Class IX

Which of the following is not a type of biotic stress?
  1. Diseases
  2. Insect
  3. Frost
  4. Nematodes
Which is the oldest breeding method?
  1. Introduction
  2. Hybridzation
  3. Mutation
  4. Selection
Science of vegetable is called ?
  1. Horticulture
  2. Apiculture
  3. Agriculture
  4. Floriculture
Sesame, castor and sunflower are rich in
  1. Proteins
  2. Carbohydrates
  3. Fats 
  4. All of these
Unwanted plants in crop field are called
  1. Seeds
  2. Stem
  3. Weeds
  4. None of these
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