Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Differentiating between a thyrse and a mixed inflorescence can be challenging. Which of the following statements BEST distinguishes a thyrse from a truly mixed inflorescence?
A thyrse always has a determinate main axis, while a mixed inflorescence always has an indeterminate main axis.
A thyrse has a cymose arrangement of racemose units, while a mixed inflorescence combines different inflorescence types randomly.
A thyrse always has brightly colored bracts, while a mixed inflorescence lacks bracts.
A thyrse has a racemose arrangement of cymose units, while a mixed inflorescence combines different inflorescence types in a less predictable pattern.
Consider a plant with a compound umbel inflorescence. If each ray of the main umbel bears a small, condensed cyme instead of a single flower, how would this modified inflorescence be BEST classified, and what advantage might this structure confer?
Cyme of umbels; enhanced seed dispersal
Compound raceme of umbels; protection from herbivores
Compound umbel of cymes; increased flower number and display area
Hypanthodium; trap for pollinators
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
In a particular angiosperm species, the development of the endosperm is initiated only after fertilization of the central cell. However, a mutation leads to autonomous endosperm development even without fertilization. Which of the following is the MOST likely consequence of this mutation?
Enhanced seed viability and germination rate
Formation of seeds with underdeveloped embryos or no embryos at all
Increased fruit size and seed number
Premature fruit ripening and abscission
A researcher observes a flower with a superior ovary, numerous stamens, and petals fused into a corolla tube. Based solely on these characteristics, to which of the following families does this flower MOST likely belong?
Liliaceae
Brassicaceae
Solanaceae
Fabaceae
Which of the following combinations of floral whorls is ALWAYS present in a complete flower, irrespective of its symmetry or sexuality?
Calyx, corolla, androecium, and gynoecium
Calyx and corolla only
Androecium and gynoecium only
Calyx, corolla, and androecium only
A plant species exhibits cleistogamous flowers alongside chasmogamous flowers. What is the PRIMARY advantage conferred by the cleistogamous flowers?
Increased genetic diversity through cross-pollination
Assured seed set even in the absence of pollinators
Attraction of a wider range of pollinators
Production of larger and more nutritious seeds
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
A mutant plant exhibits stunted root growth and reduced gravitropic response. Microscopic analysis reveals disorganized columella cells in the root cap. Which of the following is the MOST likely cause of this phenotype?
Increased production of cytokinin in the root tip
Disruption of amyloplast sedimentation and auxin redistribution
Overexpression of genes involved in cell elongation
Enhanced sensitivity to ethylene
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
