The plants in which some of the nucellar cells surrounding the embryo sac start dividing protude into the embryo sec 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 Concept**: The question refers to a specific type of reproduction in plants where certain cells surrounding the embryo sac contribute to the formation of embryos. This process is known as "nucellar embryony."

2. **Identifying Key Features**: In nucellar embryony, some of the nucellar cells (which are the cells surrounding the embryo sac) begin to divide and protrude into the embryo sac. These cells then develop into embryos. This process occurs without the need for fertilization of the egg cell.

3. **Examples of Plants**: The question asks for examples of plants that exhibit this type of embryony. According to the information provided, two notable examples are citrus and mango.

4. **Exclusion of Other Plants**: The transcript mentions that plants like papaya and Hillechi guava do not exhibit nucellar embryony. Papaya is unisexual, meaning male and female structures are found on different plants, which prevents this type of embryony. Hillechi guava also undergoes typical fertilization between the egg and male gamete.

5. **Conclusion**: Based on the above points, the plants that exhibit nucellar embryony are citrus and mango. Therefore, the correct answer to the question is these two plants.

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

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