Advertisements
Advertisements
प्रश्न
Mention three different ways in which insect pests can attack the crop plant.
Advertisements
उत्तर
Following are the three ways in which an insect pest can attack the crop plants:
1. Chewing insects: They destroy all kinds of crop plants by cutting root, stem, and leaf of plants with their chewing mouth parts. Examples: Locusts, grasshoppers, etc.
2. Sucking insects: They destroy the crop plant by sucking the cell sap from its various parts. Examples: Aphids, leaf hoppers, etc.
3. Internal feeders: They live inside the parts of plants. These are called borers (if they live in twigs or roots) or weevils (if they live in fruits and seeds). Examples: Pod borers and grain weevil.
APPEARS IN
संबंधित प्रश्न
What are the advantages of inter-cropping?
Give two limitations of using manure.
During the downpour in a village, the rain water carried away excess of nitrogenous and other compounds present in the soil to a pond. How will they affect the growth of algae and phytoplankton in the pond ?
Define manure. What are different manures and how do they affect the soil ?
Give a short account of biofertilizers.
Explain why a legume crop does not require nitrogenous fertilizers ?
Why water should be used judiciously ?
Explain various steps in hybridization of crop plants.
Describe the biological method of weed control.
Explain the various preventive measures against insect pests.
