Assertion : Sponges do not show any animal nature.
Reason : Sponges are sessile with no apparent way of capturing food or eliminating water

Options

A. Both statements are correct
B. Both statements are incorrect
C. Only statement - I is correct
D. Only statement - II is correct

Answer

To solve the assertion-reason question regarding sponges, we will analyze both the assertion and the reason step by step.

### Step 1: Understanding the Assertion
The assertion states that "Sponges do not show any animal nature." This is a claim that needs to be evaluated based on scientific understanding.

**Hint:** Consider the characteristics that define animal nature, such as cellular structure, mode of nutrition, and life cycle.

### Step 2: Evaluating the Reason
The reason provided is "Sponges are sessile with no apparent way of capturing food or eliminating water." This statement describes the physical characteristics and feeding mechanism of sponges.

**Hint:** Think about how sponges feed and their structural features compared to other animals.

### Step 3: Historical Context
In 1857, scientist Robert Grant recognized and proved the true animal nature of sponges. He demonstrated that sponges do exhibit characteristics typical of animals, such as feeding on solid particles and having a holozoic mode of nutrition.

**Hint:** Research the contributions of Robert Grant and how they relate to the classification of sponges.

### Step 4: Characteristics of Sponges
Sponges are indeed sessile, meaning they are fixed in one place and do not move. However, they possess a unique feeding mechanism where they filter food particles from water. Their cells lack cellulose, which is a characteristic of plant cells, further supporting their classification as animals.

**Hint:** Compare the cellular structure of sponges with that of plants and other animals.

### Step 5: Conclusion on Assertion and Reason
While sponges are sessile and have a simple digestive system, they do exhibit animal characteristics. Therefore, the assertion that "sponges do not show any animal nature" is incorrect. The reason, while describing a true aspect of sponges, does not support the assertion.

**Hint:** Reflect on the definitions of animal nature and how sponges fit into that definition despite their unique characteristics.

### Final Answer
Both the assertion and the reason are incorrect. The correct conclusion is that sponges do show animal nature, and the reason does not justify the assertion.