Question

Match the following:

Column 1	Column 2
Snake	Identifies fracture in bone
Snail	Work in pair
Earthworm	Fixed points
Fish	Crawl on the ground by alternately looping side ways
Birds	Movement by muscular foot
Cockroach	Move by alternate extension and contraction of the body
Upper part of the ear	Swim by making curves alternately on two sides of the body
Muscles	Cartilage
Skull	Jointed legs
X-ray	Fly by flapping wings

Answer 1

(A) Snakes (IV) Crawl on the ground by alternately looping sideways

1. Snakes are reptiles that do not have any special movement organs hence they move by crawling on the ground by making a loop with their flexible body.
2. These loops help them to push their body forward.

(B) Snail (V) Movement by muscular foot

1. The snails have muscular foot present beneath their body and they come out when they need to move.
2. It also is known to secrete slime which makes its movement smooth.

(C) Earthworm (VI) Move by alternate extension and contraction of the body

1. The earthworm body is segmented into parts, those segments extend and contract and allow them to move under the soil and also on the ground.

(D) Fish (VII) Swim by making curves alternately on two sides of the body

1. Fishes have a streamlined body which makes them swim through the water currents.
2. Their body makes curves that propel them forward and the fins on either side of the body steer the direction for them.

(E) Birds (X) Fly by flapping wings

1. Birds have a special modification in their front limbs forming wings.
2. These wings are bony structures that help them push air and fly by flapping them very fast.

(F) Cockroach (IX) Jointed legs

1. Cockroaches have 3 pairs of jointed legs that are 6 legs in total and they allow them to move around.
2. The jointed legs are a very common character for the members of Arthropoda.

(G) Upper part of ear (VIII) Cartilage

1. Cartilage is a flexible connective tissue that is not as dense as bones and is quite flexible in comparison to bones.
2. The upper part of the ear known as the pinna is made up of the cartilage.

(H) Muscles (II) Work in pair

1. The muscles are known to work in pairs one of them contracts whereas the other relax in order for a complete movement.
2. Such as to fold our arm from the elbow the bicep muscles need to contract whereas the triceps relax.

(I) Skull (III) Fixed joints

1. The skull is made up of various small pieces and is all fixed and deprived of any motion.

(J) X-ray (I) Identifies fracture in a bone

1. X-ray uses a specific wavelength of radiation which can form a clear image of the bony structure in our body and can be used to identify the site of fracture in case of an injury.