The following are the major concerns about GM crops and GM foods, except:

Options

A. A. The GM crops may change the fundamental vegetable nature of plants as the genes from animals are being introduced into crop plants
B. B. The GM crops may lead to change in the evolutionaty pattern
C. C. The antibiotic resistance marker genes used to produce GM crops may move from plants to gut microflora of humans and animals and increase the problem of antibiotic resistance in pathogens
D. D. The introduction of GM crops has reduced to the crop yield

Answer

To answer the question regarding the major concerns about GM crops and GM foods, we need to analyze the options provided and identify which one is not a concern.

### Step-by-Step Solution:

1. **Identify the Options**:
- We need to look at the options provided (A, B, C, D) to determine which one does not represent a major concern about GM crops and foods.

2. **Analyze Each Option**:
- **Option A**: This option states that GM crops may increase the fundamental vegetable nature of plants due to the introduction of genes from animals. This is a concern because it implies that the natural characteristics of plants could be altered negatively.
- **Option B**: This option mentions that GM crops may lead to changes in the evolutionary pattern. This is a concern as it suggests that genetic modifications could disrupt natural selection processes.
- **Option C**: This option discusses the potential for antibiotic resistance marker genes to transfer to human and animal microflora, leading to increased antibiotic resistance. This is a significant concern in the context of public health.
- **Option D**: This option states that the introduction of GM crops has reduced crop yield. This is not a major concern because, in fact, GM crops are often developed to increase yield and improve nutritional quality.

3. **Determine the Correct Answer**:
- Based on the analysis, **Option D** is the correct answer as it does not represent a major concern about GM crops and GM foods. Instead, GM crops are generally associated with increased yields.

### Final Answer:
The following are the major concerns about GM crops and GM foods, except: **D) The introduction of GM crops has reduced the crop yield.**