General Science • BiologyHard
What is the primary functional significance of the Casparian strip located in the endodermal cell walls of roots in vascular plants?
A. It promotes rapid symplastic transport of water into the vascular cylinder
B. It acts as a waterproof barrier that prevents apoplastic water and mineral movement into the stele, forcing passage through the plasma membrane✓ Correct Answer
C. It provides mechanical rigidity to prevent root collapse under high soil compaction
D. It secretes digestive enzymes to break down organic matter in the rhizosphere
💡 Solution & Explanation
The Casparian strip is a band of suberin-impregnated cell wall material in the root endodermis that blocks the apoplastic pathway of water and solute movement. This forces water and dissolved ions to cross the selectively permeable plasma membrane of endodermal cells, allowing plants to regulate mineral uptake and exclude toxic substances. Symplastic movement through plasmodesmata remains unaffected by this suberized barrier. Endodermal selectivity is crucial for maintaining ionic homeostasis within the plant vascular system.
More General Science Biology questions
- What is the primary evolutionary and physiological significance of C4 photosynthetic pathway adaptations…
- What is the primary plant pigment responsible for absorbing light energy during photosynthesis, containing a…
- Which valve is located between the right atrium and the right ventricle in the human heart?
- Consider the following statements regarding human immunity: 1. B lymphocytes mature in the bone marrow and…
- What is the primary ecological role of mycorrhizal fungi forming symbiotic associations with vascular plant…