Explanation

• Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes.
  • Occurs during prophase I of meiosis.
  • Increases genetic variation in gametes.
  • Ensures diverse traits in offspring.
  • Essential for evolution and natural selection.

Last verified on 06-02-2026

Explanation

• Population genetics studies the distribution of genes in populations over time.
• Based on Hardy-Weinberg law, which predicts allele and genotype frequencies under ideal conditions.
• Explains how mutation, selection, migration, and genetic drift affect populations.
• Helps in understanding evolution and breeding programs.

Last verified on 06-02-2026

Explanation

• Colostrum is the first milk produced by the mammary glands immediately after birth.
• Rich in antibodies, proteins, and nutrients.
• Helps boost immunity in newborns.
• Usually secreted for the first 2–3 days after parturition.
• Known as “liquid gold” due to its high nutritional value.

Last verified on 06-02-2026

Explanation

• Triticum aestivum is the scientific name of common wheat.
• It is a major staple crop grown worldwide.
• Used for flour, bread, and other food products.
• Cultivated in Rabi season in countries like Pakistan.
• Belongs to the Poaceae (grass) family.

Last verified on 06-02-2026

Explanation

• A hermaphrodite has both male and female reproductive organs.
• Can produce both eggs and sperm.
• Common in some plants, invertebrates, and fish.
• In humans, it is rare and medically referred to as intersex.
• Helps in reproduction when mates are scarce in some species.

Last verified on 06-02-2026

Explanation

• Deciduous plants shed their leaves during winter or dry seasons.
• Helps reduce water loss and survive harsh conditions.
• Common in temperate regions.
• Leaves usually regrow in spring.
• Important for timber, fruits, and ecological balance.

Last verified on 06-02-2026

Explanation

• Emasculation is the artificial removal of stamens from a flower before they release pollen.
• Done to prevent self-pollination in plants.
• Common in hybrid seed production.
• Ensures cross-pollination from selected pollen donor.
• Important technique in plant breeding.

Last verified on 06-02-2026

Explanation

• An antidote is a substance that counteracts the effect of a poison.
• Works by neutralizing or blocking the toxic effect.
• Can be chemical, biological, or pharmaceutical.
• Commonly used in snake bites, chemical poisoning, and drug overdoses.
• Essential for emergency medical treatment.

Last verified on 06-02-2026

Explanation

• Humidity is the amount of water vapor present in the air.
  • It affects weather, climate, and comfort levels.
  • High humidity can make the air feel hotter, low humidity feels drier.
  • Measured using a hygrometer.
  • Important in agriculture, meteorology, and human health.

Last verified on 05-02-2026

Explanation

• Olericulture is the science and practice of growing vegetables.
• It involves planting, cultivation, harvesting, and storage of vegetables.

Additional information:

• Pomology – fruit cultivation
• Floriculture – flower cultivation
• Arboriculture – tree cultivation
• Viticulture – grape cultivation

Last verified on 06-02-2026