Apogeotropic roots forming an association with BGA are observed in

Options

A. Cycas
B. Pinus
C. Banyan
D. Peepal

Answer

To solve the question "Apogeotropic roots forming an association with BGA are observed in," we can follow these steps:

### Step 1: Understand the Terms
- **Apogeotropic Roots**: These are roots that grow away from the gravitational pull of the earth, meaning they exhibit negative geotropism.
- **BGA (Blue-Green Algae)**: These are photosynthetic organisms that can fix nitrogen and often form symbiotic relationships with plants.

### Step 2: Identify the Types of Roots
- There are two types of branching roots:
- **Long-branching Geotropic Roots**: These grow towards the earth.
- **Short-branching Apogeotropic Roots**: These grow away from the earth and are often referred to as coralloid roots due to their irregular, beady appearance.

### Step 3: Recognize the Association
- Coralloid roots contain symbiotic cyanobacteria (like blue-green algae) that help in nitrogen fixation. This association is crucial for the plant's nutrient supply.

### Step 4: Identify the Plant
- The question is asking for a specific plant that has apogeotropic roots associated with BGA.
- The video mentions that these apogeotropic roots are found in **Cycas** (a genus of cycads).

### Step 5: Conclusion
- Based on the information provided, the correct answer to the question is **Cycas**.

### Final Answer
Apogeotropic roots forming an association with blue-green algae are observed in **Cycas**.

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