In which way can weeds negatively affect crop plants?
Crop plants get less resources
Crop plants grow less
Crop plants get killed
Crop plants grow very close to each other.
What are legumes?
Substance that kills fungi
Substance used to kill insects and pests
Substance used to remove weeds
The main crops that produce seeds for food
How can the rate of photosynthesis be increased?
By planting more weeds
By regulating the amount of light, temperature and carbon dioxide
By adding more fertilizers
By planting more trees
Effectiveness of DDT was discovered by:
Rachel Carson
Paul Muller
Charles Townsend
Richard Abegg
Which of the following factors affects photosynthesis in plants?
Amount of light
Amount of oxygen
Amount of water vapor
Amount of weeds
What is DDT?
Dichloro diphenyl trichloroethane
Dichloro diphenyl trichloromethane
Dichloro diphenyl dichloroethane
Dichloro diphenyl trichlorobutane
Why do we use insecticides?
To kill fungi
To kill weed
To kill insects
To increase fertility of soil
What type of fertilizers can give crops instant supply of minerals ?
Organic fertilizers
Inorganic fertilizers
Manure
Compost
Where do all the foods we eat come from?
Plants
Chemicals
Animals
Factories
Who introduced organic farming?
