Explanation

• Herbicides are chemicals used to kill or control weeds in crops and gardens.
• They target unwanted plants without affecting the main crop.
• Fertilizers provide nutrients; pesticides control insects and pests.
• Herbicides improve crop yield by reducing competition for resources.

Last verified on 04-02-2026

Explanation

• Enzyme activity depends on several factors: temperature, pH, and substrate concentration.

Additional information:

• Temperature: Too high or too low can denature enzymes.
• pH: Each enzyme has an optimal pH for maximum activity.
• Substrate concentration: Higher concentration increases rate until saturation.

Last verified on 04-02-2026

Explanation

Explanation

• Short-term markets are designed for perishable agricultural commodities.
• These include products that spoil quickly if not sold.
• Helps farmers sell quickly and reduces losses.
• Examples: fruits, vegetables, milk, fish.

Last verified on 04-02-2026

Explanation

• Water in soil exists in three forms: capillary, gravitational, hygroscopic.
• Capillary water is held in small soil pores and is available for plant roots.
• Capillary water is crucial for plant growth and nutrient transport.

Last verified on 04-02-2026

Explanation

• Diseases can be spread through air, water, and soil.
• Airborne pathogens include viruses and bacteria in droplets.
• Waterborne diseases spread via contaminated drinking or irrigation water.
• Soil-borne pathogens affect plants and sometimes humans.

Last verified on 04-02-2026

Explanation

• Viticulture specifically refers to grape cultivation.
• Uses of grapes: Fresh fruit, juice, wine, raisins

Additional information:

• Pomology → study and cultivation of fruits in general
• Olericulture → cultivation of vegetables

Last verified on 25-01-2026

Explanation

• Nocturnal insects are active at night.
• Examples include moths, crickets, and many beetles.

Additional information:

• Diurnal insects: Active during the day (e.g., butterflies, bees)
• Crepuscular insects: Active at dawn and dusk (e.g., mosquitoes, some moths)

Last verified on 25-01-2026

Explanation

• Citrus canker affects citrus plants like oranges and lemons.
• Caused by the bacterium Xanthomonas citri.
• Leads to lesions on leaves, stems, and fruits.
• Reduces fruit quality and yield significantly.
• Spread by wind, rain, and contaminated tools.

Last verified on 04-02-2026

Explanation

• Before 1940, most pesticides were natural origin.
• They were mainly derived from plants and minerals.
• Examples include sulfur and arsenic compounds.
• Synthetic organic pesticides became common after 1940.
• Early pest control relied on natural substances.

Last verified on 04-02-2026