Definitions of meteorological isolines:

• Isohels are lines connecting places of equal sunshine duration (II).
• Isonephs are lines connecting places with equal average cloud cover (IV).
• Isotachs are lines connecting places of equal wind velocity (I).
• Isotherms are lines connecting places of equal temperature (III).
  Matching: (A)-(II), (B)-(IV), (C)-(I), (D)-(III).

Analysis of soil thermal and chemical properties:

• Statement (1) is incorrect: Sandy soils heat up faster than clay soils because sandy soils have lower moisture retention and lower heat capacity, whereas clay soils have a higher heat capacity (water has a specific heat of $1.0\text{ cal/g}$, much higher than dry soil minerals).
• Statement (2) is incorrect: Gypsum requirement is directly proportional to Cation Exchange Capacity (CEC) and exchangeable sodium percentage (ESP). Clay soils have much higher CEC than sandy soils, meaning clay soils have a substantially higher gypsum requirement than sandy soils.
• Therefore, both statements are incorrect.