Which of the following statements is false ?

Options

A. The ovaries in frog are stucturally and functionally connected with kidneys
B. A mature female frog can lay 2500 to 3000 unfertillised ova at a time
C. In male frog there are 10 - 12 vasa efferentia arise from testes and enter kidneys on their side and open into Bidder's canal
D. The eggs of frog are mesolecithal and telolecithal

Answer

To determine which statement is false among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement 1**:
- The statement claims that the ovaries in frogs are structurally and functionally connected with the kidneys.
- **Evaluation**: This statement is false. In frogs, the ovaries are not connected to the kidneys; they are separate structures.

2. **Analyze Statement 2**:
- The statement claims that a mature female frog can lay 2500 to 3000 unfertilized ova at a time.
- **Evaluation**: This statement is true. Mature female frogs can indeed lay a large number of eggs, typically in the range of 2500 to 3000.

3. **Analyze Statement 3**:
- The statement claims that in male frogs, there are 10-12 vas deferens that arise from the testes and enter the kidneys, opening into Bidder's canal.
- **Evaluation**: This statement is true. Male frogs have 10-12 vas deferens that connect the testes to the Bidder's canal, which is involved in sperm transport.

4. **Analyze Statement 4**:
- The statement claims that the eggs of frogs are mesolecithal and telolecithal.
- **Evaluation**: This statement is true. Frog eggs are classified as mesolecithal, meaning they have a moderate amount of yolk that is unevenly distributed.

### Conclusion:
- After evaluating all four statements, we find that **Statement 1** is the false statement. The ovaries in frogs are not connected to the kidneys.

### Final Answer:
The false statement is **Option 1**: "The ovaries in frogs are structurally and functionally connected with kidneys."

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