In ornithophilous plants

Options

A. nectar is not secreted
B. nectar is secreted in abundance
C. flowers are dull-coloured
D. flowers are inconspicuous

Answer

**Step-by-Step Solution:**

1. **Understanding Ornithophilous Plants**:
- Ornithophilous plants are those that are pollinated by birds. This type of pollination is characterized by specific adaptations in the flowers that attract birds.

2. **Analyzing the Options**:
- **Option 1**: "Nectar is not secreted."
- This statement is incorrect. Ornithophilous plants typically secrete nectar to attract birds. The flowers are usually large and produce a high amount of nectar.

- **Option 2**: "Nectar is secreted in abundance."
- This statement is correct. These plants have bright, large flowers that produce a significant amount of nectar to attract birds for pollination.

- **Option 3**: "Flowers are dull in color."
- This statement is incorrect. The flowers of ornithophilous plants are usually bright in color to attract birds, as dull colors would not effectively attract them.

- **Option 4**: "Flowers are inconspicuous."
- This statement is also incorrect. Inconspicuous flowers are typically associated with wind pollination, where flowers do not need to attract pollinators with bright colors or scents.

3. **Conclusion**:
- The correct answer is **Option 2**: "Nectar is secreted in abundance." The other options are incorrect based on the characteristics of ornithophilous plants.