cyperinus and parthenium are example of
a) diseases
b) pesticides
c) weeds
d) pathogens
Answers
Answer:
C. Is the right answer. Weeds
Explanation:
The unwanted plants that grow by their own in the cultivating fields and compete with required crops for food, light, space and essential nutrients present in the soil are weeds.
FOR EXAMPLE: Parthenium (gajar ghas), Cyperinus rotundus(motha).
As they compete with all necessary requirement for growth of a plant they end up affecting the growth of the required crop plants.
To ensure good harvest they must be removed from the field to be used for cultivation, befor sowing the required crops.
Weeds, insect and pests that affect the growth of crop plant can be comtrolled by using herbicides, insecticides and fungicide by spraying them on the crops.
Weeds can also be removed by cutting them down.
Some other methods to prevent growth of weed are:-
:- proper seed bed preparation.
:- timly sowing of crops.
:-inter cropping and cropratation.
:-use of resistant varieties.
:-summer ploughing in which fields are ploughed deep in sammer ti ensures removal of weeds and pests.....
Answer:
c) weeds
Explanation:
Scirpus cyperinus, commonly known as woolgrass, is a herbaceous emergent that is native to the eastern United States and eastern Canada. Other common names include cottongrass bulrush and brown woolly sedge. This sedge is very variable in appearance.
Parthenium is a genus of North American shrubs in the sunflower tribe within the daisy family. The name Parthenium is derived from either the Greek word parthenos, meaning "virgin," or parthenion, an ancient name for a plant. Parthenium or Gajar Ghans is the most common invasive species in India.