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.
The pericycle in roots contributes to the formation of which of the following structures, EXCLUDING:
Lateral roots
Vascular cambium
Cork cambium
Root cap
The concept of 'Dedifferentiation' in relation to meristem formation is best exemplified by:
Activity of the root apical meristem
Formation of interfascicular cambium from parenchyma cells
Development of phellogen from the epidermis
Differentiation of xylem vessels from procambium
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
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
In a conjoint, collateral, and open vascular bundle, which tissue separates the xylem and phloem?
Cambium
Pith
Cortex
Pericycle
A researcher is studying the transport of water in a genetically modified plant where the lignin biosynthesis pathway is disrupted. Which of the following is the MOST likely consequence observed in the xylem of this plant?
Increased tensile strength of xylem vessels and enhanced water transport
Collapsed xylem vessels and reduced water transport efficiency
No significant change in xylem structure or water transport
Increased flexibility of xylem vessels and improved water transport under stress
In a plant experiencing severe drought, which adaptation related to xylem anatomy would MOST effectively minimize the risk of cavitation?
Wider xylem vessels for increased water storage
Thinner xylem walls for increased flexibility
Narrower xylem vessels with thicker walls
Increased number of bordered pits for inter-vessel water transfer
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 specific plasmodesmatal characteristic is crucial for the symplastic loading of sucrose into the phloem's sieve element-companion cell complex?
Absence of plasmodesmata between companion cells and sieve elements
Uniformly distributed plasmodesmata with a low density throughout the phloem
Branched plasmodesmata with a high density between companion cells and bundle sheath cells
Numerous plasmodesmata between companion cells and surrounding parenchyma cells, but few between companion cells and sieve elements
The 'polymer trapping' model explains phloem loading by suggesting that sucrose is converted into larger molecules in which specific cell type?
Sieve elements
Companion cells
Phloem parenchyma cells
Bundle sheath cells
