Identify the incorrect one

Options

A. In all plants light phase takes in similar way
B. During dark phase `CO_2` assimilation takes place in two ways
C. In all plants PGA is first stable product
D. Dark phase is indirectly dependent on light

Answer

To identify the incorrect statement regarding photosynthesis in higher plants, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Analyze Option 1: "In all plants, light phase takes place in a similar way."**
- The light phase of photosynthesis, which includes the light-dependent reactions, generally occurs in the chloroplasts of plants. While the basic mechanism is similar, variations exist among different types of plants (e.g., C3, C4, and CAM plants). However, the statement is somewhat true as the fundamental processes are similar across most plants.

2. **Analyze Option 2: "During dark phase, CO2 assimilation takes place in two ways."**
- The dark phase, also known as the Calvin cycle, primarily involves CO2 fixation. While it can be true that there are different pathways for CO2 assimilation (like C3 and C4 pathways), the statement is vague. However, it is generally accepted that CO2 assimilation occurs in various ways in different plants, making this statement likely true.

3. **Analyze Option 3: "In all plants, PGA is the first stable product."**
- PGA (phosphoglyceric acid) is indeed the first stable product formed in the Calvin cycle of C3 plants. However, in C4 plants (like sugarcane and millets), the first stable product is oxaloacetic acid (OAA). Therefore, this statement is incorrect as it does not hold true for all plants.

4. **Analyze Option 4: "Dark phase is indirectly dependent on light."**
- The dark phase does not require light directly; however, it relies on the ATP and NADPH produced during the light phase. Thus, it can be said that the dark phase is indirectly dependent on light, making this statement true.

### Conclusion:
After analyzing all the options, we find that **Option 3** is the incorrect statement because it claims that PGA is the first stable product in all plants, which is not true for C4 plants.

### Final Answer:
The incorrect statement is **Option 3: "In all plants, PGA is the first stable product."**

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