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 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.
A unique feature of phloem parenchyma is its absence in:
Monocots
Dicots
Gymnosperms
Pteridophytes
Which of the following combinations of cell types are exclusively found in complex tissues and not simple tissues?
Sieve tubes, companion cells, and tracheids
Parenchyma, collenchyma, and sclerenchyma
Xylem parenchyma, phloem parenchyma, and sclereids
Tracheids, vessels, and xylem fibres
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
The 'Hadrome' in plants specifically refers to:
The xylem tissue specialized for water conduction
The phloem tissue specialized for nutrient transport
The ground tissue responsible for storage and support
The meristematic tissue capable of cell division
In a conjoint, collateral, and open vascular bundle, which tissue separates the xylem and phloem?
Cambium
Pith
Cortex
Pericycle
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
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
Which specific characteristic of bordered pits in xylem tracheids facilitates the unidirectional flow of water while also preventing the spread of air embolisms?
Thickened secondary cell walls surrounding the pits
Presence of a torus and a flexible pit membrane
Overlapping arrangement of tracheids
Presence of tyloses within the tracheids
