Explanation

• Butterflies, moths, and honeybees help in transferring pollen from one flower to another, aiding in plant reproduction.
• They are essential for pollination of crops and wild plants.

Additional information:

• Pollination increases fruit and seed production.
• Honeybees are also important for honey production.

Last verified on 19-01-2026

Explanation

• Pakistan’s forest area is decreasing over the years due to deforestation, urbanization, and overgrazing.
• Forests cover about 5% of Pakistan’s total land area.

Additional information:

• Major forests: Himalayan, Indus plain, and mangrove forests.
• Government programs like tree plantations and protected areas aim to slow down deforestation.

Explanation

• The services sector is the largest contributor to Pakistan’s GDP.
• It accounting for around 58% of the total GDP.
• Agriculture contributes about 23%.
• Industry/manufacturing contributes around 20%.
  

Additional information:

• Services include finance, transport, education, health, and IT.
• Growth in services reflects urbanization and modernization of the economy.

Last verified on 19-01-2026

Explanation

Major sucking pests of cotton include:

• Whitefly – Causes leaf curling and transmits cotton leaf curl virus.
• Jassid (Leafhopper) – Sucks sap from leaves, causing yellowing.
• Aphid – Sucks plant sap and spreads viral diseases.

Additional information:

• Sucking pests reduce plant vigor and yield.
• Control methods: insecticides, biological control, and resistant varieties.

Last verified on 19-01-2026

Explanation

• Cereal crops are grown primarily for their edible grains.
• Examples: Wheat, Barley, Rice, Corn (Maize).

Additional information:

• Cotton: Fiber crop, not a cereal.
• Sugarcane: Cash crop, grown for sugar production.
• Cereal crops are staple foods and form a major part of the human diet.

Last verified on 19-02-2026

Explanation

• Strip cropping involves planting different crops in alternate strips along the contour of the land.
• It helps in reducing soil erosion by slowing water runoff and protecting soil.

Additional information:

• Monocropping: Growing a single crop continuously – increases soil erosion risk.
• Shifting cultivation: Clearing new land each season – also leads to erosion.
• Example: Alternating strips of maize and legumes on slopes.

Last verified on 19-01-2026

Explanation

Explanation

• Intercropping is the practice of growing two or more crops simultaneously on the same field.
• It helps in better land use, pest control, and higher overall yield.

Additional information:

• Crop rotation: Growing different crops in the same field in different seasons.
• Mixed farming: Growing crops and raising livestock together.
• Example of intercropping: Maize with legumes.

Last verified on 19-01-2026

Explanation

• Using traps for insects is a mechanical method of pest control.
• It involves physically capturing or killing pests without chemicals.

Additional information:

• Chemical control: Use of pesticides.
• Biological control: Use of natural predators or parasites.
• Examples of traps: Sticky traps, pheromone traps, light traps.

Last verified on 19-01-2026

Explanation

• Carbon has a valency of 4, meaning it can form 4 covalent bonds with other atoms.
• This property allows carbon to form complex organic compounds.
• It is the backbone of all organic molecules.

Additional information:

Examples of Carbon Compounds (5):

1. Methane (CH₄)
2. Ethane (C₂H₆)
3. Glucose (C₆H₁₂O₆)
4. Ethanol (C₂H₅OH)
5. Carbon dioxide (CO₂)

Last verified on 19-01-2026