Question

Match the following

Column A	Column B
1. Vertebrates	a. Fixed joints
2. Earthworms	b. Muscular foot
3. Snail	c. Bristles
4. Cockroach	d. Backbone
5. Skull bones	e. Cerci

Accepted Answer

1-d.

Animals are categorised as vertebrates and invertebrates based on the presence and absence of vertebral column and endoskeleton. The animals which have a backbone are called vertebrates. Fishes, amphibians, reptiles, birds, and mammals are vertebrates.

2-c.

The earthworm does not have bones, they move by the action of two groups of muscles and bristle-like structures called setae. The two groups of muscles include the circular muscles that surround the segments of the body and another group of muscles include the longitudinal muscles that continue along the length of earthworms.

3-b.

Snail is an invertebrate that moves by the muscular foot, which is covered by the mucous which enables them to move.

4-e.

Cerci is the sensory organ of the cockroach, this organ sometimes severs as the organ of copulation and mating.

5-a.

The points at which two or more bones join together are called joints. Joints along with the muscles allow all the movements of the body. There are three types of joints in the body, and they are fixed or immovable joints, partially movable joints, and movable joints. Skull is a fixed joint, it will not move. Skull protects the brain.

The skull consists of the braincase and facial bones. There are 14 bones present in the facial region and 8 bones are in the head region. A total of 22 bones are found in the skull.

Column A Column B

1. Vertebrates d. Backbone

2. Earthworms c. Bristles

3. Snails b. Muscular foot

4. Cockroach e.Cerci

5. Skull bones a. fixed joints

Vaishali Gupta, Shalini Bajaj and, Supriya D.Seshadri Solutions for Exercise 5: Exercises

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