Explanation

Cotton cultivation requires a significant number of frost-free days, typically around 210

It is the crop that requires high temperatures (21°C to 30°C)

It thrives in tropical and subtropical climates

It's grown in the Kharif season

Explanation

• Sunlight is a good source of vitamin D.
• When our skin is exposed to sunlight, it produces vitamin D, 
• It is essential for bone health, immune function, and the regulation of calcium levels in the blood.
• Deficiency of Vitamin D results in Rickets.

Explanation

• Sound waves are mechanical waves and need a medium to travel.
  • They travel fastest in solids, slower in liquids, and slowest in gases.
  • Solid particles are closely packed, allowing rapid vibration transfer.

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

Explanation

• Refrigerants are gases used in refrigerators to absorb heat and provide cooling.
• Freon (CFCs) and ammonia are commonly used in domestic and commercial refrigeration.
• They evaporate at low temperatures, absorbing heat from the fridge interior.
  

Last verified on 03-02-2026

Explanation

The kidney is the primary organ responsible for filtering blood in the human body.

Each kidney contains approximately one million microscopic units called nephrons

They actively remove metabolic wastes (such as urea and creatinine)

Explanation

Chromosomes are made up of:

• Nucleic acid (DNA or RNA)
• Proteins (histones and non-histone proteins)

A chromosome is made up of proteins and DNA organized into genes.

Each cell normally contains 23 pairs of chromosomes.

Explanation

Explanation

• Citrus fruits are rich in Vitamin C, which is essential for immunity.
• Vitamin C also helps in wound healing, collagen formation, and iron absorption.
• Citrus fruits include oranges, lemons, limes, and grapefruits.

Last verified on 25-01-2026