Choose the correct answer :
If the high altitude birds become rare or extinct , the plants which may disappear long with them are :

Options

A. Pine
B. Oak
C. Orchids
D. Rhododendrons

Answer

To solve the question about which plants may disappear if high altitude birds become rare or extinct, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Birds**: High altitude birds play a crucial role in the ecosystem, particularly in the process of pollination. Pollination is essential for the reproduction of many plants.

**Hint**: Think about how birds contribute to the life cycle of plants.

2. **Identify the Function of Birds in Pollination**: Birds help transfer pollen from the male part of a flower (anther) to the female part (stigma). This process is vital for fertilization and the production of seeds.

**Hint**: Consider what would happen to plant reproduction if birds were removed from the ecosystem.

3. **Consider the Impact of Bird Extinction**: If high altitude birds become extinct, the plants that rely on them for pollination may also decline or disappear. This is because without birds, the necessary transfer of pollen cannot occur.

**Hint**: Reflect on the relationship between specific birds and the plants they pollinate.

4. **Identify Plants at High Altitudes**: At high altitudes, certain plants like Rhododendrons are known to thrive. These plants are likely dependent on high altitude birds for their reproduction.

**Hint**: Think about which plants are typically found in high-altitude environments and their ecological relationships.

5. **Select the Correct Answer**: Given that Rhododendrons are the only plants listed that are found at high altitudes and rely on birds for pollination, they would be the plants that may disappear if high altitude birds become rare or extinct.

**Hint**: Look for the specific plant mentioned in the question options that is associated with high altitude.

### Final Answer:
The plants that may disappear along with high altitude birds are **Rhododendrons** (Option D).