The question asks to identify the incorrect statement among the given options related to plant families.

Liliaceae Plant Characteristics

The statement says, "In Liliaceae, some plants have underground parts." The family Liliaceae includes plants like onions, garlic, lilies, and tulips. Many members of this family store food in underground structures such as bulbs or rhizomes. For example, onions and garlic grow from bulbs, while some lilies grow from rhizomes. Therefore, this statement is correct.

• Examples of Liliaceae with underground parts: Onion (bulb), Garlic (bulb), Tulip (bulb), Lily (bulb or rhizome).

Thus, the statement "In Liliaceae, some plants have underground parts" is accurate.

Fibre-Yielding Plants in Malvaceae

The statement says, "Fibre-yielding plants are found in Malvaceae." The Malvaceae family includes plants such as cotton, okra, hibiscus, and cocoa. Cotton (genus Gossypium) is a well-known fibre-yielding plant, cultivated extensively for its seed hairs which are used to produce cotton fibre. Other plants in the family, like jute (from genus Corchorus, sometimes placed in Malvaceae or Tiliaceae), also yield fibres. Therefore, this statement is correct.

• Example of a fibre-yielding plant in Malvaceae: Cotton (Gossypium species).

Thus, the statement "Fibre-yielding plants are found in Malvaceae" is accurate.

Compositae (Asteraceae) Features

The statement says, "Trees with large flowers and seeds are found in Compositae." The family Compositae, also known as Asteraceae, is one of the largest families of flowering plants. It includes daisies, sunflowers, asters, marigolds, and lettuce. Most plants in this family are herbaceous, although some shrubs or small trees exist (e.g., some species of Scalesia or Espeletia). However, the characteristic feature of this family is the inflorescence, which is a capitulum or flower head, appearing like a single large flower but actually composed of many small florets (ray florets and disc florets). Individual florets and the subsequent seeds (achenes, often topped with a pappus) are typically small. While the entire flower head (like a sunflower) can be large, it's not a single large flower in the botanical sense. Large trees are not typical, and the seeds are generally small achenes. Therefore, this statement is incorrect.

• Typical habit: Mostly herbaceous plants, some shrubs, few trees.
• Flowers: Arranged in capitula (flower heads), not typically large individual flowers.
• Seeds: Small achenes.

Thus, the statement "Trees with large flowers and seeds are found in Compositae" does not accurately describe the typical characteristics of the Compositae (Asteraceae) family, making it the incorrect statement.

Based on the analysis, the incorrect statement is that trees with large flowers and seeds are found in Compositae.