Given below are some characteristics of photosynthetic plants. Which of these are true for `C_(4)` plants
(i) Rubisco is present in the mesophyll cells
(ii) 3-carbons in the primary `CO_(2)` acceptor
(iii) The primary `CO_(2)` fixation product is PGA
(iv) Possess PEP case.
(v) The intitial carboxylation reaction occurs in bundle sheath cells
(vi) The calvin cycle takes place in bundle sheath cells
(vii) 4-carbon atoms in the primary `CO_(2)` fixation product.

Options

A. (i), (iv), (v), (vii)
B. (i), (ii), (iii), (iv), (vii)
C. (ii), (iii), (iv), (vi), (vii)
D. (ii), (iv), (vi), (vii)

Answer

To determine which characteristics of C4 plants are true, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Rubisco is present in the mesophyll cells**:
- This statement is **false**. In C4 plants, Rubisco is primarily located in the bundle sheath cells, not in the mesophyll cells. The initial carbon fixation occurs in the mesophyll cells, but Rubisco is not found there.

2. **3-carbons in the primary CO2 acceptor**:
- This statement is **true**. The primary CO2 acceptor in C4 plants is phosphoenolpyruvate (PEP), which is a 3-carbon molecule.

3. **The primary CO2 fixation product is PGA**:
- This statement is **false**. The primary product of CO2 fixation in C4 plants is oxaloacetate (a 4-carbon compound), not phosphoglycerate (PGA), which is associated with C3 plants.

4. **Possess PEP carboxylase**:
- This statement is **true**. C4 plants possess the enzyme PEP carboxylase, which catalyzes the reaction of CO2 with PEP to form oxaloacetate.

5. **The initial carboxylation reaction occurs in bundle sheath cells**:
- This statement is **false**. The initial carboxylation reaction occurs in the mesophyll cells, where CO2 is fixed to PEP.

6. **The Calvin cycle takes place in bundle sheath cells**:
- This statement is **true**. The Calvin cycle, which uses the products of the initial CO2 fixation, occurs in the bundle sheath cells.

7. **4-carbon atoms in the primary CO2 fixation product**:
- This statement is **true**. The primary product of CO2 fixation in C4 plants is oxaloacetate, which contains 4 carbon atoms.

### Summary of True Statements:
- True statements for C4 plants:
- (ii) 3-carbons in the primary CO2 acceptor
- (iv) Possess PEP carboxylase
- (vi) The Calvin cycle takes place in bundle sheath cells
- (vii) 4-carbon atoms in the primary CO2 fixation product

Thus, the correct option is: **2, 4, 6, and 7**.

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