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 unique feature of the quiescent center in root apical meristem is its:
High mitotic activity and contributes to root cap formation
Low mitotic activity and acts as a reserve
High metabolic activity and synthesizes growth hormones
Absence of cell division and undergoes programmed cell death
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
The protoxylem and protophloem in a dicot stem differ primarily in their:
Maturation time and position relative to the metaxylem and metaphloem
Cell wall composition and function
Presence or absence of living cells at maturity
Overall size and shape of their conducting elements
Which specific characteristic of tyloses contributes to the blockage of xylem vessels in heartwood?
Protrusion of parenchyma cells into vessel lumens
Deposition of lignin in the vessel walls
Accumulation of tannins and resins
Collapse of vessel elements due to negative pressure
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 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 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
Which P-protein configuration within a damaged sieve element is MOST directly responsible for preventing excessive sap loss?
P-protein dispersing throughout the sieve element lumen
P-protein degrading into amino acids
P-protein lining the sieve element cell wall
P-protein forming a 'plug' at the sieve plate pores
In which specific cellular location are the informational molecules, such as RNA and proteins, that are transported via the phloem, synthesized?
Sieve elements
Companion cells
Phloem parenchyma cells
Xylem parenchyma cells
