Question

Which of the following is also called unwanted plants?
A)Weeds
B)Shrubs
C)Grasses
D)Weeds

Answer 1

Hint: 1)Unwanted plants are those plants that are undesirable in a particular circumstance, basically those plants that have grown in the wrong place.
2)Such plants have no botanical significance and even said that it has no economic significance as well.
3)They get advantage over desirable plants or crops that they can grow more easily and quickly.

Complete answer:
Weeds- Plants that are harmful to human health are known as weeds. Such plants are invasive and widely inhabit the areas in which they emerge. Owing to the competition they provide for commercially valuable crops or trees, the weeds are considered undesirable.

These weeds compete with the plants by interfering with their food requirements. Weeds compete with the desired plants for their resources, they take up the minerals and nutrients that those plants need from the soil.

Shrubs- Shrub, any woody plant that is less than 3 m (10 feet) tall and has many stems, none dominant. It can be called a bush as much-branched and thick. Arborescence, or treelike shrubs, from 3 to 6 m tall are intermediate between shrubs and trees.

Grasses- Poaceae or Gramineae are known as grasses, a large and almost widespread family of monocotyledonous flowering plants. Which comprises the natural grassland with cereal grasses, bamboos and grasses, and plants planted in lawns and pasture. The above are usually regarded collectively as pasture.

Hence, the correct answer is option (D)

Note: 1)Weeds also provide food and shelter to various seed- eating birds and harm the plants that are useful to humans.
2)The roots of such plants that are grown extensively can damage the roots of the plants in their close proximity.