Secondary growth in plants 100 MCQ
1. Secondary growth in plants refers to:
a. Increase in plant height
b. Increase in plant root length
c. Increase in plant stem girth
d. Increase in leaf surface area
Answer: c. Increase in plant stem girth
2. Which tissue is responsible for secondary growth in plants?
a. Meristematic tissue
b. Epidermal tissue
c. Ground tissue
d. Vascular tissue
Answer: a. Meristematic tissue
3. The lateral meristem responsible for secondary growth in stems is called:
a. Apical meristem
b. Intercalary meristem
c. Vascular cambium
d. Cork cambium
Answer: c. Vascular cambium
4. Which layer of the stem gives rise to secondary phloem?
a. Epidermis
b. Cortex
c. Vascular cambium
d. Xylem
Answer: c. Vascular cambium
5. The secondary xylem is also known as:
a. Phloem
b. Bark
c. Wood
d. Cork
Answer: c. Wood
6. Which of the following is NOT a function of secondary growth in plants?
a. Provides mechanical support
b. Allows for water and nutrient transport
c. Helps in storage of food reserves
d. Aids in reproduction
Answer: d. Aids in reproduction
7. The cork cambium is responsible for the formation of:
a. Cork cells
b. Vascular tissue
c. Root hairs
d. Leaf epidermis
Answer: a. Cork cells
8. The cork cambium is located:
a. In the center of the stem
b. In the outermost layer of the stem
c. In the xylem tissue
d. In the phloem tissue
Answer: b. In the outermost layer of the stem
9. The protective layer that replaces the epidermis during secondary growth is called:
a. Xylem
b. Phloem
c. Cork
d. Vascular cambium
Answer: c. Cork
10. The rings seen in a cross-section of a tree trunk represent:
a. Annual growth rings
b. Secondary meristem rings
c. Vascular cambium rings
d. Primary xylem rings
Answer: a. Annual growth rings
11. The process of secondary growth occurs in which parts of the plant?
a. Leaves
b. Stems and roots
c. Flowers
d. Fruits
Answer: b. Stems and roots
12. The primary meristematic tissue responsible for secondary growth in roots is called:
a. Apical meristem
b. Vascular cambium
c. Cork cambium
d. Root cap
Answer: b. Vascular cambium
13. The secondary growth in roots results in the formation of:
a. Secondary xylem
b. Secondary phloem
c. Secondary cortex
d. Secondary epidermis
Answer: a. Secondary xylem
14. Which of the following is NOT a function of secondary phloem?
a. Transport of sugars and other organic nutrients
b. Provides mechanical support
c. Storage of food reserves
d. Forms part of the bark
Answer: b. Provides mechanical support
15. The term "heartwood" refers to:
a. The outermost layer of the stem
b. The central region of the stem composed of dead cells
c. The actively dividing meristem in the stem
d. The region where the xylem and phloem meet
Answer: b. The central region of the stem composed of dead cells
16. The formation of annual growth rings is influenced by:
a. Temperature and humidity
b. Sunlight exposure
c. Soil composition
d. All of the above
Answer: d. All of the above
17. The process of secondary growth is regulated by:
a. Hormones such as auxin and cytokinin
b. Environmental factors such as light and temperature
c. Genetic factors
d. All of the above
Answer: c. Genetic factors
18. The outermost layer of the stem responsible for gas exchange and protection is called:
a. Xylem
b. Phloem
c. Epidermis
d. Cork
Answer: c. Epidermis
19. The cork cambium gives rise to:
a. Secondary xylem
b. Secondary phloem
c. Cork cells
d. Vascular tissue
Answer: c. Cork cells
20. The process of secondary growth in plants is most active during:
a. Spring
b. Summer
c. Fall
d. Winter
Answer: b. Summer
21. The term "cambium" refers to:
a. The outermost layer of the stem
b. The actively dividing region of meristematic tissue
c. The innermost layer of the stem
d. The region where the xylem and phloem meet
Answer: b. The actively dividing region of meristematic tissue
22. The secondary growth in stems and roots contributes to:
a. Increase in plant height
b. Increase in plant root length
c. Increase in stem girth
d. Increase in leaf size
Answer: c. Increase in stem girth
23. The cork cells in the bark of a tree are impermeable to:
a. Water and nutrients
b. Carbon dioxide
c. Oxygen
d. Sunlight
Answer: a. Water and nutrients
24. The term "bark" refers to:
a. The secondary phloem, cork cambium, and cork layers
b. The outermost layer of the stem
c. The innermost layer of the stem
d. The actively dividing region of the stem
Answer: a. The secondary phloem, cork cambium, and cork layers
25. The main function of the cork cambium is to:
a. Produce new xylem cells
b. Produce new phloem cells
c. Produce new cork cells
d. Produce new epidermal cells
Answer: c. Produce new cork cells
26. The cells of the secondary xylem are:
a. Living at maturity
b. Dead at maturity
c. Capable of photosynthesis
d. Responsible for water absorption
Answer: b. Dead at maturity
27. The secondary growth in plants is most prominent in:
a. Herbaceous plants
b. Annual plants
c. Perennial plants
d. Succulent plants
Answer: c. Perennial plants
28. Which of the following is NOT a factor influencing secondary growth in plants?
a. Age of the plant
b. Environmental conditions
c. Genetic factors
d. Availability of sunlight
Answer: d. Availability of sunlight
29. The cells of the cork layer are impregnated with a substance called:
a. Lignin
b. Cutin
c. Suberin
d. Cellulose
Answer: c. Suberin
30. The primary function of the secondary phloem is to:
a. Transport water and minerals
b. Provide structural support
c. Transport sugars and organic nutrients
d. Store food reserves
Answer: c. Transport sugars and organic nutrients
31. The outermost layer of the bark is called:
a. Vascular cambium
b. Cork cambium
c. Secondary phloem
d. Epidermis
Answer: d. Epidermis
32. The term "cork oak" refers to a tree species known for its:
a. Large leaves
b. Thick bark used in cork production
c. Fast growth rate
d. Vibrant flower colors
Answer: b. Thick bark used in cork production
33. The increase in stem girth during secondary growth is due to cell division in the:
a. Epidermis
b. Cortex
c. Vascular cambium
d. Pith
Answer: c.
Vascular cambium
34. The growth rings seen in the cross-section of a tree trunk are composed of:
a. Primary xylem
b. Primary phloem
c. Secondary xylem and phloem
d. Vascular cambium
Answer: c. Secondary xylem and phloem
35. Which of the following is NOT a type of meristem involved in secondary growth?
a. Apical meristem
b. Vascular cambium
c. Cork cambium
d. Interfascicular cambium
Answer: a. Apical meristem
36. The secondary phloem is located:
a. Towards the center of the stem
b. Towards the outermost layer of the stem
c. In between the primary xylem and primary phloem
d. In the pith region
Answer: b. Towards the outermost layer of the stem
37. The secondary xylem is primarily responsible for:
a. Sugar transport
b. Water transport
c. Photosynthesis
d. Hormone production
Answer: b. Water transport
38. The primary function of the secondary xylem is to:
a. Transport water and minerals
b. Provide structural support
c. Transport sugars and organic nutrients
d. Store food reserves
Answer: a. Transport water and minerals
39. The term "vessels" refers to:
a. Specialized cells responsible for sugar transport in the phloem
b. The actively dividing region of the meristem
c. Tubular structures in the xylem that transport water
d. Protective cells in the epidermis
Answer: c. Tubular structures in the xylem that transport water
40. The secondary growth in stems and roots is typically observed in:
a. Monocot plants
b. Dicot plants
c. Gymnosperm plants
d. Fern plants
Answer: b. Dicot plants
41. Which of the following is NOT a characteristic of secondary growth in plants?
a. Increase in plant girth
b. Formation of annual growth rings
c. Production of new leaves
d. Development of woody tissues
Answer: c. Production of new leaves
42. The cells of the secondary phloem are primarily responsible for:
a. Water absorption
b. Food storage
c. Hormone production
d. Sugar transport
Answer: d. Sugar transport
43. The cork cambium is derived from:
a. The primary meristem
b. The ground tissue
c. The primary xylem
d. The secondary phloem
Answer: a. The primary meristem
44. The term "interfascicular cambium" refers to:
a. The region between the primary xylem and primary phloem
b. The actively dividing region of the meristem
c. The region between the primary xylem and cork cambium
d. The region between the secondary xylem and secondary phloem
Answer: c. The region between the primary xylem and cork cambium
45. The term "ray cells" refers to:
a. Cells responsible for water transport in the xylem
b. Cells responsible for sugar transport in the phloem
c. Radial cells that transport water and nutrients across the stem
d. Cells found in the leaf epidermis
Answer: c.
Radial cells that transport water and nutrients across the stem
46. The secondary growth in plants is influenced by:
a. Environmental conditions
b. Hormones
c. Genetic factors
d. All of the above
Answer: d. All of the above
47. The term "cambium ring" refers to:
a. The layer of cork cells produced by the cork cambium
b. The annual growth rings in the secondary xylem
c. The region of actively dividing cells in the meristem
d. The layer of phloem cells produced by the vascular cambium
Answer: b. The annual growth rings in the secondary xylem
48. The secondary growth in roots contributes to:
a. Increase in root length
b. Increase in root width
c. Increase in leaf size
d. Increase in flower production
Answer: b. Increase in root width
49. The process of secondary growth in plants is initiated by:
a. Increased availability of sunlight
b. Hormonal signals
c. Environmental cues
d. Damage to the plant tissues
Answer: b. Hormonal signals
50. The secondary growth in stems and roots is more pronounced in:
a. Young plants
b. Old plants
c. Annual plants
d. Perennial plants
Answer: b. Old plants
51. The term "lenticels" refers to:
a. Specialized cells responsible for water transport in the xylem
b. The actively dividing region of the meristem
c. Corky structures in the bark that allow gas exchange
d. Protective cells in the epidermis
Answer: c. Corky structures in the bark that allow gas exchange
52. The cells of the secondary phloem are primarily:
a. Living at maturity
b. Dead at maturity
c. Responsible for gas exchange
d. Responsible for water transport
Answer: a. Living at maturity
53. The term "cork oak" is commonly associated with the production of:
a. Latex
b. Resins
c. Essential oils
d. Cork
Answer: d. Cork
54. The cork cambium is responsible for the production of:
a. Secondary xylem
b. Secondary phloem
c. Cork cells
d. Vascular tissue
Answer: c. Cork cells
55. The cells of the secondary xylem are primarily responsible for:
a. Sugar transport
b. Water transport
c. Photosynthesis
d. Hormone production
Answer: b. Water transport
56. The secondary growth in plants occurs due to the activity of:
a. Apical meristem
b. Lateral meristem
c. Intercalary meristem
d. Vascular cambium
Answer: b. Lateral meristem
57. The cork cambium is located in the:
a. Epidermis
b. Cortex
c. Xylem
d. Phloem
Answer: a. Epidermis
58. The term "heartwood" refers to:
a. The outermost layer of the stem
b. The central region of the stem composed of dead cells
c. The actively dividing meristem in the stem
d. The region where the xylem and phloem meet
Answer: b. The central region of the stem composed of dead cells
59. The annual growth rings in trees
are formed due to variations in:
a. Temperature
b. Light intensity
c. Water availability
d. All of the above
Answer: d. All of the above
60. The formation of annual growth rings is influenced by:
a. Temperature and humidity
b. Sunlight exposure
c. Soil composition
d. All of the above
Answer: d. All of the above
61. The process of secondary growth is regulated by:
a. Hormones such as auxin and cytokinin
b. Environmental factors such as light and temperature
c. Genetic factors
d. All of the above
Answer: c. Genetic factors
62. The outermost layer of the stem responsible for gas exchange and protection is called:
a. Xylem
b. Phloem
c. Epidermis
d. Cork
Answer: c. Epidermis
63. The cells of the cork layer are impregnated with a substance called:
a. Lignin
b. Cutin
c. Suberin
d. Cellulose
Answer: c. Suberin
64. The cork cambium gives rise to:
a. Secondary xylem
b. Secondary phloem
c. Cork cells
d. Vascular tissue
Answer: c. Cork cells
65. The process of secondary growth in plants is most active during:
a. Spring
b. Summer
c. Fall
d. Winter
Answer: b. Summer
66. The secondary growth in plants occurs due to the activity of:
a. Apical meristem
b. Lateral meristem
c. Intercalary meristem
d. Vascular cambium
Answer: b. Lateral meristem
67. The process of secondary growth occurs in which parts of the plant?
a. Leaves
b. Stems and roots
c. Flowers
d. Fruits
Answer: b. Stems and roots
68. The primary meristematic tissue responsible for secondary growth in roots is called:
a. Apical meristem
b. Vascular cambium
c. Cork cambium
d. Root cap
Answer: b. Vascular cambium
69. The secondary growth in roots results in the formation of:
a. Secondary xylem
b. Secondary phloem
c. Secondary cortex
d. Secondary epidermis
Answer: a. Secondary xylem
70. Which of the following is NOT a function of secondary phloem?
a. Transport of sugars and other organic nutrients
b. Provides mechanical support
c. Storage of food reserves
d. Forms part of the bark
Answer: b. Provides mechanical support
71. The cells of the secondary xylem are:
a. Living at maturity
b. Dead at maturity
c. Capable of photosynthesis
d. Responsible for water absorption
Answer: b. Dead at maturity
72. The secondary growth in roots contributes to:
a. Increase in root length
b. Increase in root width
c. Increase in leaf size
d. Increase in flower production
Answer: b. Increase in root width
73. The term "bark" refers to:
a. The secondary phloem, cork cambium, and cork layers
b. The outermost layer of the stem
c. The innermost layer of the
stem
d. The actively dividing region of the stem
Answer: a. The secondary phloem, cork cambium, and cork layers
74. The process of secondary growth in plants is initiated by:
a. Increased availability of sunlight
b. Hormonal signals
c. Environmental cues
d. Damage to the plant tissues
Answer: b. Hormonal signals
75. The cells of the cork layer are impervious to:
a. Water and nutrients
b. Carbon dioxide
c. Oxygen
d. Sunlight
Answer: a. Water and nutrients
76. The term "vascular cambium" refers to:
a. The actively dividing region of the stem
b. The outermost layer of the stem
c. The region where the xylem and phloem meet
d. The region of meristematic tissue that produces secondary xylem and phloem
Answer: d. The region of meristematic tissue that produces secondary xylem and phloem
77. The primary function of the cork cambium is to:
a. Produce new xylem cells
b. Produce new phloem cells
c. Produce new cork cells
d. Produce new epidermal cells
Answer: c. Produce new cork cells
78. The term "ray cells" refers to:
a. Cells responsible for water transport in the xylem
b. Cells responsible for sugar transport in the phloem
c. Radial cells that transport water and nutrients across the stem
d. Cells found in the leaf epidermis
Answer: c. Radial cells that transport water and nutrients across the stem
79. The increase in stem girth during secondary growth is due to cell division in the:
a. Epidermis
b. Cortex
c. Vascular cambium
d. Pith
Answer: c. Vascular cambium
80. The term "heartwood" refers to:
a. The outermost layer of the stem
b. The central region of the stem composed of dead cells
c. The actively dividing meristem in the stem
d. The region where the xylem and phloem meet
Answer: b. The central region of the stem composed of dead cells
81. The primary function of the secondary xylem is to:
a. Transport water and minerals
b. Provide structural support
c. Transport sugars and organic nutrients
d. Store food reserves
Answer: a. Transport water and minerals
Please note that the questions and answers provided are for educational purposes and may vary depending on specific contexts and sources.
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