Landscape Gardening Questions and Answers

Answer: C

CAD stands for Computer Aided Design, the use of computers to create and draft designs, here landscape garden plans. It lets a designer draw, change and print plans on screen.

‘Computer And Design’, ‘Computer And Display’ and ‘Computer Art and Design’ are not what the standard abbreviation CAD stands for.

CAD software lets the designer draw plans, change them, view them in three dimensions and print them, and it replaces manual drafting. In landscape work it is used to draw the layout of beds, paths and planting plans.

Answer: C

The most serious weed in lawns is Cyperus rotundus, nutgrass or purple nutsedge, which spreads by tubers and rhizomes, tolerates mowing and is very hard to eradicate.

Agrostis tenuis (bent grass), Axonopus affinis (carpet grass) and Paspalum vaginatum (seashore paspalum) are themselves lawn grasses, not weeds.

Nutgrass spreads by underground tubers and survives mowing and many herbicides, which is why it is called the most serious lawn weed. Its leaves grow faster than those of lawn grasses, so it stands out as coarse yellowish-green tufts in a lawn.

Answer: B

Growth of moss indicates acid conditions in a lawn. Moss spreads on acidic, poorly drained, shaded soil where grass is weak, so its presence is a sign that the soil needs liming.

Patch burning of grass points to fungal disease or dry spots, ants point to dry soil or nests, and weeds can grow in any soil, so none is a specific sign of acidity.

Mosses grow best on moist, acid and shaded ground where the turf grass is thin. When moss appears the usual remedy is lime and better drainage, and this is why moss is read as a sign of acidity.

Answer: B

In factory landscaping, the aim is to improve beauty and reduce pollution. Trees, shrubs and lawns trap dust, absorb some gases and cut noise, so a green belt reduces the pollution a factory produces.

Garbage, stress and maintenance are not what a green belt mainly reduces: landscaping adds maintenance rather than reducing it.

A green belt around a factory traps dust, absorbs some pollutant gases and reduces noise, so it lowers the pollution. It also makes the site look better, so the aims named in the question are met together.

Answer: B

A polygon is a closed area of the image bounded by straight or curved lines and filled with one solid colour. It is the basic filled shape in computer graphics.

A frame buffer is the memory that stores the image, a line is a single stroke, and a point is a single position, none of which is a filled closed area.

In computer graphics a polygon is a closed shape bounded by lines and can be filled with a single colour. Graphics systems store the picture in the frame buffer, and draw points, lines and polygons into it.

Answer: A

The limitation of CAD is that a design cannot be formed without knowledge. The software only draws what the designer specifies, so landscape knowledge is still required.

Easy correction of drawing errors, reuse of designs and safe storage are advantages of CAD, so options B, C and D are not limitations.

CAD does not replace the knowledge of the designer: someone must know plants, soil, drainage and design before drawing. Faster correction, reuse and safe storage of designs are advantages of the software.

Answer: A

The key gives economic consideration and utility. In countryside landscaping, plantings are meant to be useful as well as pleasant, using fruit, timber and fodder species. I could not find a source that settles the point, so this rests on the official key.

Aesthetic beauty is the main aim in urban gardens, and coolness and soil erosion control are secondary benefits.

In the countryside space is not limited and the land is used for production, so the planting plan stresses economic use and utility, using trees for fruit, fodder and timber. Decorative effect, shade and soil protection come second in the key's view.

Answer: D

Casuarina equisetifolia is not suitable for topiary: it is a tall tree with a loose, drooping habit that cannot be clipped into a dense shape. Duranta plumieri, Murraya exotica and Clerodendrum inerme are dense, small-leaved shrubs that take regular clipping.

That is why the question's NOT option is Casuarina.

Topiary is the clipping of plants into shapes and needs dense, small-leaved, slow-growing and tolerant species. Casuarina is an open, fast-growing tree with fine drooping branchlets, which clip poorly.

Answer: D

A garden cannot be created in the manufacturing unit, because the production area has machinery, hazards and traffic with no room for plants. The administrative building, canteen and rest shed are areas where people gather and can have plantings around them.

That is why the manufacturing unit is the place where a garden cannot be made.

Gardens in factories are made around offices, canteens and rest sheds and along boundaries, as green belts, but not inside a manufacturing unit where the process is carried out.

Answer: D

Sprinkler irrigation is the best method for lawns, because it gives a uniform light spray over the whole grass cover and can be timed.

Flooding wastes water and causes uneven wetting, drip does not cover a continuous turf, and a funnel system is not a lawn irrigation method.

Lawns need uniform, light and frequent watering over the whole area, and a sprinkler gives this without flooding. Flood irrigation gives uneven wetting and damages the surface.