Go through the following statements.
I The mechanism of bird singing lies in the operation of voice box and vibrating bone in bird
II. Bird sings for the communication with their mates during breeding season.
III. Night-blooming flowers are mostly white because they reflect under the moon light, they use there bright/white color and scent to attract insects for pollination.
IV. Bulbul sings early morning in the garden.

Options

A. I & IV are correct
B. ll & Ill are correct
C. III & IV are correct
D. I, II, III & IV are correct

Answer

To analyze the statements provided in the question, we will evaluate each statement one by one to determine their accuracy and relevance.

### Step-by-Step Solution:

1. **Evaluate Statement I**:
- "The mechanism of bird singing lies in the operation of voice box and vibrating bone in bird."
- This statement is true. Birds have a specialized vocal organ called the syrinx, which works in conjunction with other structures to produce sound.

2. **Evaluate Statement II**:
- "Bird sings for the communication with their mates during breeding season."
- This statement is also true. Birds often sing to attract mates and communicate during the breeding season, signaling their presence and readiness to mate.

3. **Evaluate Statement III**:
- "Night-blooming flowers are mostly white because they reflect under the moonlight, they use their bright/white color and scent to attract insects for pollination."
- This statement is true as well. Many night-blooming flowers are white to reflect moonlight, which helps nocturnal pollinators like moths to find them.

4. **Evaluate Statement IV**:
- "Bulbul sings early morning in the garden."
- This statement is true. Bulbuls are known for their melodious songs, particularly in the early morning as part of their territorial and mating behavior.

### Conclusion:
All four statements are accurate. Therefore, the correct option is that all statements are true.