In case of animals morphology refers to the study of  

Options

A. external appearance of the organs
B. external appearance of parts of the body
C. internal appearance of the organs
D. both 1 and 2 are correct

Answer

To answer the question "In case of animals, morphology refers to the study of," we can break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding Morphology**: Begin by defining what morphology means in the context of animals. Morphology is the branch of biology that deals with the form and structure of organisms.

2. **Focus on External Characteristics**: Morphology specifically refers to the study of external characteristics or features of animals. This includes aspects such as skin color, body shape, size, and overall appearance.

3. **Phenotypic Characters**: Recognize that morphology is concerned with phenotypic characters, which are the observable traits of an organism.

4. **Arrangement of Body Parts**: Consider that morphology also involves the arrangement of body parts and individual organs, which can be observed externally.

5. **Distinction from Anatomy**: It is important to differentiate morphology from anatomy. While morphology focuses on external features, anatomy is the study of internal structures and organs.

6. **Evaluating Options**: Given the options provided in the question:
- Option A: External appearance of the organs (correct)
- Option B: External appearance of the parts of the body (correct)
- Option C: Internal appearance of the organs (incorrect)

7. **Conclusion**: Since both options A and B are correct, the best answer to the question is that morphology refers to the study of the external appearance of both organs and body parts.

### Final Answer:
Morphology in animals refers to the study of the external appearance of the organs and the external appearance of the parts of the body.