Which of the following statement is incorrect?

Options

A. Receptors for taste are located in the feet of insects
B. The development of echinoderms includes a free-swimming dipleurula larva
C. Flame cells in flatworms are for excretion and osmoregulation
D. Alternation of asexual and sexual phases in life cycle of Hydra is called metagenesis

Explanation

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

1. **Receptors for taste are located in the feet of insects.**
- This statement is **correct**. Insects have taste receptors located in various parts of their body, including their feet and antennae, which function similarly to taste buds.

2. **The development of echinoderms includes a free-swimming diplurilla larvae.**
- This statement is also **correct**. Echinoderms, such as sea stars and sea urchins, have a larval stage known as diplurilla, which is free-swimming and ciliated.

3. **Flame cells in flatworms are for excretion and osmoregulation.**
- This statement is **correct** as well. Flame cells are specialized excretory cells found in flatworms (phylum Platyhelminthes) that help in excretion and osmoregulation.

4. **Alteration of asexual and sexual phases in the life cycle of hydra is called metagenesis.**
- This statement is **incorrect**. Hydra does not exhibit metagenesis. Metagenesis refers to the alternation of generations between asexual and sexual forms, which is observed in some cnidarians like Obelia. Hydra primarily exists in the polyp form and does not alternate between polyp and medusa forms.

**Conclusion:**
The incorrect statement is: **"Alteration of asexual and sexual phases in the life cycle of hydra is called metagenesis."**