots and Soils
56. Soil bacteria and fungi are important components of soil because they contribute to soil
porosity and release useable minerals by decomposing organic matter.
57. Liming is used to counteract soil acidity.
58. The protective suberin bands called Casparian strips are confined to the cells of the
epidermis.
Chapter 05 – Roots and Soils
59. Branch roots arise from buds initiated on the outer surface of a root.
60. When a seed germinates, the part of the embryo that develops into the first root is called a
radicle.
61. Outer cells of the root cap secrete mucilage.
Chapter 05 – Roots and Soils
62. Haustoria and mycorrhizae are two examples of tap roots.
63. Grasses generally produce a fibrous root system.
64. Casparian strips are composed primarily of suberin.
65. Natural grafting between roots of different trees of the same species is well known in the
tropics.
Chapter 05 – Roots and Soils
66. In dicot roots the xylem is formed in discrete patches.
67. Contractile roots are common in woody plants.
68. Plant root systems can detect and respond to gravity within 30 minutes to a few hours.
69. The function of mycorrhizae fungi is to facilitate uptake and availability of water and
minerals, especially phosphorous.
Chapter 05 – Roots and Soils
70. The vascular tissue of a new lateral (branch) root connects with the vascular tissue of the
older root for continuous conduction of water and minerals.
71. The term saprophyte is correctly applied to plants such as orchids that grow on other
plants and obtain water and nutrients from the air and/or rain.