The document is a practice worksheet for Grade 7 Biology focusing on the classification of animals, including various categories of invertebrates and vertebrates, their characteristics, and functions of specific anatomical structures. It includes short answer questions on definitions, examples of different animal classes, and comparisons between animal phyla. Additional sections contain long-answer questions related to diagrams of fishes, sea anemones, and rabbits, emphasizing their distinctive features and habitats.

1. PAGE NO. 1
PRACTICE WORKSHEET 2024 -25
GRADE 7
BIOLOGY
CHAPTER NAME- CLASSIFICATION OF ANIMALS
Short answer questions:
1. Name the following:
Eight phyla of Invertebrates:
• Porifera
• Cnidaria (Coelenterata)
• Platyhelminthes
• Nematoda
• Annelida
• Mollusca
• Arthropoda
• Echinodermata
(ii) Five classes of Vertebrates:
• Mammals
• Birds (Aves)
• Reptiles
• Amphibians
• Fish (Pisces)
(iii) Four classes of Arthropoda:
• Insecta (Insects)
• Arachnida (Spiders, Scorpions)
• Crustacea (Crabs, Lobsters)
• Myriapoda (Centipedes, Millipedes)
(iv) Three main regions of the body of Arthropods:
• Head
• Thorax
• Abdomen

2. PAGE NO. 2
(v) Three flightless birds:
• Ostrich
• Kiwi
• Penguin
2. Define the terms given below:
(i) Heterotrophs: Organisms that cannot produce their own food and rely on other sources of
organic carbon, primarily plant or animal matter.
(ii) Locomotion: The movement or the ability to move from one place to another.
(iii) Invertebrates: Animals that do not possess a vertebral column (backbone).
(iv) Vertebrates: Animals that have a vertebral column (backbone).
(v) Mammals: A class of vertebrate animals characterized by the presence of mammary glands
which produce milk, fur or hair and projecting external ears.
3. Write one important function of the following structures along with the group of animals in
which they are found:
(i) Tentacles: Used for capturing food and swimming, found in Cnidarians like jellyfish and
anemones.
(ii) Muscular foot: Used for movement and anchorage, found in Mollusca like snails and clams.
(iii) Nephridia: Excretory organs that remove metabolic wastes, found in Annelids like
earthworms.
(iv) Mammary glands: Produce milk to nourish young ones, found in Mammals.
(v) Gills: Used for respiration in aquatic environments, found in Fish and some Amphibians.
4. Give two examples of each of the following:
(i) Amphibians: Frog, Toad

3. PAGE NO. 3
(ii) Coelenterates: Jellyfish, Sea anemone
(iii) Segmented worms: Earthworm, Leech
(iv) Arthropods: Spider, Crab
(v) Reptiles: Snake, Lizard
(vi) Flatworms: Tapeworm, Liver fluke
5. Give names of two animals which are found as parasites in the human intestine.
• Tapeworm
• Roundworm (Ascaris)
6. Write one difference each between the following pairs:
(i) Porifera and Coelenterata:
Porifera Coelenterata
Body is porous i.e. bear many tiny pores to
draw water into the body cavity, and one large
pore to pass it out.
Mouth surrounded by finger like orijections
called tentacles for catching food and
swimming.
(ii) Invertebrates and Vertebrates:
Invertebrates Vertebrates
The animals that do not have a backbone are
called invertebrates
Animals with a backbone are called
Vertebrates.

4. PAGE NO. 4
(iii) Arthropoda and Mollusca:
Arthropoda Mollusca
• Body is divided into three regions-head,
thorax and abdomen.
• Body has jointed legs.
• Soft body which is not segmented,
• Body enclosed in a hard shell.
(iv) Platyhelminthes and Nematoda:
Platyhelminthes Nematoda
• Body thin and flattened
• Mostly live as parasites in the bodies of
other animals.
• Body is rounded and unsegmented.
• Most of them are minute organisms.
long answer questions
1. Draw a neat diagram of a fish and label the five kinds of fins, operculum, and mouth.
answer the following questions:
i. Name the phylum and the class to which fishes belong
• Phylum: Chordata
• Class: Pisces
ii. What is one advantage of their specific body shape?
Their streamlined body shape reduces water resistance, allowing them to swim efficiently.
iii. Do they breathe through nostrils? If not, mention the role of nostrils.
No, they do not breathe through nostrils. Fish use their gills for breathing. The nostrils are
used for smelling.
iv. Mention the breathing and locomotory structures in fishes.
• Breathing structures: Gills

5. PAGE NO. 5
• Locomotory structures: Fins (pectoral fins, pelvic fins, dorsal fin, anal fin, caudal fin)
v. Give any two examples of fishes.
• Rohu
• Dogfish
2. Given alongside are the figures of two organisms. Study the organisms and answer the
following questions:
i. Name the organisms [A] and [B].
A B
• A: Sea anemone
• B: Hydra
ii. Label the guidelines 1 and 2.
1. Tentacles 2. Mouth
iii. Do they belong to the same phylum? Name the phylum.
• Yes, they belong to the same phylum.

6. PAGE NO. 6
• Phylum: Cnidaria
iv. What are the two important functions of part 2?
• Capturing prey
• Swimming
v. Mention the mode of reproduction shown in figure [B]. Is it a kind of asexual or sexual
reproduction?
• Hydra reproduces by budding.
• This is a kind of asexual reproduction.
3. The figure given alongside represents an animal. Study the same and answer the following
questions:
i. Name the animal and write the phylum to which it belongs.
• Animal: Starfish
• Phylum: Echinodermata
ii. Mention the locomotory structure of the animal.
• Tube feet
iii. What kind of symmetry is found in the body of this animal?
• Radial symmetry
iv. Write a suitable habitat where animals of this phylum are found.
• Marine environments

7. PAGE NO. 7
v. Mention one characteristic feature of the body of this animal.
• Move with the help of tube feet.
4. Given alongside is the figure of an animal. Study the same and answer the following
questions:
i. Name the animal.
• Rabbit
ii. Write the phylum and class to which this animal belongs.
• Phylum: Chordata
• Class: Mammalia
iii. Mention one distinguishing feature of this phylum.
• Presence of a vertebral column
iv. Give two more examples of organisms belonging to this phylum.
• Humans
• Elephants
v. Are these animals cold-blooded or warm-blooded? Explain.
• Warm-blooded (endothermic): They can regulate their body temperature internally.
5. Give three characteristic features of Amphibians which help to differentiate them from
fishes.
• Amphibians can live in water as well as on land. while fishes are primarily aquatic.
• Amphibians have moist skin and lungs which aids in respiration, whereas fishes have gills
to do respiration.
6. Why are fishes said to have a streamlined body? Name their respiratory organs.
• Fishes have a streamlined body to reduce water resistance, making it easier for them to
swim.
• Their respiratory organs are gills.

8. PAGE NO. 8
7. Give two characteristic features of birds which enable them to fly. Name any two birds
which cannot fly.
Characteristic features enabling flight:
• Hollow bones that reduce body weight.
• Strong flight muscles attached to a keeled sternum (breastbone).
Two flightless birds:
• Ostrich
• Penguin