In Botanical nomenclature of plants
(a) Both genus and species are printed in italics
(b) Genus and species may be of same name
(c) Both in genus and species the first letter is capital
(d) Genus is written after the species

Options

A. Both genus and species are printed in italics
B. Genus and species may be of same name
C. Both in genus and species the first letter is capital
D. Genus is written after the species.

Answer

To answer the question regarding the rules of botanical nomenclature of plants, let's analyze each option step by step:

1. **Understanding Botanical Nomenclature**:
- Botanical nomenclature is the scientific naming system for plants, governed by the International Code of Nomenclature for Algae, Plants, and Fungi.
- It consists of two parts: the genus name and the specific epithet (species name).

2. **Evaluating Each Option**:
- **Option (a)**: Both genus and species are printed in italics.
- This statement is **correct**. In botanical nomenclature, both the genus and species names are italicized when printed. If handwritten, they should be underlined.

- **Option (b)**: Genus and species may be of the same name.
- This statement is **incorrect**. The genus and species cannot have the same name; they must be distinct.

- **Option (c)**: Both in genus and species the first letter is capital.
- This statement is **incorrect**. The first letter of the genus is capitalized, but the species name is written in all lowercase letters.

- **Option (d)**: Genus is written after the species.
- This statement is **incorrect**. In the correct format, the genus name is always written first, followed by the species name.

3. **Conclusion**:
- The only correct statement about botanical nomenclature is **Option (a)**: Both genus and species are printed in italics.

### Final Answer:
The correct answer is **(a) Both genus and species are printed in italics**.