Consider the following statements about 'Collenchyma': 1. It is found in the roots of the plant. 2. The cells are living, elongated, and irregularly thickened at the corners. 3. It has very little intercellular space. Which of the statements given above are correct?

The correct option is (c) 2 and 3 only. Explanation Collenchyma is a simple permanent tissue composed of living cells. It provides mechanical support and flexibility to the growing parts of the plant, such as young stems and the petiole of a leaf. - Statement 1 is Incorrect: Collenchyma is typically found in the hypodermis of dicot stems and in leaf stalks (petioles). It is generally absent in the roots of plants. It is also usually absent in monocots. - Statement 2 is Correct: The cells of collenchyma are living at maturity and are usually elongated. A defining characteristic is that their cell walls are irregularly thickened at the corners due to the deposition of cellulose, hemicellulose, and pectin. - Statement 3 is Correct: Due to the thickening at the corners, collenchyma cells are compactly arranged and typically have very little or no intercellular spaces. Key Takeaway: Collenchyma is a mechanical tissue consisting of living, elongated cells with unevenly thickened walls (rich in pectin) at the corners, primarily found in the aerial parts of dicots.

Consider the following statements about 'Collenchyma': 1. It… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 2: Tissues

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Consider the following statements about 'Collenchyma':

It is found in the roots of the plant.
The cells are living, elongated, and irregularly thickened at the corners.
It has very little intercellular space.

Which of the statements given above are correct?

NCERT textbook question

From NCERT Science - class 9 · Page 62

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c) 2 and 3 only.

Explanation

Collenchyma is a simple permanent tissue composed of living cells. It provides mechanical support and flexibility to the growing parts of the plant, such as young stems and the petiole of a leaf.

Statement 1 is Incorrect: Collenchyma is typically found in the hypodermis of dicot stems and in leaf stalks (petioles). It is generally absent in the roots of plants. It is also usually absent in monocots.
Statement 2 is Correct: The cells of collenchyma are living at maturity and are usually elongated. A defining characteristic is that their cell walls are irregularly thickened at the corners due to the deposition of cellulose, hemicellulose, and pectin.
Statement 3 is Correct: Due to the thickening at the corners, collenchyma cells are compactly arranged and typically have very little or no intercellular spaces.

Key Takeaway: Collenchyma is a mechanical tissue consisting of living, elongated cells with unevenly thickened walls (rich in pectin) at the corners, primarily found in the aerial parts of dicots.

Your note

More from Chapter 2: Tissues

Consider the following statements regarding 'Complex Permanent Tissues': 1. They are made of more than one type of cell. 2. Each cell in the tissue functions independently without coordination. 3. Xylem and Phloem are examples of complex tissues. Which of the statements given above is/are correct?

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Consider the following statements about epithelial tissue: 1. It forms a barrier to keep different body systems separate. 2. It is directly connected to the underlying tissue without any separating membrane. 3. It contains large intercellular spaces to facilitate the movement of materials. Which of the statements given above is/are correct?

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Consider the following statements about 'Smooth Muscles': 1. They are also known as striated muscles. 2. They control involuntary movements like the movement of food in the alimentary canal. 3. They are multinucleate. Which of the statements given above are correct?

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With reference to the fundamental differences between plants and animals, consider the following statements: 1. Plants have a large quantity of supportive tissue which generally consists of dead cells. 2. Growth in plants is uniform throughout the body, whereas in animals it is limited to specific regions. 3. Animals consume more energy compared to plants due to active locomotion. Which of the statements given above is/are correct?

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