In Marchantia and Riccia, Antheridia and Archegonia are produced on - and - thalli respectively.

Options

A. same, same
B. same, different
C. different, same
D. different, different

Answer

To solve the question regarding the production of Antheridia and Archegonia in Marchantia and Riccia, we can break it down into the following steps:

### Step 1: Understand the terms
- **Antheridia**: These are the male reproductive organs that produce sperm.
- **Archegonia**: These are the female reproductive organs that produce eggs.

### Step 2: Identify the reproductive nature of Marchantia
- Marchantia is a dioecious plant, meaning that it has separate male and female individuals.
- In Marchantia, Antheridia (male organs) are produced on male thalli, while Archegonia (female organs) are produced on female thalli.

### Step 3: Identify the reproductive nature of Riccia
- Riccia is a monoecious plant, meaning that it has both male and female reproductive organs on the same individual.
- In Riccia, both Antheridia and Archegonia are produced on the same thallus.

### Step 4: Formulate the answer
- Therefore, for the question: "In Marchantia and Riccia, Antheridia and Archegonia are produced on - and - thalli respectively," the answer is:
- Marchantia: Antheridia on male thalli
- Riccia: Archegonia on the same thallus

### Final Answer
- Antheridia are produced on male thalli in Marchantia, and Archegonia are produced on the same thallus in Riccia.