Question

Name the chemical present in angular thickening of collenchyma.
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Answer 1

Answer:

Collenchyma is a type of plant tissue in which cells are elongated in shape with the irregularly thickened primary cell wall. It provides mechanical support to the plant.

Collenchymatous cells are present at the periphery of herbaceous stems, petioles and the ribs of some leaves. They are also present in floral parts, fruits and aerial roots.,

Collenchyma develops from the ground meristem or procambium.

Types of collenchyma are

(a) Angular: The thickening materials deposit at the angles or corners of the cells where several cells meet e.g., petioles of Cucurbita, beta etc.

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(b) Lamellar: The thickening material deposits heavily on the tangential walls of the cell than the radial walls e.g. stem of Sambucus.

(c )Lacunar : The thickening material deposits at those places of the cell wall which are in direct contact with the intercellular spaces. e,g, petioles of Salvia, Malva.

(d) Annular: In this type, the cell lumen more or less appears to be circular. This is mature tissue where cell shape changes with heavy deposits of pectin and hemicellulose in walls.

Thus, the correct answer is option D

Answer 2

Answer:

Collenchyma cells are simple permanent tissue composed of similar types of cells.Their thick cell walls are composed of the compounds cellulose and pectin. These provide strength, and rigidity to the cell.

Explanation:

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