Classification of Animals

Rohu

Reason — Rohu is a fish.
Tortoise, Sparrow and rat breathes with lungs.

Ostrich

Reason — Ostrich is a flightless bird.
Peacock can fly short distances. House sparrow can fly. Pigeon is a strong flying bird.

Earthworm

Reason — Earthworm is classified under Annelids.
Prawn is a Arthropod (Crustacea). Butterfly is a Arthropod (Insecta). Spider is a Arthropod (Arachnida).

Lizard

Reason — Lizards belong to Class Reptilia and are vertebrates.
Roundworm, Butterfly and Sea anemone are Invertebrate.

Platyhelminthes

Reason — Liver fluke belongs to Platyhelminthes.
Nematoda have a complete digestive system, but liver flukes have incomplete digestive system. Annelida are segmented worms with ring-like body divisions but liver fluke is not segmented. Cnidaria are radially symmetrical animals and have stinging cells.

Teeth

Reason — Birds have jaws provided with horny beak but have no teeth.
Birds have scales on their legs and feet. The beak (bill) is a defining feature of birds. It is used for feeding, preening, defense, and other functions. Birds have claws on their toes, especially in perching, hunting, and grasping species.

Tube feet

Reason — Echinoderms move with the help of tube feet.
Tentacles are found in animals like Hydra, jellyfish, and cephalopods (octopus, squid). Echinoderms do not use tentacles for movement.Jointed legs are a characteristic of Arthropoda, Echinoderms do not have jointed appendages. Fins are locomotory structures in fish, Echinoderms are not fish and do not have fins.

Both (1) and (3)

Reason — Both Coelenterata and Echinodermata have radially symmetrical bodies.
Platyhelminthes show bilateral symmetry, not radial.

Reptilia

Reason — Reptiles have dry and scaly skin.
Birds have dry skin, but it is not scaly like reptiles. Amphibians have moist, smooth skin. Fishes have moist, slimy skin with scales, but not dry skin.

Four pairs of legs

Reason — Arachnids have four pairs of jointed legs.
Six legs are a feature of Insects. Arachnids do have a body divided into two main regions (cephalothorax and abdomen). Nephridia are excretory organs found in annelids.

A is true but R is false.

Reason — A is true as Tapeworm has a long, ribbon-like, segmented body. It lives as a parasite in the human intestine.
R is false as tapeworm does not belong to Annelida. It belongs to Platyhelminthes.

Therefore, A is true but R is false is the correct option.

A is true but R is false.

Reason — A is true as insect's body is divided into three regions - head, thorax and abdomen.
R is false as insects have three pairs of legs, and all legs are attached only to the thorax, not one pair on each body part. Head and abdomen do not bear legs.

Therefore, A is true but R is false is the correct option.

Both A and R are true and R is the correct explanation of A.

Reason — A is true as most animals show locomotion (movement from one place to another) in search of food, shelter, and mates. Plants are generally fixed in one place (sessile) and do not move from place to place.
R is true as animals are heterotrophs and depend on other organisms for food, so they need to move in search of it. Plants are autotrophs and prepare their own food, so they generally do not move from one place to another.

Therefore, Both A and R are true and R is the correct explanation of A is the correct option.

A is false but R is true.

Reason — A is false as tortoises and crocodiles do not belong to class Amphibia. They belong to Class Reptilia under Phylum Chordata.
R is true as tortoises and crocodiles can live both on land and in water. They reproduce successfully.

Therefore, A is false but R is true is the correct option.

A is true but R is false.

Reason — A is true as most mammals are viviparous. They feed their young with milk produced by mammary glands.
R is false as all mammals, including aquatic (e.g., whales, dolphins) and flying mammals (bats), do feed their young with milk. The environment does not prevent milk feeding.

Therefore, A is true but R is false is the correct option.

1. Fixed animal with a pore-bearing body — Sponge

2. Star-shaped body — Starfish

3. Can live in water as well as on land — Frog

4. Has a flattened ribbon-like body — Tapeworm

CLASSIFICATION :

• Butterfly, Grasshopper, Honeybee and Scorpion are Arthropods.

The scientific name for such organisms is Heterotrophs.

1. Amphibia
   Example — Frogs

2. Porifera
   Example — Sponge

3. Arthropoda
   Example — Crabs

4. Pisces
   Example — Rohu

5. Annelida
   Example — Earthworms

1. Odd one — Dogfish
   Category of the remaining terms — Coelenterata

2. Odd one — Starfish
   Category of the remaining terms — Pisces

3. Odd one — Mammalia
   Category of the remaining terms — Arthropoda

4. Odd one — Frog
   Category of the remaining terms — Reptiles

5. Odd one — Fins
   Category of the remaining terms — Locomotory structures in invertebrates

1. Amphibians breathe through lungs and skin.
2. Slimy scales are found on the body of fish.
3. Gills are covered and protected by an operculum.
4. Ascaris is an unsegmented roundworm.
5. Arachnids have four pairs of jointed legs.

1. Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, and Echinodermata.
2. Pisces, Amphibia, Reptilia, Aves, and Mammalia.
3. Crustacea, Myriapoda, Insecta, and Arachnida.
4. Head, Thorax, and Abdomen.
5. Ostrich, Penguin, and Kiwi.

1. Heterotrophs — Heterotrophs are organisms that cannot produce their own food and obtain nutrients by consuming other organisms.

2. Locomotion — Most animals move from one place to another mainly in search of food or shelter. Such a movement is called locomotion.

3. Invertebrates — The animals that do not have a back bone are called invertebrates.

4. Vertebrates — Animals with a backbone (vertebral column) are called vertebrates.

5. Mammals — Mammals are animals that gives birth to young ones (babies), and feeds its young on milk from the mother's body. Mammals have body covered with hair, possess projecting external ears, have four limbs, and a tail (except humans).

1. Tentacles — Tentacles are found in Cnidarians. These finger-like projections surrounding the mouth, called tentacles help in catching food and swimming.

2. Nephridia — Nephridia are found in Annelids. Nephridia are special organs for excretion.

3. Gills — Gills are found in Class Pisces. Gills help fishes breathe.

4. Muscular foot — Muscular foot is found in Molluscs. Mulluscs move with the help of a muscular foot.

5. Mammary glands — Mammary glands are found in mammals (females). Young ones suckle milk from mammary glands present in mothers.

1. Amphibians — Frog, Toad

2. Segmented worms — Earthworm, Leech

3. Reptiles — Lizard, Snake

4. Coelenterates — Hydra, Jellyfish

5. Arthropods — Prawn, Ant

6. Flatworms — Tapeworm, Liverfluke

Two animals which are found as parasites inside the human intestine are Tapeworm and Roundworm.

Diagram of fish is given below —

1. Fishes belong to Class Pisces of Phylum Chordata.

2. Their streamlined body, which is narrow at both ends help reduce water resistance, allowing for more efficient and faster swimming.

3. Fishes do not breathe through nostrils, but through gills. Fish nostrils are used to detect chemicals in the water, aiding in finding food, identifying potential mates, and detecting danger.

4. Fishes breathe through the gills. The locomotory structures in fishes are their fins, which help in swimming.

5. Two examples of fishes are — Rohu and Catla.

1. Organism [A] is Sea-anemone, and Organism [B] is Hydra.

2. The guidelines 1 and 2 show:
   1 → Tentacles
   2 → Mouth

3. Yes, they both belong to the same Phylum, i.e. Cnidaria of Invertebrates.

4. Two important functions of Tentacles are:

   1. Tentacles help in catching food.
   2. Tentacles help in swimming.

5. We can see budding in Hydra, which is a form of asexual reproduction. This process involves the development of a new individual from an outgrowth or bud on the parent's body.

1. The given figure shows a Starfish. It belongs to phylum Echinodermata.

2. The locomotory structure present in Starfish are Tube feet.

3. Starfish are radially symmetrical.

4. Echinoderms are mainly found in marine habitat.

5. Starfish body is rough, spiny and radially symmetrical.

1. The animal shown in the given figure is Rabbit.

2. Rabbit belongs to Class Mammalia of Phylum Chordata.

3. A key distinguishing feature of the phylum Chordata is the presence of a backbone (vertebral column).

4. Two more examples of organisms belonging to Phylum Chordata are — Tiger and Elephant.

5. Rabbits, like all mammals, are warm-blooded (endothermic), meaning they can regulate their body temperature internally.

Three characteristic features of Amphibians which help to differentiate them from fishes are:

1. They can live in water as well as on land.
2. They breathe through lungs and skin.
3. Body is covered by a slimy and slippery skin

The fishes have streamlined body which means that their body is narrow at both ends. This helps them to swim by minimizing the resistance of water.

The respiratory organ of fish is gills.

Two characteristic features of birds which enable them to fly are:

1. Their bones are hollow and light which make their body light.
2. They have wings to fly.

Two birds which cannot fly are Ostrich and Kiwi.

(a) The black ant belongs to the phylum Arthropoda.

(b) The three body segments are head, thorax and abdomen.

(c) The hard outer covering is made of chitin, that forms the exoskeleton.

(d) Two more examples of organisms from the same phylum are spider and butterfly.

(e) The sensory structures present on the ant's head are called antennae.