Prepare for NEET Biology Morphology of Flowering Plants with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert explanations of plant structures.
Which of the following statements regarding the anomalous secondary growth in Boerhaavia is INCORRECT?
A variant of cambium outside the vascular bundles
Concentric rings of secondary vascular bundles
Presence of medullary bundles
Inverted vascular bundles
A plant exhibiting Kranz anatomy experiences a sudden drop in atmospheric CO2 levels. Which of the following is the MOST LIKELY immediate consequence on its photosynthetic efficiency?
Reduced initial fixation of CO2 by PEP carboxylase in mesophyll cells.
Increased oxygenation of RuBisCO in bundle sheath cells.
Immediate cessation of the Calvin cycle in bundle sheath cells.
Enhanced activity of photorespiration in mesophyll cells.
Which structural feature of guard cells facilitates their function in stomatal regulation MOST effectively?
Uniformly thickened cell walls.
Radially oriented cellulose microfibrils in the cell walls.
Large central vacuole for water storage.
Presence of chloroplasts for photosynthesis.
A plant exhibits a unique inflorescence where the peduncle is flattened and bears sessile flowers in a centripetal fashion. Small, scaly bracts are present, and the oldest flowers are located at the periphery. This type of inflorescence is MOST accurately classified as a:
Cyathium
Hypanthodium
Capitulum
Verticillaster
A researcher observes an inflorescence where the main axis terminates in a flower, and further growth occurs through lateral branches, each of which also terminates in a flower. This pattern repeats multiple times. However, the flowers at each branching point are not at the same level. This inflorescence is BEST described as a:
Racemose
Umbel
Monochasium
Capitulum/Head
A rare orchid species exhibits a highly specialized pollination mechanism. Its labellum mimics the pheromones and appearance of a specific female wasp species, attracting the males for pseudocopulation. Which of the following floral adaptations is LEAST likely to be observed in this orchid?
Abundant nectar production within the spur
Precise positioning of pollen packets (pollinia) for attachment to the male wasp
Flower color and shape closely resembling the female wasp
Flowering period synchronized with the mating season of the wasp
A flower exhibits a pentamerous, actinomorphic perianth, a syncarpous gynoecium with a superior ovary, and ten stamens in two whorls. Which of the following floral formulas BEST represents this flower?
✶K5C5A5+5G(5)
✶K(5)C(5)A10G5
↑K5C5A10G(5)
✶K5C5A(5+5)G5
Which specific tissue within the root endodermis is primarily responsible for regulating the passage of water and minerals into the stele, and how does its structure facilitate this function?
Pericycle; its meristematic nature allows for selective uptake
Cortex; its large intercellular spaces facilitate diffusion
Casparian strip; suberin deposition in cell walls blocks apoplastic pathway
Phloem; its active transport mechanisms selectively move nutrients
A researcher observes that a particular plant species exhibits significantly reduced root hair development when grown in a hydroponic solution lacking phosphorus. Which physiological role of phosphorus in root hair formation is MOST likely affected?
Major component of cell wall cellulose
Cofactor for enzymes involved in lignin biosynthesis
Nucleic acid synthesis and energy transfer for cell division and elongation
Regulation of stomatal closure to prevent water loss
The symbiotic relationship between nitrogen-fixing bacteria and leguminous plants involves complex signaling and structural modifications in the root. Which of the following accurately describes the role of NOD factors in this interaction?
Plant hormones that promote bacterial growth within root nodules
Bacterial signals that trigger root hair curling and cortical cell division
Enzymes produced by the plant to break down bacterial cell walls
Proteins that transport nitrogen from bacteria to plant cells
