Animals living and surviving : Important questions and answers.

A.Which one is correct ?

1. Amphibian live ________

a. on land

b. In water 

c. both a and b 

2. Insects have _________ legs.

a. six

b. five 

c. four

3. A turtle have ________ limbs.

a. two

b. three

c. four

B. Fill in the blanks :

1. Fish breathe with the help of their Gills and swim with the help of Fins .

2. Birds breathe through their lungs, and have a body covered by feathers.

3. Amphibians breathe through their lungs on the land and through moist skin in water.

4. Mosquitoes , beetles and aphids are harmful destructive insects.

C. Write T' for true or 'F' for false :

1. All animals can be divided into four groups. 

Ans: False 

2. Most fish have two sets of paired fins.

Ans: True

3. Gills take in oxygen and give out carbon dioxide.

Ans: True

4. All insects and worms are vertebrates.

Ans: False

D. Match the following:

1. Salmon , gold fiish	A. Reptiles
2. Crow, pigeon, sparrow	B. Amphibians
3. Lizard, crocodile, snake	C. Fish
4. Mouse , goat ,cow	D. Birds
5. Cockroach, ant , beetle	E. Mammals
6. Frog, salamander	F. Insects

Ans: 1-C , 2- D, 3- A , 4 - E, 5 - F, 6- B

Answer the following questions :

1. Give three differences between insects and mammals.

Ans: 

Characteristics	Insects	Mammals
Nature	Invertebrates	Vertebrates
Backbone	Absent	Present
Body Covering	Hard scales	Skin, hair, Fur , etc
Locomotive Organ	Legs , wings	Four limbs Legs, Hands
Breathing Organ	Trachea	Lungs

2.How many feet do insects have? What sort of body covering do they have?

Ans: Insects have six (6) legs , 3 legs on each side to move, crawl, hop or walk.

Insects are invertebrates means they don't have any bones in their body but they have hard body covering which is known as exoskeleton.

Exoskeleton body covering help them to protect body and internal organs.

All insects have their body covered with tiny hard scales.

3. Give two differences a frog and a lizard.

Ans:

Characteristics	Frog	Lizard
Nature	Amphibians	Reptiles
Habitat	Water, land	Land
Body Coverings	Soft and Moist skin	Dry and Hard skin
Breathing Organs	Gills and skin In water ,  Lungs on land	Lungs
Locomotive Organs	Webbed feet	Four short Legs

4. Snakes have no legs. How do they move on land?

Ans: Snakes are reptiles in nature and they don't have have any legs, yet they can move very fast .

Snakes have many scales on the underside of the body which enable them to move .

The scale As it moves forward or backward push the snake against the ground and help to propel 

Thus scales help the snake to grip on the ground and move it's body very fast.

Snake can move easily on rough ground but finds it difficult to crawl on smooth surface. Snake can also swim in the water.