What are the basic objectives behind the crop variety improvement?

Options

A. To increase the yield of plant products.
B. To produce biotic and abiotic resistance to the plants
C. To improve the quality of food crops.
D. All of these

Explanation

### Step-by-Step Solution:

1. **Understanding Crop Variety Improvement**:
- Crop variety improvement refers to the process of enhancing the genetic characteristics of crops to achieve better performance in agriculture.

2. **Objective 1: Increasing Yield**:
- One of the primary objectives is to increase the yield of plant products. Higher yields mean more produce can be harvested, which directly contributes to food security and increases the market value of the crops.

3. **Objective 2: Biotic and Abiotic Resistance**:
- Another key objective is to develop crops that are resistant to biotic (pests, diseases) and abiotic (drought, salinity) stresses. This resistance helps in reducing the reliance on chemical pesticides and insecticides, making farming more sustainable and environmentally friendly.

4. **Objective 3: Improving Quality**:
- Improving the quality of food crops is also a significant objective. Higher quality crops not only enhance nutritional value but also increase consumer demand and market prices.

5. **Conclusion**:
- In summary, the basic objectives behind crop variety improvement are to increase yield, enhance resistance to biotic and abiotic factors, and improve the quality of food crops. All these objectives work together to promote agricultural growth and sustainability.