Cropping indices definitions:

• Cropping effect is a general term for crop residue and rotation impacts on soil.
• Cropping Index is defined as the number of crops grown per annum on a given area of land multiplied by 100.
• Cropping Intensity is calculated as: $(\text{Gross Cropped Area} / \text{Net Sown Area}) \times 100$.
• Cropping Pattern refers to the yearly sequence and spatial arrangement of crops and fallow on a given area.

Definitions of specialized cropping systems:

• Parallel cropping involves growing two crops with zero competition due to differing growth habits and peak nutrient demands.
• Quadruple cropping refers to growing four successive crops in a single year.
• Sequential cropping involves growing two or more crops in sequence on the same field in a farming year.
• Multi-storeyed (or multi-tier) cropping is the practice of growing crops of different heights simultaneously on the same piece of land to efficiently exploit vertical canopy space, solar radiation, and root zones (e.g., coconut + black pepper + cocoa + pineapple).
  
  Option breakdown:
• Parallel cropping has crops of similar heights or zero competition.
• Quadruple cropping is based on season count.
• Sequential cropping is temporal sequence, not simultaneous layers.
• Multi storeyed cropping precisely utilizes vertical spatial layers simultaneously.