Secondary Medullary Rays
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Q. Secondary medullary rays are produced by-
- Fusiform initials
- Interfascicular cambium
- Phellogen
- Ray initials
Q. Choose the correct statement with respect to medullary rays.
- Medullary rays may be parenchymatous or collenchymatous in nature
- Primary medullary rays are present inside primary vascular bundles
- Secondary medullary rays are formed by the cork cambium
- They help in radial conduction of food and water
Q. Which of the following is responsible for the formation of secondary medullary rays?
a = spiral trachea, b = annular trachea, c = scalariform trachea, d = reticulate tracea, e = simple pitted trachea, f = bordered pitted trachea
a = annular trachea, b = spiral trachea, c = reticulate trachea, d = scalariform trachea, e = simple pitted trachea, f = bordered pitted trachea
a = annular trachea, b = spiral trachea, c = scalariform trachea, d = reticulate trachea, e = simple pitted trachea, f = bordered pitted trachea
a = annular trachea, b = spiral trachea, c = scalariform trachea, d = simple pitted trachea, e = reticulate trachea, f = bordered pitted trachea
Q. Which of the following is responsible for the formation of secondary medullary rays?
- Growth of secondary xylem
- Growth of Cambium through secondary xylem and seoondary phloem
- Growth of secondary phloem into secondary xylem
- None of the above
Q. Which one of the following is an incorrect comparison between tracheids and vessels?
- Tracheids - narrow lumen, Vessels - broad lumen
- Tracheids - usually have bordered pits, Vessels - usually possess simple pits
- Tracheids - end walls of cells are dissolved, Vessels - tapering ends
- Tracheids - unicellular, Vessels - multicellular
Q. Which of the following is responsible for the formation of secondary medullary rays?
- Growth of secondary xylem
- Growth of Cambium through secondary xylem and seoondary phloem
- Growth of secondary phloem into secondary xylem
- None of the above
Q. Choose the correct statement with respect to medullary rays.
- Medullary rays may be parenchymatous or collenchymatous in nature
- Secondary medullary rays are formed by the cork cambium
- They help in radial conduction of food and water
- Primary medullary rays are present inside primary vascular bundles
Q. Choose the correct statement with respect to medullary rays.
- Medullary rays may be parenchymatous or collenchymatous in nature
- Primary medullary rays are present inside primary vascular bundles
- Secondary medullary rays are formed by the cork cambium
- They help in radial conduction of food and water
