Landscaping

Indoor plants are commonly used in shopping centres, hotels, and resorts to create a relaxed and pleasant atmosphere. The presence of greenery helps reduce stress, improves air quality, and enhances the aesthetic appeal of indoor spaces.
Filtering sounds (B) can be a minor benefit but is not the primary reason for indoor plants here.
Reducing glare (C) is usually achieved through blinds or curtains, not plants.
Line calligraphy (D) is unrelated to the function of indoor plants. Therefore, indoor plants mainly contribute to creating a calming environment.

Overwatering or underwatering is the main cause of injury or death in many indoor plants. Improper watering leads to root rot or dehydration, both of which severely affect plant health.
Ventilation (A) affects air circulation but is rarely the direct cause of death.
Humidity (C) affects moisture levels but is less critical than watering.
Temperature (D) influences plant growth but is not the main cause of injury or death. Proper watering practices are essential to maintain healthy indoor plants.

Arches are arbour-like structures created over walkways or garden paths to support climbing plants (climbers and ramblers). They not only provide structural support but also enhance the aesthetic appeal of the landscape.
Pergolas are similar structures but usually larger and more open, often forming shaded walkways or sitting areas.
Hedges are dense rows of shrubs or small trees used as boundaries.
Shrubbery refers to an area planted with shrubs. Thus, the correct term for arbour-like structures over walkways supporting climbers is arches.

Intangible enrichment items refer to elements that enhance the environment but cannot be physically touched or seen directly.
Fragrance is an intangible quality that adds to the sensory experience of a garden or landscape.
Specimen plants, birds, and water are tangible elements that can be seen or touched. Hence, fragrance is classified as an intangible enrichment item.

The concept of balanced planting about an imaginary line through the entrance relates to landscaping design principles that focus on enhancing the aesthetics and functionality of the public area of a house.
The public area refers to the part of the house that is visible and accessible to visitors, such as the entrance and front yard.
Balanced planting ensures symmetry and harmony in the arrangement of trees and shrubs, creating an inviting and well-structured look.
The private area is usually the inner or secluded part of the house, less focused on such symmetrical landscaping.
Service and storage areas are functional zones with minimal landscaping considerations. Thus, balanced planting about an imaginary central line is a design guideline primarily for the public-facing area.

A hedge is a row of shrubs or dwarf trees planted closely at regular intervals, which forms a living fence or boundary. Hedges are commonly used for privacy, decoration, and protection against wind or animals.
(A) Edge – Incorrect. Edges are borders around flower beds or lawns but not necessarily a fence.
(B) Arch – Incorrect. Arches are curved structures often used as garden entrances or supports.
(C) Topiary – Incorrect. Topiary involves trimming plants into ornamental shapes.
(D) Hedge – Correct. Row planting forming a fence or boundary.