NEET Practice Questions (MCQs) with Answers & Solutions

In botany, a perianth is the non-reproductive part of the flower and consists of the calyx (sepals) and corolla (petals). When the calyx and corolla are not distinguishable from each other, they are collectively referred to as the perianth.

Polyadelphous condition is where stamens have free anthers but their filaments are fused into several groups. This is a characteristic feature observed in some plants.

The pappus is a modified calyx found in the Asteraceae family. It often appears as a tuft of bristles or scales that aids in the dispersal of seeds by wind.

In legumes, placentation is marginal. This means that the ovules are attached to the margins of the ovary. Legumes, such as peas and beans, typically have a single carpel, and the ovules are arranged along the margin. This is a characteristic feature of the Fabaceae family, which includes legumes.

In the given plants, the leaves are modified in the following ways: Sweet pea has tendrils which help in climbing. Bignonia has hooks which help in clinging and climbing. Nepenthes has pitcher-shaped leaves which trap insects. Utricularia has bladder-like structures to capture small aquatic organisms. Therefore, the correct sequence is sweet pea, bignonia, Nepenthes, and Utricularia.

Nepenthes (pitcher plant) and bladderwort (Utricularia) are both insectivorous plants. Nepenthes traps insects in its pitcher-like structure, while bladderwort captures small aquatic organisms using bladder-like traps. Both plants have evolved these adaptations to capture and digest prey to supplement their nutrient intake, especially in nutrient-poor environments.

A phyllode is a modified leaf. In some plants, the petiole or leaf stalk becomes flattened and performs the functions of a leaf, which is known as a phyllode. This adaptation is often seen in plants like Acacia.

A bulb is an underground specialized shoot with a reduced disc-like stem covered by fleshy leaves. Examples include onions and tulips. The fleshy leaves store nutrients for the plant.

Stipular tendril modification is found in Smilax. In this modification, the stipules, which are small leaf-like structures found at the base of the leaf stalk, transform into tendrils that help the plant to climb.

Viscum, commonly known as mistletoe, is a partial stem parasite. It attaches to the host tree, penetrates its tissues, and extracts water and nutrients. However, it also performs photosynthesis, hence it is not a total parasite.