Mention three different ways in which crop plants can be attacked by insect pests. Also suggest one control measure and two preventive measures against pests.
CBSE Class IX Science SA 2 (3 Marks)
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biocontrol agent are the best against pest
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Three ways in which crop plants can be attacked by insect pests :
(i) They cut the plant parts.
(ii) They suck the cell sap from various parts.
(iii) They bore into stem and fruits.
Control measure : Spraying pesticides
Preventive measure : (i) Use of resistant varieties, (ii) Ploughing
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