Which of the following types of roots are correctly matched with their examples ?
I. Apogeotropic roots : Rhizophora
II. Absence of calyptra : Lemna
III. Velamen containing roots : vanda
IV. Moniliform roots : portulaca

Options

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

Answer

To solve the question of which types of roots are correctly matched with their examples, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze Apogeotropic Roots:**
- **Definition:** Apogeotropic roots are roots that grow upwards, away from the gravitational pull, instead of downwards.
- **Example:** Rhizophora (a type of mangrove) has roots that grow upwards to access oxygen in waterlogged soils.
- **Conclusion:** This match is **correct**.

2. **Analyze Absence of Calyptra:**
- **Definition:** Calyptra is a protective cap at the tip of a root. Its absence means that the root does not have this structure.
- **Example:** Lemna (duckweed) does not have a calyptra as it is a floating aquatic plant.
- **Conclusion:** This match is **correct**.

3. **Analyze Velamen Containing Roots:**
- **Definition:** Velamen is a multi-layered epidermis found in the aerial roots of some epiphytic plants, which helps in water absorption.
- **Example:** Vanda is an epiphytic orchid that has velamen in its roots.
- **Conclusion:** This match is **correct**.

4. **Analyze Moniliform Roots:**
- **Definition:** Moniliform roots are swollen, bead-like roots that store food.
- **Example:** Portulaca (purslane) has moniliform roots that are swollen and help in storage.
- **Conclusion:** This match is **correct**.

### Final Conclusion:
All four options are correctly matched with their examples. Therefore, the correct answer is that all types of roots listed are correctly matched.