Botany and Plant Science

Acropetal succession means flowers open from base (older) to apex (younger). Basipetal is opposite (apex to base). Centrifugal refers to development from center outward, not opening sequence. 'Either' creates ambiguity about basipetal vs centrifugal.

Anisomerous flowers have unequal numbers of parts in different floral whorls (e.g., 5 sepals, 4 petals). Isomerous flowers have equal numbers (e.g., 5 sepals, 5 petals). Pentamerous (5 parts) and tetramerous (4 parts) are specific isomerous types.

Zygomorphic flowers have bilateral symmetry - only one plane can divide them into mirror halves (orchids, peas). Actinomorphic flowers have radial symmetry with multiple planes. Polygamous means having both bisexual and unisexual flowers. Perianth refers to calyx+corolla.

A compound leaf's blade is divided into leaflets (pinnae is the technical term). 'Leaf-lets' is the common descriptive spelling. Rachis is the central axis of compound leaf. Option D 'either (1) or (2)' correctly allows both common and technical terms.

Suckers are lateral branches that develop from axillary buds on the underground part of the stem. They grow upward from the base of the plant and can form new clonal plants. Climbers and twiners are climbing strategies, while herbs refer to non-woody plants - none specifically describe underground lateral branches.

In compound leaves, the term 'pinna' (plural: pinnae) refers to the individual leaflets that make up the compound leaf. The main leaf is the entire compound structure, the rachis is the central axis, and feather is the literal meaning of the Latin word pinna, not the anatomical structure.

The word 'pinna' comes from Latin, meaning 'feather' or 'wing'. In compound leaves, pinnae (leaflet divisions) are arranged like the barbs of a feather. This etymology reflects the feather-like appearance of pinnately compound leaves, where leaflets are arranged along both sides of a central rachis.

Dichlamydeous flowers possess both accessory whorls: the calyx (outer whorl of sepals) and the corolla (inner whorl of petals). The prefix 'di-' means two, referring to these two accessory whorls. Monochlamydeous flowers have only one, and achlamydeous flowers lack both. Diadelphous refers to stamen fusion, not whorls.

Clitoria (commonly known as butterfly pea) has pinnately compound leaves, where leaflets are arranged in pairs along a central rachis. This leaf type is characteristic of many legumes. Palmately compound leaves have leaflets radiating from a single point, and heterophyllous refers to plants with different leaf shapes on the same plant.

A thyrsus is an inflorescence type where simple cymes (compound dichasial cymes) are arranged in a racemose manner along the main axis. Verticillaster has clusters in verticils, monochasial has single lateral branches, and hypanthodium is a flask-shaped receptacle found in fig.

Leucas aspera (Thumba) exhibits verticillaster inflorescence, where flowers appear in clusters at the nodes forming whorls. Thyrsus and cyathium are different inflorescence types (cyathium is characteristic of Euphorbia). Hypanthodium is found in Ficus.

Onion is a classic example of a bulb, which is a modified underground stem with fleshy leaves used for food storage. A rhizome grows horizontally (ginger), a corm is solid (gladiolus), and a tuber is an enlarged stem end (potato). The onion's concentric layers are actually fleshy leaves.

The condition where all the stamens may be fused forming a single bundle is called monadelphous.