Unit 4

• IMD Classification of Tropical Cyclones:
• Low Pressure: Wind speed $\lt 17\text{ knots}$
• Depression: $17 - 27\text{ knots}$
• Deep Depression: $28 - 33\text{ knots}$
• Cyclonic Storm: 34 to 47 knots ($62 - 88\text{ km/h}$)
• Severe Cyclonic Storm: $48 - 63\text{ knots}$
• Very Severe Cyclonic Storm: $64 - 89\text{ knots}$. (Correct answer: Option 2)

• Completely Randomized Design (CRD): The simplest experimental design where treatments are assigned entirely at random to homogeneous experimental units without blocking.
• Suitability for Laboratories: Ideal for laboratory, growth chamber, and greenhouse experiments where environmental factors (light, temperature, humidity) are strictly uniform and homogenous across all units.

Correct option: (2) CRD (Completely Randomized Design)