Biosphere reserves differ from national parks and wildlife sanctuaries because in the former
(a) human beings are not allowed to enter
(b) people are integral part of the system
(c) plants are paid greater attention than the animals
(d) living organisms are brought from all over the world and preserved for posterity.

Options

A. human beings are not allowed to enter
B. people are integral part of the system
C. plants are paid greater attention than the animals
D. living organisms are brought from all over the world and preserved for posterity.

Explanation

To solve the question regarding how biosphere reserves differ from national parks and wildlife sanctuaries, we will analyze each option provided:

1. **Understanding the Options**:
- **(a)** Human beings are not allowed to enter.
- **(b)** People are integral part of the system.
- **(c)** Plants are paid greater attention than the animals.
- **(d)** Living organisms are brought from all over the world and preserved for posterity.

2. **Analyzing Each Option**:
- **Option (a)**: This statement is incorrect. In biosphere reserves, human beings are allowed and often play a role in conservation efforts.
- **Option (b)**: This statement is correct. Biosphere reserves are designed to integrate human activities with conservation, making people an integral part of the ecosystem.
- **Option (c)**: This statement is misleading. While both plants and animals are important in biosphere reserves, the focus is not exclusively on plants over animals.
- **Option (d)**: This statement is also incorrect. Biosphere reserves do not primarily focus on bringing organisms from all over the world; they are more about conserving existing ecosystems.

3. **Conclusion**:
- The correct answer is **(b)** People are integral part of the system. This highlights the unique role of humans in biosphere reserves compared to national parks and wildlife sanctuaries.