Exoskeleton

Q. Which of the following organisms have exoskeleton?

1. Nereis
2. Pheretima
3. Leech
4. Housefly

Q.

Triploblastic protostomes with a hard exoskeleton, that may at times have a asymmetrical body plan are included in the phylum____.

1. Annelida

2. Arthropoda

3. Echinodermata

4. Mollusca

Q. Pick the wrong statement(s) from the following:

1. Annelids have a closed circulatory system.
2. Crabs possess an endoskeleton.
3. Animals belonging to Phylum Porifera are exclusively aquatic.
4. Nematocysts are characteristic of Phylum Cnidaria.

Q. Which of the following is not an advantage of the exoskeleton in arthropods and mollusca?

1. Provides protection from predators
2. Provides a rigid place for muscles to insert against which they can do work
3. Enhances sensory perception
4. Permits greater range of movement than body plan without a rigid skeletal structures

Q. State whether true or false:
The exoskeleton of arthropods is made up of lignin.

1. True
2. False

Q. Chitinous exoskeleton and metameric segmentation are features of the phylum

1. Annelida and Arthropoda, respectively
2. Arthropoda and Aschelminthes, respectively
3. Annelida and Aschelminthes, respectively
4. Arthropoda and Annelida, respectively