Introduction: India is one of the largest agricultural producers in the world and is known for its diverse range of commercial crops. These crops play a significant role in the country's economy and contribute to its agricultural exports. However, not all crops are grown on a commercial scale in India.

Explanation:
Among the given options, Maize is not a commercial crop in India. Here's why:

1. Maize cultivation in India:
Maize is primarily grown as a subsistence crop in India rather than on a commercial scale. It is mostly cultivated by small-scale farmers for their own consumption or as animal feed. The production of maize in India is not extensive when compared to crops like rice, wheat, and pulses.

2. Factors affecting commercial cultivation:
Several factors contribute to the non-commercial cultivation of maize in India:

- Climate: Maize requires specific climatic conditions for optimal growth, including temperature, rainfall, and sunlight. These conditions may not be suitable in all regions of India, limiting its commercial cultivation.
- Market demand: The demand for maize as a staple food in India is relatively low compared to other crops like rice and wheat. The market demand plays a crucial role in determining the commercial viability of a crop.
- Agricultural practices: Maize cultivation requires specific agricultural practices, including the use of fertilizers, irrigation techniques, and pest control measures. The adoption of these practices may be limited among small-scale farmers due to various constraints.

3. Importance of other crops:
While maize may not be a commercial crop in India, other crops like sugarcane, cotton, and rubber play a significant role in the country's agricultural sector:

- Sugarcane: India is one of the largest producers of sugarcane in the world. The crop is extensively cultivated in states like Uttar Pradesh, Maharashtra, and Karnataka. Sugarcane is used for sugar production as well as for the production of molasses and ethanol.
- Cotton: India is one of the largest producers and exporters of cotton. It is grown in several states, including Gujarat, Maharashtra, and Andhra Pradesh. Cotton is used for textile production and contributes significantly to India's textile industry.
- Rubber: Rubber cultivation is mainly concentrated in the southern states of Kerala, Tamil Nadu, and Karnataka. India is among the largest producers of natural rubber globally. Rubber is used in various industries, including automobile, footwear, and pharmaceuticals.

Conclusion:
In conclusion, among the given options, Maize is not a commercial crop in India. Factors such as climate suitability, market demand, and agricultural practices contribute to its limited commercial cultivation. Other crops like sugarcane, cotton, and rubber are commercially significant in India and contribute to the country's agricultural exports.