The plants in which some of the nucellar cells surrounding the embryo sac start dividing and develops into the embryos are :-

Options

A. Citrus and mango
B. Papaya and Citrus
C. Citrus and litchi
D. Mango and guava

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for plants where some nucellar cells surrounding the embryo sac divide and develop into embryos. This process is known as nucellar embryony.

2. **Identifying the Key Terms**:
- **Nucellar Cells**: These are cells surrounding the embryo sac that provide protection and nutrients.
- **Embryo Sac**: The female gametophyte where fertilization occurs.
- **Nucellar Embryony**: A form of asexual reproduction where nucellar cells develop into embryos without fertilization.

3. **Explaining the Process**:
- In typical sexual reproduction, male and female gametes fuse to form a zygote, which develops into an embryo.
- In nucellar embryony, some nucellar cells (initial cells) begin to divide mitotically and form embryos independently of fertilization.

4. **Examples of Plants**:
- The main examples of plants that exhibit nucellar embryony are **citrus** and **mango**. These plants can produce multiple embryos in their ovaries due to the division of nucellar cells.

5. **Distinguishing from Other Plants**:
- Other plants like **papaya**, **lychee**, and **guava** undergo sexual reproduction and do not exhibit nucellar embryony. In these plants, male and female gametes are involved in fertilization.

6. **Final Answer**: The plants in which some of the nucellar cells surrounding the embryo sac start dividing and develop into embryos are **citrus and mango**.