Which one is false?

Options

A. in molluscs Gills have respiratory and excretory functions
B. In molluscs the head has sensory tentacles
C. Molluscs are dioecious, oviparous with indirect development
D. None

Answer

To determine which statement is false regarding molluscs, we will analyze each statement provided in the video transcript step by step.

### Step 1: Analyze the first statement
**Statement:** In molluscs, gills have respiratory and excretory functions.
**Analysis:** This statement is true. In molluscs, gills are indeed involved in both respiration (gas exchange) and excretion (removal of waste products). Gills are located in the mantle cavity and play a crucial role in these functions.

### Step 2: Analyze the second statement
**Statement:** In molluscs, the head has sensory tentacles.
**Analysis:** This statement is also true. Molluscs possess sensory tentacles on their heads, which help them respond to environmental stimuli. These tentacles are important for detecting changes in their surroundings.

### Step 3: Analyze the third statement
**Statement:** In molluscs, dioecious organisms are oviparous and have indirect development.
**Analysis:** This statement is true as well. Molluscs are generally dioecious (having distinct male and female individuals), and many species are oviparous (laying eggs). They typically undergo indirect development, which means they have a larval stage before reaching adulthood.

### Step 4: Analyze the fourth statement
**Statement:** There is no false statement here.
**Analysis:** Since all the previous statements about molluscs are true, this statement is also true. Therefore, there is no false statement among the options provided.

### Conclusion
After analyzing all the statements, we conclude that there is no false statement regarding molluscs in the options provided.

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