Selina Concise Class 7 Biology Solution Chapter No. 3- ‘Classification of Animals’ For ICSE Board Students.
MULTIPLE CHOICE QUESTION
1.) Tick the appropriate answer.
(i) Identify the aquatic animal with scaly skin which breath with gills—–
(a) Rohu (b) Tortoise (c)Sparrow (d) Rat
Answer: (a) Rohu is the aquatic animal with scaly skin which breath with gills
(ii) Identify the bird which cannot fly—–
(a) Peacock (b) House sparrow (c) Ostrich (d) Penguin
Answer: (c) Ostrich bird cannot fly.
(iii) Identify the animal which not an arthropod——-
(a) Prawn (b) Butterfly (c) Earthworm (d) Spider
Answer: (c) Earthworm is not an arthropod.
SHORT ANSWER QUESTION
1.) Give two examples of each of the following.
(i) Amphibians : Toad and frog
(ii) Segmented worms : Earthworm and Leech
(iii) Reptiles : Lizard and Snake
(iv) Coelenterates: Hydra and Jellyfish
(v) Arthropoda: Centipede and Crab
(vi) Flatworms: Tapeworm and Liver fluke
2.) Give names of two animals which are found as parasites inside the human intestine.
Answer: Roundworms and Flatworms are normally found as parasites inside the human intestine.
3.) Name one example each of an animal which shows the following characteristics:
(i) Fixed animals with a pore-bearing body: Sponges
(ii) Star shaped body : Star fish
(iii) Can live in water as well as on land : Amphibians (Frog)
(iv) Has a flattened ribbon like body : Tapeworm
4.) Write one difference each between the following pairs:
(i) Poriphera and coeleneterata
Poriphera | Coeleneterata |
No symmetry is present. | Radial symmetry is present. |
(ii) Arthropoda and Mollusca
Arthropoda | Mollusca |
They can live in water and on land. | The are mainly aquatic. |
(iii) Invertebrates and vertebrates
Invertebrates | Vertebrates |
They don’t have a backbone. | Contains back bone |
(iv) Platyhelminthes and Nematode
Platyhelminthes | Nematode |
They are flat worms. | They are called round worms. |
5.) Match the animals given under column A with their respective classification group given under column B.
Column A Column B
(i) Sponge (a) Amphibia
(ii) Snail (b) Reptilia
(iii) Butterfly (c) Echinodermata
(iv) Toad (d) Mollusca
(v) Lizard (e) Arthropoda
(vi) Starfish (f) Poriphera
Answer:
Column A Column B
(i) Sponge (f) Poriphera
(ii) Snail (d) Mollusca
(iii) Butterfly (e) Arthropoda
(iv) Toad (a) Amphibia
(v) Lizard (b) Reptilia
(vi) Starfish (c) Echinodermata
6.) Write the characteristics of class Aves with reference to their body covering and jaws.
Answer: The characteristics of class Aves with reference to their body covering and jaws.
(a) Class aves have presence of wings.
(b) Teeth are absent, instead presence of beak.
(c) Jaws are present with home beak.
7.) Categorize the following animals under their appropriate columns of classification.
Animals:
Dog Grasshopper Rat Scorpion Toad
Butterfly Lizard Turtle Frog Bat
Snail Honey bee Pigeon Liverfluke Leech
Cattle Snake Rohu Parrot Ascaris
Earthworm Cow Rabbit Monkey Elephant
Classification :
WORMS | MOLLUSCS | FISHES | AMPHIBIANS | REPTILES | ||
Earthworm | Snail | Rohu | Frog | Lizard | ||
Leech | Toad | Snake | ||||
Liver fluke | ||||||
Butterfly | ||||||
Scorpion | ||||||
Grasshopper | ||||||
Honey bee | ||||||
Ascaris | ||||||
BIRDS | MAMMALS | |||||
Pigeon | Elephant | |||||
Parrot | Dog | |||||
Bat | ||||||
Rat | ||||||
Cattle | ||||||
Cow | ||||||
Rabbit | ||||||
Monkey |
8.) Give 3 characteristic feature of amphibians which help to differentiate them from fishes.
Answer:
Amphibians | Fishes |
Presence of three chambered heart. | Two chambered heart is present. |
They don’t have scales | Scales are present. |
Respiratory organ is lungs. | Respiratory organ is gill. |
9.) Why fishes are said to have a streamlined body ? Name their respiratory organs.
Answer: fishes are said to have a streamlined body, which help them to swim in water and the respiratory organ is gills.
10.) Why arthropods have been given this name ? Name the four classes of phylum arthropod giving one example each of the four classes.
Answer: The arthropod name itself suggest, this class have jointed appendages. They are invertebrates and segmented body, therefore they are called as Arthropods. The 4 classes of phylum Arthropoda are (a) Arachnida : Examples are spider and scorpion (b) Crustacea : Examples are Lobster and crab (c) Insecta : : Examples are insects (d) Pycnogonida : : Examples are sea spiders.
11.) Give two characteristic features of birds which enable them to fly. Name any two birds which cannot fly.
Answer: They are light weight and contains feathers. They have tough beak is present and absence of bones and teeth to decrease the body weight. For example : Ostrich and Kiwi.
12.) Differentiate between flatworms and roundworms.
flatworms | roundworms. |
They are hermaphrodites. | These are unisexual. |
Flatworms are acoelomates. | Roundworms are pseudocoelomates. |
They are Platyhelminthes | They are aschelminths. |
13.) Animals cannot prepare their own food. What scientific name is given to such organisms.
Answer: Animals cannot prepare their own food, because of absence of chloroplast and chlorophyll pigment. Therefore they are called as heterotrophs.