The correct sequence of embryonal development in Capsella is

Options

A. Torpedo `to` Heart shaped `to` Globular stage
B. Heart shaped `to` Globular `to` Torpedo stage
C. Globular `to` Heart shaped `to` Torpedo stage
D. Heart shaped `to` Globular `to` Torpedo stage

Answer

To determine the correct sequence of embryonal development in Capsella (also known as shepherd's purse), we can break down the process into distinct stages. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Zygote Formation**: The process begins with the formation of a zygote, which occurs after the fertilization of the egg cell by the male gamete.

2. **Transverse Division**: The zygote undergoes a transverse division, resulting in two cells: a terminal cell and a basal cell.

3. **Suspensor Development**: The basal cell develops into the suspensor, which plays a crucial role in anchoring the embryo and facilitating nutrient transfer.

4. **Embryo Proper Formation**: The terminal cell undergoes multiple divisions to form a three-dimensional structure known as the embryo proper.

5. **Globular Stage**: The first recognizable stage of the embryo proper is the globular stage, where the embryo begins to take shape.

6. **Heart Stage**: As development continues, the embryo transitions into the heart stage, characterized by the formation of two cotyledons near the shoot apex, giving it a heart-like appearance.

7. **Torpedo Stage**: The next stage is the torpedo stage, where the cotyledons elongate, and the embryo becomes more elongated and torpedo-shaped.

8. **Mature Embryo**: Finally, the mature embryo is formed, which includes the embryonic root (radicle) and the shoot apical meristem.

### Correct Sequence:
1. Globular Stage
2. Heart Stage
3. Torpedo Stage
4. Mature Embryo

Thus, the correct sequence of embryonal development in Capsella is: **Globular Stage → Heart Stage → Torpedo Stage → Mature Embryo**.

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