Consider the following four statements (I - iv) and select the correct option stating which ones are true (T) and which ones are false (F).
(i) Formation of oxyhaemoglobin occurs on alveolar surface.
(ii) During gaseous exchange the gases diffuse from high partial pressure to low partial pressure.
(iii) Carbon dioxide cannot be transported with haemoglobin.
(iv) Earthworm respires through parapodia.

Options

A. `{:("(i)",(ii),(iii),(iv)),(T,F,T,F):}`
B. `{:("(i)",(ii),(iii),(iv)),(F,F,T,F):}`
C. `{:("(i)",(ii),(iii),(iv)),(F,T,F,T):}`
D. `{:("(i)",(ii),(iii),(iv)),(T,T,F,F):}`

Explanation

To determine which statements are true (T) and which are false (F), let's analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement (i): Formation of oxyhaemoglobin occurs on alveolar surface.**
- Oxyhaemoglobin is formed when oxygen binds to hemoglobin in red blood cells. This process occurs in the alveoli of the lungs where oxygen from the air diffuses into the blood.
- **Conclusion:** This statement is **True (T)**.

### Step 2: Analyze Statement (ii)
**Statement (ii): During gaseous exchange, the gases diffuse from high partial pressure to low partial pressure.**
- Gaseous exchange in the lungs occurs due to the difference in partial pressures of gases. Oxygen moves from areas of high partial pressure (in the alveoli) to areas of low partial pressure (in the blood), and carbon dioxide moves in the opposite direction.
- **Conclusion:** This statement is **True (T)**.

### Step 3: Analyze Statement (iii)
**Statement (iii): Carbon dioxide cannot be transported with haemoglobin.**
- Carbon dioxide can indeed bind to hemoglobin to form carbaminohemoglobin. While a significant portion of carbon dioxide is transported in the form of bicarbonate ions, a portion (about 23%) is carried bound to hemoglobin.
- **Conclusion:** This statement is **False (F)**.

### Step 4: Analyze Statement (iv)
**Statement (iv): Earthworm respires through parapodia.**
- Earthworms respire through their moist skin, not through parapodia. Parapodia are structures found in some annelids (like polychaetes) but not in earthworms.
- **Conclusion:** This statement is **False (F)**.

### Final Summary of Statements:
- (i) True (T)
- (ii) True (T)
- (iii) False (F)
- (iv) False (F)

### Correct Option:
The correct option stating which ones are true (T) and which ones are false (F) is:
- (i) T
- (ii) T
- (iii) F
- (iv) F