Home
Class 11
BIOLOGY
Assertion. The radial walls of endoderma...

Assertion. The radial walls of endodermal cells possess a conspicuous waxy thickening called Casperian strip.
Reason. Casparian thickenings block the passage of solute from one side of endodermis to the other via cell wall route.

A

If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion

B

If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion

C

If Assertion is true but the Reason is false

D

If both Assertion and Reason are false

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Assertion**: The assertion states that the radial walls of endodermal cells possess a conspicuous waxy thickening called the Casparian strip. This is true as the Casparian strip is indeed a characteristic feature of endodermal cells in plants. 2. **Understanding the Reason**: The reason provided states that Casparian thickenings block the passage of solute from one side of the endodermis to the other via the cell wall route. This is also true because the Casparian strip creates a barrier that prevents the passive movement of solutes through the cell walls, thereby forcing substances to enter the cells instead. 3. **Linking Assertion and Reason**: The assertion and reason are connected. The presence of the Casparian strip (assertion) is responsible for blocking the passage of solutes via the cell wall route (reason). This means that the reason is a correct explanation of the assertion. 4. **Conclusion**: Since both the assertion and the reason are true, and the reason correctly explains the assertion, the correct answer is that both statements are true and the reason is a correct explanation of the assertion. **Final Answer**: Option A: Both assertion and reason are true, and the reason is the correct explanation of the assertion. ---
Promotional Banner

Topper's Solved these Questions

  • ANATOMY OF FLOWERING PLANTS

    PRADEEP|Exercise PRACTICE QUESTIONS (MULTIPLE CHOICE QUESTION)|83 Videos

  • ANIMAL KINGDOM

    PRADEEP|Exercise Assertion-Reason Type Questions|44 Videos

Similar Questions

Explore conceptually related problems

Why the endodermal cells possess casparian strips in their radial and transverse walls ?

Assertion (A). In cardiac muscles , impulses are transmitted rapidly . Reason (R) . Gap junctions allow quick passage of ions from one cell to the other.

assertion (A). All the endodermal cells of the root do not contain casparian thickenings on their radial walls and transverse walls. Reason ®.passage cells are found in endodermis.

Assertion : collenchyma is thick walled dead tissue Reason: collenchymatous cells show thickening of pectin

Assetion: The stmatal pore, guard cells and the surrounding subsidiary cells are tohether called stomatal aperture. Reason: The outer walls of guard cells (alway from stomatal pore) are highly thickened and the inner walls (towards the stomatal pore ) are thin

Assertion :- Apoplast, the system of adjacent cell walls is not continuous throughout plant. Reason:- It is interrupted by lignified casparian strips

Read the passage given below and answer the question: Polysaccharides may be very large molecules. Starch, glycogen, cellulose, and chitin are examples of polysaccharides. Starch is the stored form of sugars in plants and is made up of amylose and amylopectin (both polymers of glucose). Amylose is soluble in water and can be hydrolyzed into glucose units breaking glycocidic bonds, by the enzymes a- amylase and B-amylase. It is straight chain polymer. Amylopectin is a branched chain polymer of several D-glucose molecules. 80% of amylopectin is present in starch. Plants are able to synthesize glucose, and the excess glucose is stored as starch in different plant parts, including roots and seeds. The starch that is consumed by animals is broken down into smaller molecules, such as glucose. The cells can then absorb the glucose. Glycogen is the storage form of glucose in humans and other vertebrates, and is made up of monomers of glucose. It is structurally quite similar to amylopectin. Glycogen is the animal equivalent of starch. It is stored in liver and skeletal muscles. Cellulose is one of the most abundant natural biopolymers. The cell walls of plants are mostly made of cellulose, which provides structural support to the cell. Wood and paper are mostly cellulosic in nature. Like amylose, cellulose is a linear polymer of glucose. Cellulose is made up of glucose monomers that are linked by bonds between particular carbon atoms in the glucose molecule.Every other glucose monomer in cellulose is flipped over and packed tightly as extended long chains. This gives cellulose its rigidity and high tensile strength-which is so important to plant cells. Cellulose passing through our digestive system is called dietary fiber. (Source: "https://chem.libretexts.org" ) Amylose is :

Read the passage given below and answer the question: Polysaccharides may be very large molecules. Starch, glycogen, cellulose, and chitin are examples of polysaccharides. Starch is the stored form of sugars in plants and is made up of amylose and amylopectin (both polymers of glucose). Amylose is soluble in water and can be hydrolyzed into glucose units breaking glycocidic bonds, by the enzymes a- amylase and B-amylase. It is straight chain polymer. Amylopectin is a branched chain polymer of several D-glucose molecules. 80% of amylopectin is present in starch. Plants are able to synthesize glucose, and the excess glucose is stored as starch in different plant parts, including roots and seeds. The starch that is consumed by animals is broken down into smaller molecules, such as glucose. The cells can then absorb the glucose. Glycogen is the storage form of glucose in humans and other vertebrates, and is made up of monomers of glucose. It is structurally quite similar to amylopectin. Glycogen is the animal equivalent of starch. It is stored in liver and skeletal muscles. Cellulose is one of the most abundant natural biopolymers. The cell walls of plants are mostly made of cellulose, which provides structural support to the cell. Wood and paper are mostly cellulosic in nature. Like amylose, cellulose is a linear polymer of glucose. Cellulose is made up of glucose monomers that are linked by bonds between particular carbon atoms in the glucose molecule.Every other glucose monomer in cellulose is flipped over and packed tightly as extended long chains. This gives cellulose its rigidity and high tensile strength-which is so important to plant cells. Cellulose passing through our digestive system is called dietary fiber. (Source: "https://chem.libretexts.org" ) Which biopolymer breaks down to release glucose , whenever glucose levels drop in Our body: