Question

Xanthium, Parthenium, Cyperus rotundus are the examples of
A.Diseases
B.Pesticides
C.Weeds
D.Pathogens

Answer 1

Hint: The undesirable plants which develop alongside the yield plants in the developed field. Some basic weeds in India are Amaranthus (Chaulai), Parthenium (Gajar ghas), Cyperus rotundus (Motha), Chenopodium (Bathua), Xanthium (Gokhroo). Weeds contend with the yield plants for supplements, space, light and water. This results in bringing down the food grain quality and decrease in crop yield. They may create poisonous substances which may meddle with crop development. During gathering, weeds get stirred up with yields to let down its quality.

Complete answer:
A weed is a plant thought about unfortunate in a specific circumstance, "a plant in some unacceptable spot". Models usually are plants undesirable in human-controlled settings, for example, ranch fields, nurseries, yards, and parks. Systematically, the expression "weed" has no plant noteworthiness, in light of the fact that a plant that is a weed in one setting isn't a weed when filling in a circumstance where it is indeed needed, and where one types of plant is a significant yield plant, another species in similar family may be a genuine weed, for example, a wild thistle developing among developed loganberries. Similarly, volunteer harvests (plants) are viewed as weeds in a resulting crop. Numerous plants that individuals generally view as weeds additionally are deliberately filled in gardens and other developed settings, in which case they are in some cases called valuable weeds

The regular cocklebur (Xanthium strumarium) is a local of North America. It has become an invasive species around the world. It attacks rural terrains and can be toxic to domesticated animals, including ponies, steers, and sheep. Some homegrown creatures will abstain from devouring the plant if other search is available, yet less segregating creatures, for example, pigs, will burn-through the plants and afterward nauseate and kick the bucket. The seedlings and seeds are the most harmful pieces of the plants. Indications normally happen inside a couple of hours, creating precariousness and shortcoming, sorrow, queasiness and retching, contorting of the neck muscles, quick and powerless heartbeat, trouble breathing, and inevitably demise. Youthful plants at first structure white, beefy rhizomes, up to 25 mm (1.0 in) in measurement, in chains. A few rhizomes fill upward in the dirt, at that point structure a bulb-like structure from which new shoots and roots develop, and from the new roots, new rhizomes develop.

So, the correct answer is “ option C”.

Note:
Parthenium or Gajar Ghans is the most widely recognized invasive species in India. Parthenium hysterophorus plant causes milk illness in animals and furthermore answerable for respiratory breakdown in people.As in other Cyperaceae, the leaves sprout in positions of three from the base of the plant, around 5–20 cm (2–8 in) long. The bloom stems have a three-sided cross-area. The bloom is androgynous and has three endurance and a three-shame pistil, with the inflorescence having three to eight inconsistent spikes. The organic product is a three-calculated achene.