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Write the modes by which insects affect the crop yield.


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Crops are affected by insects in three ways:

1. Insect pests cut the parts of the plants such as root, leaf and stem affecting the plants processes such as photosynthesis leading to a decreased production of food for plant and decreased growth.

2. Insect pests attack the cell sap of a plant at various parts and feed on the nutrients of the plant resulting in poor yield of the crop.

3. Insect pests bore into fruits and stems of a plant. This leads to a decreased yield of the crop.

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