Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following plant tissues is responsible for providing flexibility to plants and is characterized by thickened corners?
Parenchyma
Collenchyma
Sclerenchyma
Xylem
Collenchyma
Collenchyma is a simple permanent plant tissue that provides mechanical support and flexibility to young, growing plant parts. It is characterized by uneven cell wall thickening, specifically at the corners, due to the deposition of pectin, cellulose, and hemicellulose.
Collenchyma is a simple permanent plant tissue that provides mechanical support and flexibility to young, growing plant parts. It is characterized by uneven cell wall thickening, specifically at the corners, due to the deposition of pectin, cellulose, and hemicellulose.
Think of collenchyma like the elastic joints or rubber gaskets in a structure; they hold parts together firmly but remain flexible enough to allow movement without breaking.
COLlenchyma = COLumns of flexibility (or Corners Of Lignin-less thickening)
Cell┬аwall┬аcomponent=Cellulose+Hemicellulose+Pectin
The flexibility arises because the cells are living and possess primary cell walls that are thickened only at specific regions (the corners). This structural arrangement allows the tissue to provide tensile strength while remaining elastic enough to permit the growth and bending of stems and petioles without snapping under stress.
Cells are living at maturity with protoplasm.
Thickening occurs primarily due to pectin deposition at the intercellular spaces (corners).
It is primarily found in the hypodermis of dicot stems and leaf stalks (petioles).
It is absent in monocots and roots.
Provides mechanical support without restricting growth.
Allows bending without fracturing.
Cannot provide the extreme rigidity required for woody, mature tree trunks.
Support in young herbaceous stems.
Structural integrity in leaf petioles.
Parenchyma provides storage and photosynthesis.
Sclerenchyma provides hard, rigid support and is dead at maturity (due to high lignin content).
Xylem is a complex tissue involved in the transport of water and dissolved minerals.
B is correct тАФ Collenchyma is specifically adapted for flexibility and growth due to its unevenly thickened cell walls containing pectin.
Always remember: Collenchyma is living and flexible, whereas Sclerenchyma is dead and rigid (due to lignin). This distinction is a frequent target for competitive exam questions.