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.
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
The protoxylem and metaxylem in a plant stem differ primarily in:
Their cellular composition (tracheids vs. vessel elements)
The timing of their differentiation and the extent of secondary wall thickening
Their location within the vascular bundle
Their function in water transport versus nutrient transport
Which of the following BEST explains why the ascent of sap in tall trees is primarily attributed to the cohesion-tension theory rather than root pressure?
Root pressure only operates during the night
Root pressure is primarily involved in nutrient transport, not water transport
Root pressure alone cannot generate sufficient pressure to overcome the gravitational force in tall trees
The cohesion-tension theory is more energy-efficient than root pressure
How does the arrangement of cellulose microfibrils in the secondary cell walls of xylem vessels contribute to their function?
Facilitates rapid water flow through the vessel lumen
Increases the flexibility of the vessel walls
Provides strength and prevents collapse under negative pressure
Regulates the passage of ions and nutrients into the xylem sap
Which of the following statements regarding the casparian strip is INCORRECT?
It is a band of hydrophobic material that surrounds the radial and transverse walls of endodermal cells.
It forces water and solutes to enter the symplast, regulating their passage into the stele.
It is composed primarily of lignin and suberin, providing structural support to the endodermis.
Its presence in the root endodermis helps prevent the apoplastic movement of water and minerals.
A unique characteristic of lateral meristems is their ability to:
Contribute to the elongation of the plant axis
Increase the girth of the plant
Give rise to the primary plant body
Differentiate into the root cap
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
The periderm, a complex tissue that replaces the epidermis in older stems and roots of woody plants, comprises which of the following tissues?
Phellem, phellogen, and phelloderm
Epidermis, cortex, and endodermis
Xylem, phloem, and vascular cambium
Parenchyma, collenchyma, and sclerenchyma
Specialized parenchyma cells containing chloroplasts and found in the mesophyll of leaves are known as:
Aerenchyma
Chlorenchyma
Sclerenchyma
Collenchyma
Which of the following is NOT a characteristic of complex permanent tissues?
Made up of more than one type of cell
Involved in transport of water and nutrients
Composed of only one type of cell
Examples include xylem and phloem
