Q1. ___________ animal is called a friend of farmers.
Earthworm animal is called a friend of farmers.
Updated on: 2026-03-31 | Author: Rahul Patil
Earthworm animal is called a friend of farmers.
Phylum Porifera
Starfish can regenerate it’s broken body part.
Arthropoda : Largest phylum : : Mollusca : Second largest phylum
True
Class Aves and Class Mammalia
Class Mammalia
Class Pisces
| Type | Example | |
| A) | Pisces | Rohu, Pomfret, Sea horse, Shark, Electric ray, Sting ray, etc. |
| B) | Amphibians | Frog, toad, salamander, etc. |
| C) | Mammalians | Elephant, human, kangaroo, dolphin, bat, etc. |
| D) | Reptilians | Tortoise, lizard, snake, etc. |
| Butterfly | Bat | |
| 1. | It belongs to phylum Arthropoda. | It belongs to phylum Chordata. |
| 2. | It has jointed appendages. | It does not have jointed appendages. |
| 3. | It has four wings for flying. | It has patagium that functions as a wing. |
| 4. | Body is divisible into head, thorax, and abdomen. | Body is divisible into head, neck, trunk, and tail. |
| 5. | Exoskeleton is chitinous. | Exoskeleton is in the form of hairs. |
| 6. | They are cold-blooded organisms. | They are warm-blooded organisms. |
| Aves | Mammalia | |
| i. | Mammary glands are absent. | Mammary glands are present. |
| ii. | They are completely adapted for aerial life. | They are mostly terrestrial animals with some exceptions like dolphin, bat, etc. |
| iii. | Body is divided into head, neck and trunk. | Body is divided into head, neck, trunk and tail. |
| iv. | Exoskeleton is present in the form of feathers. | Exoskeleton is present in the form of hairs or fur. |
| v. | Digits are covered with scales and bear claws. | Digits are provided with nails, claws or hooves. |
| e.g. | Peacock, penguin, parrot, pigeon, duck. etc. | Elephant, human, kangaroo, dolphin, bat, etc. |
| Pisces | Amphibia | |
| i. | They are marine or freshwater animals. | They can live in water as well as on land. |
| ii. | Exoskeleton is in the form of scales. | Exoskeleton is absent in these animals. |
| iii. | They have paired or unpaired fins for swimming. | They do not have fins. They have two pairs of appendages and their digits are without claws. |
| iv. | Aquatic respiration takes place through gills. | Larvae of amphibians are strictly aquatic and perform aquatic respiration only. Adults can perform aquatic as well as aerial respiration |
Spider
Lizard
Kangaroo
Nereis
Crow
Tube-feet
Flat worms : Bisexual : : Round worms : Unisexual
The advantages of animal classification are as follows:
Classification facilitates the identification of animals with great accuracy.
The study of animals becomes convenient.
It helps in understanding the relationship of animals with other living organisms.
It helps to understand the habitat of each animal along with its role in nature.
By studying few animals from a group, we can gain a better understanding about the entire group.
It helps in understanding different adaptations shown by animals.
It gives an idea about the evolution of animals.
Reptiles are poikilotherms, i.e. cold-blooded animals.
Unlike homeothermic animals like mammals and birds, they are unable to regulate their body temperature internally.
Their body temperature depends directly on the external surroundings.
They can control their body temperature only by moving to an environment with a suitable ambient temperature.
Thus, the body temperature of reptiles is not stable.
Earthworms loosen the soil by burrowing deep into it, thus they help to aerate the soil.
This continuous digging of soil also helps the water to reach the roots quickly.
Earthworms can decompose the organic matter from the soil and convert it into rich manure.
This helps in increasing the fertility of the soil, which ultimately increases crop production.
Thus, earthworm is said to be farmer’s friend.
The mouth of jellyfish is surrounded by tentacles.
The tentacles possess cnidoblasts which are used for capturing prey or for defense.
When our body comes in contact with the tentacles of jellyfish, these cnidoblasts penetrate our skin as a defensive action.
Cnidoblast injects the toxin in our body and thus, our body irritates if it comes in contact with jellyfish.
Tortoises that live on land use their lungs to breathe.
When in water, it extends its nares (nasal apertures) and breathes air.
It cannot absorb oxygen dissolved in water. In both habitats, it breathes through its lungs.
This is not the case with real amphibians, however. They can breathe in water through their skin and out on land via their lungs.
Tortoises also have an exoskeleton, which is absent in Amphibia. As a result, the tortoise cannot be classified as an amphibian.
Tentacles are useful for capturing the prey, whereas cnidoblasts penetrate the skin as a defensive action and inject toxins into the body of the harmful insects thus destroying them.
Earthworm locomote using setae.
Starfish locomote using tube feet.
Body of sea anemone has cnidoblast-bearing tentacles which help it to protect itself.
Body of Hemichordates is divided into three parts as proboscis, collar and trunk.
Phylum Mollusca is the class where animals have soft bodies, often protected by a hard shell. Examples include snails, clams, and octopuses.
Phylum Annelida
The lady bug beetle lives on biting worm, white fly worm, white moth, flower insects and bread worms.
Lady bug beetles are red or yellow or grey coloured.
The lifecycle of this insect follows eggs, larvae, cocoon and moth stages.
Lady bug beetles are predatory insects that help farmers in destroying harmful insects.
False
Mammals : Breathing through lungs : : Pisces : Breathing through gills
My body is spindle shaped to minimize water resistance.
Earthworm belongs to phylum Annelida.
Starfish belongs to phylum Echinodermata.
The animals shown in the figure belong to the same phylum (Arthropoda) due to the following common characteristics:
i. They have jointed appendages, which is the characteristic feature of members belonging to phylum Arthropoda.
ii. Their body is triploblastic, eucoelomate, bilaterally symmetrical, segmented and divisible into head, thorax and abdomen.
iii. Their exoskeleton is chitinous.
The exoskeleton of these animals is made up of chitin.
Crab, spider, millipede, centipede, cockroach, honey bee, etc.
Phylum Aschelminthes
False
Porifera : Asymmetrical : : Cnidaria : Radially symmetrical
Numerous pores on the body of Spongilla are called as Ostia and Oscula.
Tapeworm : Phylum Platyhelminthes : : Intestinal worms : Phylum Aschelminthes
True
The body of animals in phylum Coelenterata/Cnidaria is radially symmetrical and diploblastic.
Osculum
Ostia
Coelenterata/Cnidaria
Phylum Coelenterata/Cnidaria
The body is divided into head, neck and trunk
Crocodile and Alligator belong to Phylum Chordata (Class Reptilia)
Crocodiles and alligators do not have gills for breathing underwater.
The animals having vertebral columns in their body are called as vertebrates.
Tube feet are the locomotory organs of the animal (Starfish) given in the picture.
Hookworms range from 8 to 15 mm in length.
Cnidoblasts which are used for capturing prey or for defense.
Animals belonging to the class Amphibia, e.g. frog, toad, salamander, etc. don’t have a neck.
Butterfly, honeybee, cockroach, etc. have three pairs of legs.
Bivalve
Explanation:
Bivalves (like mussels, clams, and oysters) are molluscs that have a body enclosed in two hard calcareous (calcium carbonate) shells.
Nereis is a soft-bodied annelid worm, a shark has a cartilaginous skeleton, and Herdmania has a tunic (test) made of tunicin, not a hard calcareous shell.
Doliolum
Bat
Phylum Arthropoda
Collar cells are special types of cells present in animals belonging to the phylum Porifera.
Collar cells help in the movement of water within the body.
Presence of mammary glands is the typical character of members belonging to class Mammalia.
Exoskeleton is in the form of hairs or fur.
They are warm-blooded animals.
Their body is divided into head, neck, trunk and tail.
Digits of mammals are provided with nails, claws or hooves. For e.g. Elephant, humans, kangaroos, dolphin, bat, etc.
Starfish belongs to phylum-Echinodermata.
Starfish is exclusively found in the ocean.
Starfish is triploblastic, eucoelomate and radially symmetrical. Larval forms however are bilaterally symmetrical.
Starfish uses tube feet locomotion and capturing the prey.
Starfish has a good ability of regeneration.
Pisces: Rohu, Pomfret, Sea horse, Electric ray, etc.
Amphibia: Frog, Toad, Salamander, etc.
Reptilia: Tortoise, Lizard, Snake, etc.
All animals of phylum Aschelminthes (roundworms) have pseudocoelom. e.g. Ascaris, filarial worm, Loa Loa, etc.