Given below shows some characteristics of a phylum .Identify the phylum .
(i) Tissues are absent (ii) Internal fertilization (iii) indirect development (iv) Canal system

Options

A. Cnidaria
B. Porifera
C. platyhelminthes
D. Ctenophora

Answer

To identify the phylum based on the given characteristics, we will analyze each characteristic step by step.

### Step-by-Step Solution:

1. **Analyze the First Characteristic: Tissues are absent**
- This indicates that the organism has a cellular grade of organization rather than a tissue grade. In the animal kingdom, this is a characteristic of simpler organisms.

2. **Analyze the Second Characteristic: Internal fertilization**
- Internal fertilization means that fertilization occurs inside the body of the organism. This is a common feature in many animal phyla, but it is particularly noted in certain groups.

3. **Analyze the Third Characteristic: Indirect development**
- Indirect development refers to a life cycle that includes a larval stage, which is different from the adult form. This is seen in various aquatic organisms.

4. **Analyze the Fourth Characteristic: Canal system**
- The presence of a canal system is a distinctive feature of certain organisms that allows them to filter feed and perform other functions. This is a key characteristic of the phylum we are trying to identify.

5. **Identify the Phylum:**
- Given the characteristics analyzed:
- Tissues are absent (cellular organization)
- Internal fertilization
- Indirect development
- Canal system
- The phylum that matches all these characteristics is **Porifera** (commonly known as sponges). The term "Porifera" means "pore-bearers," which aligns with the presence of a canal system.

### Conclusion:
The phylum identified based on the given characteristics is **Porifera**.

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