Prepare for NEET Biology Anatomy of Flowering Plants with MCQs & PYQs on NEET.GUIDE. Enjoy free practice, previous year questions, and expert insights on plant tissues and structures.
A scientist is studying a newly discovered plant species. Microscopic analysis of the stem reveals living cells with unevenly thickened cell walls, primarily composed of pectin and hemicellulose, providing flexible support. These cells lack lignin and are found in patches beneath the epidermis. Which tissue type is being observed?
Collenchyma
Sclerenchyma
Parenchyma
Xylem
Which of the following is NOT a characteristic feature of collenchyma cells?
Presence of lignin in cell walls
Unevenly thickened cell walls
Living cells at maturity
Provides flexible support to the plant
The flexibility of collenchyma tissue is primarily attributed to:
The presence of lignin in the cell wall
The thin cell walls
The combination of pectin and hemicellulose in the cell wall
The intercellular spaces present between the cells
In which specific plant structures would you LEAST expect to find collenchyma tissue?
Beneath the epidermis of young stems
In the petioles of leaves
Supporting the veins of leaves
Mature vascular bundles of woody stems
A mutation in a plant prevents the proper synthesis of pectin. Which tissue would be MOST directly affected by this mutation and what would be the primary consequence?
Sclerenchyma; decreased rigidity in mature tissues
Parenchyma; reduced storage capacity
Collenchyma; reduced flexible support in growing regions
Xylem; impaired water transport
Which statement BEST describes the relationship between collenchyma and sclerenchyma?
Both are composed of living cells at maturity.
Both have evenly thickened cell walls.
Both contain lignin in their cell walls.
Both provide structural support, but collenchyma provides flexible support in growing regions while sclerenchyma provides rigid support in mature regions.
Which tissue system is primarily responsible for providing mechanical strength and flexibility to plants, enabling them to withstand various environmental stresses like wind and bending?
Parenchyma
Collenchyma
Sclerenchyma
Xylem
Which of the following is a characteristic feature of collenchyma cells?
Thickened cell walls at the corners
Uniformly thickened cell walls
Presence of lignin in cell walls
Dead at maturity
Collenchyma tissue is primarily involved in providing what to plants?
Flexible support
Storage of food
Transport of water
Photosynthesis
Where is collenchyma tissue typically found in a plant?
Beneath the epidermis in young stems and petioles
In the center of the stem
In the root cortex
In mature, woody stems
