Passage of pollen grains from anther of one flower to stigma of other flower is

Options

A. Allogamy
B. Chasmogamy
C. Xenogamy
D. Geitonogamy

Answer

To solve the question regarding the passage of pollen grains from the anther of one flower to the stigma of another flower, we can follow these steps:

### Step 1: Understand the Process of Pollination
Pollination is the transfer of pollen grains from the male part of a flower (anther) to the female part (stigma). This process is crucial for fertilization and reproduction in flowering plants.

**Hint:** Remember that pollination can occur within the same flower, between flowers of the same plant, or between flowers of different plants.

### Step 2: Identify the Types of Pollination
There are different types of pollination:
- **Autogamy:** Transfer of pollen within the same flower.
- **Geitonogamy:** Transfer of pollen between different flowers of the same plant.
- **Xenogamy:** Transfer of pollen between flowers of different plants.

**Hint:** Focus on the distinction between self-pollination (autogamy and geitonogamy) and cross-pollination (xenogamy).

### Step 3: Analyze the Given Question
The question specifies the transfer of pollen grains from the anther of one flower to the stigma of another flower. Since it involves different flowers, we need to determine if they are on the same plant or different plants.

**Hint:** The key term here is "other flower," which suggests that it is not the same flower.

### Step 4: Determine the Correct Answer
Since the question refers to the transfer of pollen grains from the anther of one flower to the stigma of another flower on a separate plant, this process is specifically known as **xenogamy**.

**Hint:** Recall that xenogamy refers to cross-pollination between flowers of different plants.

### Final Answer
The passage of pollen grains from the anther of one flower to the stigma of another flower is called **xenogamy**.