Which of the following statements are incorrect?
(A) Digestion takes place in spongocoel in sponge
(B) Nitrogenous waste of protozoans is ammonia
(C) Leishmania is a digenetic parasite
(D) Only intracellular digestion takes place in coelenteron of cnidaria

Options

A. A, B, C
B. A, C, D
C. B, C
D. A, D

Answer

To determine which statements are incorrect, let's analyze each statement one by one:

**Step 1: Analyze Statement A**
- Statement A claims that "Digestion takes place in spongocoel in sponge."
- In sponges, digestion occurs within specialized cells called choanocytes, which create food vacuoles. The spongocoel is the central cavity of the sponge, but it is not where digestion occurs. Therefore, this statement is **incorrect**.

**Step 2: Analyze Statement B**
- Statement B claims that "Nitrogenous waste of protozoans is ammonia."
- Protozoans typically excrete ammonia as their nitrogenous waste due to their aquatic environment, where ammonia can be easily diluted. This statement is **correct**.

**Step 3: Analyze Statement C**
- Statement C claims that "Leishmania is a digenetic parasite."
- Leishmania is indeed a digenetic parasite, meaning it requires two different hosts to complete its life cycle (typically a sandfly and a mammal). This statement is **correct**.

**Step 4: Analyze Statement D**
- Statement D claims that "Only intracellular digestion takes place in coelenteron of cnidaria."
- In cnidarians (like jellyfish and corals), digestion occurs both intracellularly (within cells) and extracellularly (in the gastrovascular cavity or coelenteron). Therefore, this statement is **incorrect**.

**Conclusion:**
The incorrect statements are:
- **Statement A**: Digestion takes place in spongocoel in sponge (Incorrect)
- **Statement D**: Only intracellular digestion takes place in coelenteron of cnidaria (Incorrect)

**Final Answer: A and D are incorrect statements.**

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