Morphology Of Flowering Plants – NEET UG BiologyPractice Questions & PYQs

The floral formula featuring radial symmetry, bisexual structures, five fused sepals, five fused petals, five stamens, and a bicarpellary superior ovary uniquely identifies the Solanaceae family. Tracing the given choices to their respective botanical classifications shows that only Petunia falls under Solanaceae, whereas Sesbania, Brassica, and Allium belong to Fabaceae, Brassicaceae, and Liliaceae respectively.

Axile placentation develops when a multilocular ovary partitions its interior space with septa, allowing ovules to attach directly to rum-central column where the partitions meet. This structural configuration is readily visible in multicarpellary, syncarpous fruits and vegetables such as lemons, oranges, and tomatoes. Meanwhile, other plants utilize different arrangements, such as marginal placentation in peas, parietal placentation in Argemone, and free central placentation in Dianthus.

Aestivation describes the specific arrangement of sepals or petals in a floral bud relative to one another. When the floral appendages overlap irregularly without a strict clockwise or counterclockwise direction, the aestivation is classified as imbricate.

Cereals like maize possess grains where the endosperm is permanently retained and enveloped by a specialized, protein-rich boundary known as the aleurone layer. This distinct cellular layer plays a crucial role in mobilizing nutrient reserves during seed germination.

Modified underground stems often serve as storage organs for plants, featuring distinct nodes, internodes, and scale leaves with buds. A potato is a modified tuber that acts as an underground stem storage structure, unlike roots such as carrots or sweet potatoes.

The botanical structure of a berry involves a fleshy fruit wall and a seed-bearing inner region that develop together into the edible pulp. In tomatoes, both the outer pericarp and the inner placental tissue swell and become juicy, forming the primary consumed parts of the fruit.

Hypogynous flowers are characterized by a superior ovary positioned above the attachment points of the sepals, petals, and stamens. Out of the twenty-one listed plants, exactly fifteen exhibit this superior floral arrangement, while the remaining six belong to epigynous or perigynous families.

A racemose inflorescence features an indefinite main axis where the terminal bud continues to grow vegetatively rather than terminating in a flower. Flowers develop in an acropetal succession with older blossoms positioned near the base and younger buds situated toward the apex. Among the choices provided, soybean belongs to the family Fabaceae, which characteristically exhibits this indefinite flowering pattern.

Actinomorphic symmetry allows a flower to be divided into two identical halves along any radial plane passing through its center. Hypogynism refers to a floral architecture where the gynoecium occupies the highest terminal position while sepals, petals, and stamens are inserted below it. Twisted aestivation describes petals overlapping one another in a regular circular direction where one margin of each petal covers the adjacent one.

Opposite phyllotaxy describes a leaf arrangement pattern where a pair of leaves arises at the exact same node on directly opposite sides of the stem. Examining the listed species, Ocimum, guava, and Calotropis distinctly showcase this opposing pair configuration. The remaining plants in the group utilize alternative strategies, such as alternate leaf insertion in China rose, sunflower, and mustard, or whorled placement in Alstonia and Nerium.

Cymose inflorescence represents a determinate growth pattern where the main floral axis stops lengthening because its terminal bud transforms directly into a flower. Consequently, further growth is restricted to lateral branches which subsequently repeat this terminating process. This arrangement produces a basipetal succession where the oldest flower sits at the apex while younger buds develop below.

Valvate aestivation is characterized by floral appendages such as petals or sepals that merely touch each other along their margins without any overlapping. Evaluating the given list, Calotropis, tulip, Asparagus, Colchicum, Petunia, mustard, and tobacco exhibit this specific non-overlapping arrangement. In contrast, legumes like Sesbania, sweet pea, Indigofera, soybean, and groundnut display vexillary aestivation instead.

Placentation refers to the specific manner in which ovules are arranged inside the ovary cavity, with marginal placentation uniquely forming a ridge along the ventral suture of a unilocular ovary. Members of the legume family systematically display this characteristic trait, where seeds are attached in a single linear row along the margin. Examining the provided list reveals that gram, arhar, sun hemp, moong, pea, and lupin all belong to this botanical family, bringing the total count to six.

A composite or multiple fruit originates from an entire cluster of flowers organized as an inflorescence rather than a single flower. Evaluating the provided list, fig develops through a syconus structure from a specialized inflorescence, while both pineapple and mulberry form sorosis fruits from compact spike inflorescences. The remaining plants on the list develop from individual flowers, bringing the total count of plants with composite fruits to three.

The coconut fruit develops from a monocarpellary superior ovary into a drupe where the internal seed cavity contains both liquid and solid nutritive tissue. During development, free-nuclear divisions of the primary endosperm nucleus create a watery fluid rich in growth hormones, while subsequent cellularization around the periphery forms the white, oily edible meat. Both components are fundamentally different manifestations of the same nutritive tissue that nourishes the developing plant embryo.

A phyllode is a modified, flattened petiole or rachis that takes over the primary photosynthetic function when the leaf lamina fails to develop or drops early. This adaptation heavily minimizes water loss in arid environments by orienting vertically and reducing stomatal density. Species belonging to Australian Acacia utilize this exact structural modification to survive harsh desert climates.

A cymose inflorescence is characterized by terminal flower growth on the main axis, which restricts its elongation and forces lateral axes to continue development. This determinate growth pattern results in a basipetal arrangement where older flowers lie at the top and younger ones develop below. Solanum prominently displays this specialized floral arrangement among the given choices.

Axile placentation occurs when the ovary is partitioned into multiple chambers and ovules attach to the central multilocular axis. This structural arrangement is characteristic of syncarpous ovaries where septa grow inward to meet at the center. Plants like China rose, tomato, and lemon clearly exhibit this multichambered condition with central ovule attachment.

An apocarpous gynoecium features multiple carpels that remain completely distinct and unmerged within the same flower. Because the pistils are entirely separate from one another, each carpel functions as an independent unit containing its own stigma, style, and ovary. This distinct structural condition is classically observed in flowers like Michelia, contrasting sharply with syncarpous types where fusion occurs.

Underground modified stems known as bulbs serve as perennating organs for perennial monocots, which simultaneously exhibit overlapping floral segments arranged in an imbricate pattern. Within the ovary of these plants, ovules attach along central partitions inside multichambered compartments, characterizing the axile placentation type. This specific triad of structural features accurately describes the morphological traits observed in the genus Allium.