Which of the following statement is correct ?
(A) Thorn of Bougainvillea and tendrill of Cucubita show analogy
(B) Homologous organs are pentadactyl organ of man cheetah and whale , they are modified forelimbs
© Archaepteryx is modern bird of Mesozoic era
(D) Sweet potato and potato are the example of analogy

Options

A. A, B & D
B. B & D
C. Only C
D. Only B

Answer

To determine which of the statements is correct, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze Statement (A)**:
- **Statement**: Thorn of Bougainvillea and tendril of Cucurbita show analogy.
- **Analysis**: This statement is incorrect. The thorn of Bougainvillea and the tendril of Cucurbita are not analogous; they are homologous organs. Although they serve different functions (protection vs. climbing), they share a common origin.

**Hint**: Remember that homologous organs have a similar structure but may serve different functions, while analogous organs serve similar functions but have different structures.

2. **Analyze Statement (B)**:
- **Statement**: Homologous organs are pentadactyl organs of man, cheetah, and whale; they are modified forelimbs.
- **Analysis**: This statement is correct. The forelimbs of these animals have the same basic structure (pentadactyl pattern) but are modified for different functions (grasping, running, swimming).

**Hint**: Look for examples of homologous organs that share a common structure but have evolved for different purposes.

3. **Analyze Statement (C)**:
- **Statement**: Archaeopteryx is a modern bird of the Mesozoic era.
- **Analysis**: This statement is incorrect. Archaeopteryx is not a modern bird; it is considered a transitional fossil between reptiles and birds from the Jurassic period.

**Hint**: Consider the classification of Archaeopteryx and its significance in evolutionary biology.

4. **Analyze Statement (D)**:
- **Statement**: Sweet potato and potato are examples of analogy.
- **Analysis**: This statement is correct. Sweet potato (a stem modification) and potato (a root tuber) serve the same function of food storage but originate from different structures.

**Hint**: Identify organs that perform similar functions but arise from different evolutionary paths.

### Conclusion:
- The correct statements are (B) and (D). Therefore, the answer is that both statements B and D are correct.

### Final Answer:
**Option 2: Statements B and D are correct.**