Explanation

• Citrus trees in tropical regions are mostly evergreen.
• They retain and grow leaves throughout the year due to consistent warm climate.
• Seasonal changes have minimal effect on their leaf growth.

Additional information:

• Examples of citrus trees: Orange, Lemon, Lime, Grapefruit.
• Evergreen nature helps in continuous photosynthesis and fruit production.

Last verified on 20-01-2026

Explanation

• Nutritive foods supply the body with necessary nutrients for growth, energy, and repair.
• They include all food groups that contribute to balanced nutrition.

Additional information:

• Cereals provide carbohydrates for energy.
• Vegetables and fruits provide vitamins and minerals.
• Meat provides proteins and iron for body-building.

Last verified on 20-01-2026

Explanation

• Soybean plants have dense root systems that bind soil particles, reducing erosion.
• It is commonly used in crop rotation and soil conservation programs.

Additional information:

• Other soil-conserving crops include clover, alfalfa, and grasses.
• Planting cover crops also improves soil fertility and prevents weed growth.

Last verified on 20-01-2026

Explanation

• Updating involves periodically adding, modifying, or deleting records to maintain accuracy.
• It keeps files and databases current and useful for operations.

• Common in accounting software, student records, and inventory systems.
• Helps prevent data redundancy and errors.

Last verified on 20-01-2026

Explanation

Explanation

Explanation

First Urdu Poet According to Hafiz Mehmood Sherani

• Poet: Saad Salman (Mas'ud Sa'd Salman)
• Reference: Punjab Mein Urdu by Hafiz Mehmood Sherani
• Argument: Urdu developed in Punjab after Mahmud of Ghazni’s conquest
• Language Origin: Fusion of local dialects + Persian + Arabic
• Earlier Views: Muhammad Hussain Azad considered Wali Dakhni as first Urdu poet
• Sherani’s Conclusion: First Urdu poet was Mas'ud Sa'd Salman from Lahore

Last verified on 20-01-2026

Explanation

• Plants that do not shed their leaves seasonally are called evergreen plants.
• They maintain green foliage throughout the year.

Additional information:

• Examples of evergreen plants: Pine, Eucalyptus, Mango.
• Evergreen trees play an important role in preventing soil erosion and maintaining oxygen levels.

Last verified on 20-01-2026

Explanation

• Compounds with the same molecular formula but different arrangements of atoms are called isomers.
• Isomers can have different chemical and physical properties despite having the same number of atoms.

• Additional information:
  • Example of isomers: C₂H₆O → Ethanol (CH₃CH₂OH) and Dimethyl ether (CH₃OCH₃)
  • Isomerism is classified into structural isomers and stereoisomers.

Explanation

• Primary production includes extracting and producing natural resources, like crops, livestock, and minerals.
• Rural populations rely heavily on agriculture and related activities

Additional information:

• Examples of primary production: wheat farming, fruit orchards, fishing, cattle rearing.
• These activities support urban industries by providing raw materials.

Last verified on 20-01-2026