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In plants towards the centre of the root...

In plants towards the centre of the root, next to endodermis lies a few layers of thick - walled parenchymatous cell referred to as

A

Pith .

B

epidermis.

C

phloem.

D

pericycle

Text Solution

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The correct Answer is:
To solve the question, we need to identify the layers of thick-walled parenchymatous cells located next to the endodermis in the root of a plant. Here’s the step-by-step solution: ### Step-by-Step Solution: 1. **Understanding Root Structure**: - In a plant root, there are several layers of cells, each with specific functions. The endodermis is one of the innermost layers of the cortex, which regulates the flow of water and nutrients into the vascular system. 2. **Identifying the Layer Next to Endodermis**: - Next to the endodermis, there are a few layers of thick-walled parenchymatous cells. These cells provide structural support and can also play a role in storage. 3. **Recognizing the Correct Term**: - The specific layer of thick-walled parenchymatous cells located next to the endodermis is known as the **pericycle**. The pericycle is crucial for the formation of lateral roots and can also contribute to the secondary growth of the root. 4. **Evaluating the Options**: - **Option 1: PIT** - Incorrect, as PIT refers to structures involved in nutrient storage and transport, not the thick-walled cells next to the endodermis. - **Option 2: Epidermis** - Incorrect, as the epidermis is the outermost layer of the root and consists of a single layer of cells. - **Option 3: Phloem** - Incorrect, as phloem is involved in the transport of sugars and is located within the vascular tissue, not next to the endodermis. - **Option 4: Pericycle** - Correct, as it accurately describes the layer of thick-walled parenchymatous cells next to the endodermis. 5. **Conclusion**: - The correct answer to the question is **pericycle**.
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Read the following characteristics (I - IV) and identify the structure to which these features correspond I. Cortex is made up of several layers of thin walled parenchyma cells without any intercellular spaces. II Endoderm is made up of a single layer of barrel - shaped cells without any intercellular spaces. III . Few layers of thick - walled parenachymatous cell forms pericycle. IV. Pith is small or inconspicuous. V. Conjunctive tissue present , and 2 to 4 xylem and phloem patches.

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Knowledge Check

  • Read the following statement with 1-2 blanks in each one of them: (i) In monocot root, a large number of vascular bundles are arranged in the form of a ______around the central _______. (ii) Due to the presence of ______,the endodermal cells do not allow wall to wall movement of substances between cortex and pericycle, in primary dicot root. (iii) The epidermis of stem of sunflower bears several unbranched _____hair. (iv) The central portion of a dicot stem is usually occupied by_____comprising of thin-walled parenchymatous cells. Select the option that correctly fills the blanks in any two of them

    A
    (i) ring, pith, (ii) hypodermis
    B
    (ii) casparian strips, (iii) unicellular
    C
    (i) ring, convex, (iv) vasuclar bundles
    D
    (iii) multicellular, (iv) pitch

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