1.

What are weeds? Name any four harmful effects of weeds. Also write the names of four weeds.

Answer»

Weed: Any plant growing out of its proper place or where it is not wanted/ desired is called as a weed or weeds are the plants out of place in cultivated fields, lawns or orchards etc.

Harmful effects of weeds:

  • Weeds reduce the economic yield by competing with main crop for water, nutrition, light, space and air.
  • Weeds create difficulty while carrying out cultural practices in the field like hoeing, irrigation and harvesting.
  • Several weeds act as alternate hosts to many serious pests/ diseases. They may harvour insects-pests and act as secondary hosts for spread of several diseases.
  • Some weeds are injurious to animal and human health. 
  • For example, Parthenium and Datura seeds are poisonous in nature and may cause allergy to human beings.

Names of weeds:

Common nameBotanical nameCommon nameBotanical name
Wild senjiMelilotus parvifloraWild palakRumex dentatus
MainaMedicago denticulaiaAmarbelCuscuta sp.
BathuChenopodium albumKahiSaccharum spontaneum
ChulaiAmaranthus virdisBhangCannabis sativa
BhakhraTribulus terristrisKhabbal grassCynodon dactylon
PuthkandaAchyranthus asperaBaru grass·Sorghum halepense
Dib (Dab)Typha latijoiiaMothaCyperus rotundus
Bhoorni aonlaPhyllanthus niguriParthenium orParthenium hyterophorus
KanaSaccharum munjaLantanaLantana camara
DhatooraDatura stramoniumJangli gobhiLaunea nudicaulis
Jangli gajjarDaucus carota
Khat yayPortulaca sp.

weeds are the unwanted , undesirable  plants that grow along with main crop
due to growth of weedd:-
weeds compete with plants for minerals 
weeds compete with plant for space for their growth and development


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