Early development of embryo in dicots and monocots is similar upto:

Options

A. Diad stage
B. Quadrat stage
C. Globular stage
D. Octant stage

Answer

To solve the question regarding the early development of embryos in dicots and monocots, we will analyze the stages of embryonic development and identify where they are similar.

### Step-by-Step Solution:

1. **Understanding the Seed Structure**:
- A seed consists of two main parts: the embryo and the cotyledons. The embryo develops into the young plant, while the cotyledons store food for the embryo.

**Hint**: Remember that the embryo is crucial for plant development, and cotyledons provide necessary nutrients.

2. **Types of Plants**:
- Plants are categorized into two types based on the number of cotyledons:
- **Monocots**: One cotyledon (e.g., grasses).
- **Dicots**: Two cotyledons (e.g., beans).

**Hint**: Focus on the definition of monocots and dicots to understand their differences.

3. **Formation of the Zygote**:
- The embryo begins as a zygote, formed by the fusion of male gametes (pollen) and female gametes (egg cell).

**Hint**: The zygote is the starting point for embryo development.

4. **Embryo Development Stages**:
- The zygote undergoes several rounds of mitosis to develop into an embryo. The stages include:
- **Two-cell stage** (diode stage)
- **Four-cell stage**
- **Eight-cell stage** (octant stage)

**Hint**: Track the progression of cell division from the zygote to identify the stages.

5. **Identifying Similarity in Development**:
- Both dicots and monocots exhibit similar development patterns up to the **octant stage** (eight-cell stage). After this stage, their development diverges.

**Hint**: Focus on the octant stage as the last point of similarity in embryonic development.

6. **Conclusion**:
- The early development of embryos in dicots and monocots is similar up to the **octant stage**.

**Final Answer**: The correct option is **octant stage**.