Which of the following is incorrect for hormones ?

Options

A. They are chemical acts as intercellular messengers .
B. They are non-nutrient chemicals .
C. They are always produced in trace amounts .
D. They are species - specific chemicals .

Answer

To determine which statement about hormones is incorrect, we need to analyze each of the provided statements about hormones:

1. **Hormones act as intracellular messengers.**
- Hormones are indeed chemical messengers that facilitate communication between cells. They can act on target cells either by binding to receptors on the cell surface or by entering the cell and acting on intracellular receptors. This statement is correct.

2. **Hormones are non-nutrient chemicals.**
- Hormones are classified as non-nutrient chemicals because they do not provide energy or serve as building blocks for the body. Instead, they regulate physiological processes. This statement is also correct.

3. **Hormones are always produced in trace amounts.**
- Hormones are typically produced in small quantities, which is sufficient for their function in signaling and regulation. This statement is correct as well.

4. **Hormones are species-specific chemicals.**
- This statement is incorrect. While hormones can have specific effects in certain species, they are not strictly species-specific. Many hormones can function across different species due to conserved biological pathways. Therefore, this statement is misleading.

### Conclusion:
The incorrect statement regarding hormones is the fourth one: "Hormones are species-specific chemicals."