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CNMS ICSE - 7 Std
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Answer key

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Chapter: 03. Kingdom Animalia

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Section A: Multiple Choice Questions

(d) Both birds and mammals
(b) Nephridia
© Bat
© Arachnids
(b) Starfish
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Section B: Fill in the Blanks

Arthropoda
marsupium
streamlined
Platyhelminthes (or Flatworms)
tentacles
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Section C: True or False

False. Starfish is an invertebrate (belonging to Phylum Echinodermata).
True.
False. Reptiles have dry, scaly skin but they are cold-blooded animals.
True.
True.
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Section D: Differentiate Between

Invertebrates and Vertebrates:
Invertebrates: Backbone and internal skeleton of bones are completely absent.
Vertebrates: Backbone and internal bony skeleton are present.
Amphibians and Reptiles:
Amphibians: Have a three-chambered heart and their body is covered by a slimy, slippery, wet skin.
Reptiles: Have a three-chambered heart (though structurally different/mostly three) and their skin is dry and covered with scales.
Flatworms and Roundworms:
Flatworms (Platyhelminthes): Have thin, soft, flattened, and ribbon-like bodies which may be divided into many segments.
Roundworms (Nemathelminthes): Have long, cylindrical, unsegmented, and sometimes thread-like bodies.
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Section E: Diagram-Based Question

Labels:
1: Eye
2: Gills (or Operculum)
3: Dorsal fin
4: Caudal fin (or Tail fin)
Function of 2 (Gills): Gills are special respiratory organs used by the fish to breathe dissolved oxygen from the water.
Body Shape adaptation: The body is streamlined, which minimizes water resistance and helps the fish swim efficiently.
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Section F: Short Answer Questions

Characteristic features of Kingdom Animalia (Any two):
They are multicellular, nongreen eukaryotes.
They are heterotrophic (cannot manufacture their own food).
Their cells lack a cell wall.
They show limited growth which stops after maturity.
Tapeworm adaptations: It looks like a long, flat ribbon with a small head-like part to attach to the host. Its body segments directly absorb digested food from the host’s intestine.
Molluscs shell and examples:
The hard shell encloses and protects their soft, unsegmented bodies.
Examples: Snail, Octopus, Pearl oyster, or Pond snail.
Reproductive difference: Amphibians must return to water because they lay soft eggs that require water, and their fertilization is external (in water). Reptiles reproduce via internal fertilization and lay eggs covered with protective, leathery, and yolky shells on dry land, making them independent of water bodies for reproduction.
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Section G: Environmental & Everyday Life Applications

Earthworm as the farmer’s friend: The burrowing and soil-feeding habits of earthworms make the soil porous. This increases aeration and allows for the quick absorption of water, which makes the soil highly fertile and promotes plant growth.
Why a bat is a mammal:
Its body is covered with hair (not feathers).
It possesses projecting external ears (birds do not have external ears).
Females have milk-producing mammary glands to nourish their young ones.
Its jaws have teeth, unlike birds which have a toothless horny beak.
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Section H: Long Answer Questions

Four Groups of Phylum Arthropoda:
Crustaceans: Head and thorax are fused; they have many jointed legs. Example: Prawn, Crab, Shrimp, or Lobster.
Insects: Body is divided into three parts (head, thorax, and abdomen); they have three pairs of legs and normally two pairs of wings. Example: Housefly, Butterfly, Mosquito, or Cockroach.
Arachnids: Head and thorax are fused; they have six pairs of appendages, out of which four pairs are walking legs. Example: Spider, Scorpion, or Tick.
Myriapods: Body is long and divided into many segments, with each segment bearing one or two pairs of legs. Example: Centipede (one pair per segment) or Millipede (two pairs per segment).
Features of Mammals and Comparison with Birds:
Mammalian Features: Body covered with hair, presence of external ears, four limbs and a tail, a four-chambered heart, warm-blooded nature, and females possess mammary glands to produce milk and nourish their young ones.
Differences:
Body covering: Mammals are covered with hair, whereas birds are covered with feathers.
Teeth: Mammals have teeth in their jaws, whereas birds have no teeth and possess a horny beak.
Reproduction: Mammals give birth to live young ones (viviparous), whereas birds lay hard-shelled eggs (oviparous).
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