Which of these options are not a function of ribosomes?
I. It helps in manufacture of protein molecules.
II. It helps in manufacture of enzymes.
III. In helps in manufacture of hormones.
IV. In helps in manufacture of starch molecules.

Options

A. I and II
B. II and III
C. III and IV
D. IV and I

Explanation

To determine which options are not functions of ribosomes, we need to analyze each statement based on what we know about ribosomes and their role in the cell.

### Step-by-Step Solution:

1. **Understanding Ribosomes**: Ribosomes are cellular organelles known as the "protein factories" of the cell. Their primary function is to synthesize proteins by translating messenger RNA (mRNA).

2. **Analyzing the Options**:
- **Option I**: "It helps in manufacture of protein molecules."
- This statement is true. Ribosomes are directly involved in the synthesis of proteins.

- **Option II**: "It helps in manufacture of enzymes."
- This statement is also true. Enzymes are proteins, and since ribosomes synthesize proteins, they indirectly help in the manufacture of enzymes.

- **Option III**: "It helps in manufacture of hormones."
- This statement is not entirely accurate. While some hormones are proteins (like insulin), not all hormones are synthesized by ribosomes. Hormones can also be steroids or other types that do not involve ribosomes directly. Therefore, this option is questionable.

- **Option IV**: "It helps in manufacture of starch molecules."
- This statement is false. Starch is a carbohydrate and is not synthesized by ribosomes. Ribosomes do not play a role in the synthesis of starch.

3. **Conclusion**: Based on the analysis, options III and IV are not functions of ribosomes. Therefore, the correct answer is that ribosomes do not help in the manufacture of hormones (III) and do not help in the manufacture of starch molecules (IV).

### Final Answer:
The options that are not a function of ribosomes are:
- III. It helps in manufacture of hormones.
- IV. It helps in manufacture of starch molecules.