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Subjects
Science CBSE
Class 9
Improvement in food resources
Crop yield improvement
13.
Weeds, crop diseases, and insect pests
Exercise condition:
5
m.
Choose the correct answer
:
1
.
Xanthium is an example of a
insect pests
none of the above
weed
crop that is used in green manure
2
.
Crop diseases are caused due to
all of the above
insect pests
weeds
virus
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