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- #National Eligibility Cum Entrance Test
- #Medical
- #Class 11
- #Structural Organisation in Animals and Plants
- #Biology
- #National Eligilibility Cum Entrance Test
Tissue commonly known as passport point or biological check post is characterized by
Bulliform cells and raphides
Cystolith and motor cells
Casparian bands and passage cells
Passage cells and Fats
Answers (1)
The endodermis is a specialized tissue found in the roots of vascular plants. It is commonly referred to as the "passport point" or "biological check post" because of its important role in controlling the movement of substances into and out of the vascular cylinder of the root.
One of the key features of the endodermis is the presence of Casparian bands. These are specialized, waterproof strips made of suberin—a waxy substance. Casparian bands encircle each cell of the endodermis, creating a barrier that prevents the movement of water and solutes through the cell walls. This forces substances to pass through the cytoplasm of the endodermal cells, ensuring selective uptake of minerals and water.
Adjacent to the cells with Casparian bands, there are specialized cells called passage cells. Passage cells are characterized by having thinner cell walls and larger spaces between them. These cells provide a pathway for the movement of water and dissolved substances around the Casparian bands, enabling them to bypass the endodermal barrier.
Together, the Casparian bands and passage cells of the endodermis regulate the movement of water and nutrients into the vascular tissue of the root. They help maintain the selective uptake of essential minerals and ions while preventing the entry of harmful substances.
Hence, the correct answer is option 3.
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