Passive immunity in a child depends on antibodies

Options

A. received through food
B. obtained from its mother
C. acquired from the environment
D. produced from its immune system

Answer

### Step-by-Step Solution:

1. **Understanding Passive Immunity**:
- Passive immunity is a type of immunity that occurs when antibodies are transferred from one individual to another. In this context, it refers to the transfer of antibodies from a mother to her child.

2. **Role of Antibodies**:
- Antibodies are specialized proteins produced by the immune system. They play a crucial role in identifying and neutralizing pathogens like bacteria and viruses.

3. **Transfer of Antibodies During Pregnancy**:
- During the last three months of pregnancy, antibodies are passed from the mother to the fetus through the placenta. This transfer is vital for providing the newborn with immediate protection against infections.

4. **Importance of Maternal Immunity**:
- The amount and type of antibodies transferred to the child depend on the mother’s immune status. A mother with a strong immune system can provide more effective antibodies to her child.

5. **Conclusion**:
- Therefore, passive immunity in a child is dependent on the antibodies acquired from the mother, which helps protect the child during the early stages of life until its own immune system matures.