Protection from Pests MCQs Quiz | Class 9
Take this Class IX Science (Code 086) quiz from Unit IV: Food Production to test your knowledge on Protection from Pests. The questions cover key topics including methods of weed control, prevention of insect pests, examples of plant diseases, and storage grain protection. Click ‘Submit Quiz’ to view your score and download the comprehensive answer PDF.
Overview: Protection from Pests
In agriculture, crop protection management is essential to ensure high yields. Crops are vulnerable to weeds, insect pests, and diseases during growth, and to biotic and abiotic factors during storage. Understanding these threats and their control measures is a key part of Food Production in Class 9 Science.
1. Weeds
Weeds are unwanted plants in the cultivated field (e.g., Xanthium, Parthenium, Cyperinus rotundus). They compete with crop plants for food, space, and light, reducing the overall yield.
- Removal: Can be done mechanically (uprooting), chemically (using herbicides or weedicides), or biologically.
- Prevention: Proper seed bed preparation, timely sowing, and intercropping help suppress weed growth.
2. Insect Pests
Insects attack plants in three major ways:
- Cutting: They cut the root, stem, and leaf.
- Sucking: They suck the cell sap from various parts of the plant.
- Boring: They bore into stems and fruits.
3. Diseases
Plant diseases are caused by pathogens such as bacteria, fungi, and viruses. These pathogens can be transmitted through soil, water, and air.
| Type | Mode of Transmission | Example |
|---|---|---|
| Fungal | Air/Seed | Rust of Wheat |
| Fungal | Seed/Soil | Smut of Wheat |
| Viral | Vectors (Insects) | Leaf Curl |
4. Storage Grain Protection
Post-harvest losses are caused by biotic factors (insects, rodents, fungi, mites) and abiotic factors (inappropriate moisture and temperature). Control measures include strict cleaning of produce, proper drying (first in sunlight, then in shade), and fumigation using volatile chemicals to kill pests.
Quick Revision List
- Herbicides: Chemicals used to control weeds.
- Summer Ploughing: Deep ploughing in summer to kill pests and weeds.
- Fumigation: Using fumes to destroy pests in stored grains.
- Resistant Varieties: Using hybrid seeds that naturally resist diseases.
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