Module: | Double Fertilization & Endosperm
Q82: Consider the following statements regarding the structural anatomy of solid styles:
1. In angiosperms with solid styles, the central core is filled with a specialized tract of cells known as the transmission tissue.
2. The cells of the transmission tissue secrete pectinases and nutrient-rich mucilage to facilitate the intercellular growth of the pollen tube.
3. Hollow styles, by contrast, completely lack any form of chemical exudate or structural guidance for the growing pollen tube.
Which of the above statements is/are correct?
2. The cells of the transmission tissue secrete pectinases and nutrient-rich mucilage to facilitate the intercellular growth of the pollen tube.
3. Hollow styles, by contrast, completely lack any form of chemical exudate or structural guidance for the growing pollen tube.
Which of the above statements is/are correct?
✅ Correct Answer: A
The correct option is A. Statements 1 and 2 are correct, but Statement 3 is incorrect.
The style connects the stigma to the ovary and comes in two primary anatomical forms: solid and hollow.
In most dicots, the style is solid.
To allow pollen tubes to pass, the core of the style contains a specialized strand of elongated cells called the transmission (or transmitting) tissue.
Causally, the pollen tubes do not pierce these cells; instead, they grow intercellularly through the middle lamella.
The transmission tissue secretes enzymes (like pectinases) and mucopolysaccharides that loosen the cell walls and nourish the descending tube.
Statement 3 is a botanical error.
Hollow styles (common in monocots like lilies) possess a central canal lined with specialized glandular canal cells.
These cells secrete a rich mucilaginous exudate into the hollow space, providing essential chemical guidance and nutrition identical in purpose to the solid transmission tissue.
The style connects the stigma to the ovary and comes in two primary anatomical forms: solid and hollow.
In most dicots, the style is solid.
To allow pollen tubes to pass, the core of the style contains a specialized strand of elongated cells called the transmission (or transmitting) tissue.
Causally, the pollen tubes do not pierce these cells; instead, they grow intercellularly through the middle lamella.
The transmission tissue secretes enzymes (like pectinases) and mucopolysaccharides that loosen the cell walls and nourish the descending tube.
Statement 3 is a botanical error.
Hollow styles (common in monocots like lilies) possess a central canal lined with specialized glandular canal cells.
These cells secrete a rich mucilaginous exudate into the hollow space, providing essential chemical guidance and nutrition identical in purpose to the solid transmission tissue.