Ina mature embryo sac the central cell is

Options

A. Single nucleate
B. Binucleate
C. Four nucleate
D. Eight nucleate.

Answer

To answer the question, "In a mature embryo sac, the central cell is:", we will follow these steps:

### Step 1: Understand the Structure of the Embryo Sac
The embryo sac is the female gametophyte found in angiosperms (flowering plants). It typically contains several cells, including the egg cell, synergids, antipodal cells, and the central cell.

**Hint:** Remember that the embryo sac is a key part of the reproductive structure in flowering plants.

### Step 2: Identify the Central Cell
The central cell is located in the middle of the embryo sac. It is important to note that this cell plays a crucial role in the fertilization process.

**Hint:** Focus on the role of the central cell in fertilization and what it contains.

### Step 3: Determine the Nuclei in the Central Cell
In a mature embryo sac, the central cell contains two polar nuclei. These nuclei are essential for the process of double fertilization that occurs in angiosperms.

**Hint:** Recall that the central cell's nuclei are involved in the formation of the endosperm after fertilization.

### Step 4: Understand the Process of Fertilization
During fertilization, the two polar nuclei can fuse to form a diploid secondary nucleus. This nucleus then fuses with one of the male gametes to form a triploid primary endosperm nucleus, which will develop into the endosperm.

**Hint:** Think about how the central cell contributes to the formation of the endosperm and the significance of the polar nuclei.

### Step 5: Conclusion
Based on the information gathered, we conclude that in a mature embryo sac, the central cell is binucleate, meaning it contains two polar nuclei.

**Final Answer:** The central cell in a mature embryo sac is binucleate.