What is DDT?
Dichloro diphenyl trichloroethane
Dichloro diphenyl trichloromethane
Dichloro diphenyl dichloroethane
Dichloro diphenyl trichlorobutane
How are seeds of plants formed?
By fertilization
By germination
By dispersal
By pollination
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
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
Where do all the foods we eat come from?
Plants
Chemicals
Animals
Factories
Why do we use insecticides?
To kill fungi
To kill weed
To kill insects
To increase fertility of soil
Effectiveness of DDT was discovered by:
Rachel Carson
Paul Muller
Charles Townsend
Richard Abegg
Why are fertilizers added to soil?
To add the water content of the soil
To distribute the minerals in the soil
To replace the minerals that have been taken away in the crop
To kill pests and insects
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
Which of the following factors affects photosynthesis in plants?
Amount of light
Amount of oxygen
Amount of water vapor
Amount of weeds