Consider the following statements.
I. Period of life span from birth till the developmentof reproductive ability is called juvenile period.
II. Reproduction flourishes in maturity.
III. Tissue deterioration is a sign of senescence
IV. Death marks the end of all the phases of life.
Choose the correct ones.

Options

A. I, III and IV
B. I, II and IV
C. II, III and IV
D. All of these

Answer

To determine which statements are correct regarding the phases of life and reproduction, let's analyze each statement step by step:

1. **Statement I**: "Period of life span from birth till the development of reproductive ability is called juvenile period."
- **Analysis**: This statement is accurate. The juvenile period refers to the stage in an organism's life from birth until it reaches sexual maturity, which is when it can reproduce.
- **Conclusion**: This statement is correct.

2. **Statement II**: "Reproduction flourishes in maturity."
- **Analysis**: This statement is also true. The maturity phase is when an organism is fully developed and capable of reproduction, leading to successful reproduction.
- **Conclusion**: This statement is correct.

3. **Statement III**: "Tissue deterioration is a sign of senescence."
- **Analysis**: This statement is correct as well. Senescence, or aging, is characterized by the decline in physiological functions, including tissue deterioration. As tissues degrade, organ function declines, which is a hallmark of aging.
- **Conclusion**: This statement is correct.

4. **Statement IV**: "Death marks the end of all the phases of life."
- **Analysis**: This statement is accurate. Death signifies the conclusion of an organism's life and all the biological phases it has gone through.
- **Conclusion**: This statement is correct.

**Final Conclusion**: All four statements are correct. Therefore, the correct answer is that all of these statements are true.

### Summary of Steps:
1. Analyze Statement I: Confirmed correct.
2. Analyze Statement II: Confirmed correct.
3. Analyze Statement III: Confirmed correct.
4. Analyze Statement IV: Confirmed correct.