How are seeds of plants formed?
By fertilization
By germination
By dispersal
By pollination
Effectiveness of DDT was discovered by:
Rachel Carson
Paul Muller
Charles Townsend
Richard Abegg
The amount of carbon dioxide in the air in a glass house can be increased by:
By pumping in extra carbon dioxide
By having blinds
By having ventilators
By adding more fertilizers to the soil
BSE stands for:
Bombay Stock Exchange
Bovine Spongiform Encephalopathy
Butane Spongiform Encephalopathy
Bovine spondylitis Encephalopathy
In which way can weeds negatively affect crop plants?
Crop plants get less resources
Crop plants get killed
Crop plants grow very close to each other.
Crop plants grow less
Weeds are removed by:
fungicides
Insecticides
Fertilizers
Herbicides
What type of fertilizers can give crops instant supply of minerals ?
Organic fertilizers
Inorganic fertilizers
Manure
Compost
Who was Rachel Carson?
Chemist
Teacher
Ecologist
Doctor
How can 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
How is fungi killed ?
By insecticides
By fertilizers
By pesticides
By fungicides
