Read the following statements.
P : The taxonomic hierarchy for Brassica campectris can be written as
Plante `rarr` Phanerogamae `rarr` Angiospermae `rarr` Dicotyledonae `rarr` Parietals `rarr` Brassicaces `rarr` Brassica `rarr` campestris.
Q : Tautonym is the taxonomic designation used for certain plants having trinomial nomenclature.
R : A chaaracter present in an ancestral species and shared exclusively by its evolutionary descendants is referred to as synapomorphy.
S : Family Fabaceae is divided into three sub-families, i.e., Leguminosa, Mimosaceae and Caesalpiniaceae.
Whcih of the following combinations of above statements is correct ?

Options

A. P and Q
B. P and R
C. R and S
D. P, R and S

Explanation

To determine which of the statements (P, Q, R, S) are correct, we will analyze each one step by step.

### Step 1: Analyze Statement P
- **Statement P**: The taxonomic hierarchy for Brassica campestris can be written as Plantae → Phanerogamae → Angiospermae → Dicotyledonae → Parietals → Brassicaceae → Brassica → campestris.
- **Analysis**: This statement correctly outlines the taxonomic hierarchy.
- Kingdom: Plantae
- Subkingdom: Phanerogamae
- Division: Angiospermae
- Class: Dicotyledonae
- Order: Parietales
- Family: Brassicaceae
- Genus: Brassica
- Species: campestris
- **Conclusion**: Statement P is correct.

### Step 2: Analyze Statement Q
- **Statement Q**: Tautonym is the taxonomic designation used for certain plants having trinomial nomenclature.
- **Analysis**: This statement is incorrect because "tautonym" refers to a naming convention where the genus and species names are the same, which is primarily used in zoology, not for plants. Trinomial nomenclature is used for subspecies or varieties, not for tautonyms.
- **Conclusion**: Statement Q is incorrect.

### Step 3: Analyze Statement R
- **Statement R**: A character present in an ancestral species and shared exclusively by its evolutionary descendants is referred to as synapomorphy.
- **Analysis**: This statement is correct. Synapomorphy refers to shared derived characteristics that are used to define a group of organisms based on their evolutionary relationships.
- **Conclusion**: Statement R is correct.

### Step 4: Analyze Statement S
- **Statement S**: Family Fabaceae is divided into three sub-families, i.e., Leguminosae, Mimosaceae, and Caesalpiniaceae.
- **Analysis**: This statement is incorrect. Fabaceae is the family name, and it is divided into three subfamilies, which are:
- Faboideae (often referred to as Leguminosae)
- Mimosoideae
- Caesalpinioideae
- **Conclusion**: Statement S is incorrect.

### Final Conclusion
The correct statements are P and R. Therefore, the combination of correct statements is P and R.

### Summary of Correct Statements
- **Correct Statements**: P and R
- **Incorrect Statements**: Q and S

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