A. Choose the correct option
1.
Which of the following is not a
vertebrate?
o
(a) Salamander
o
(b)
Jellyfish ✅
o
(c) Whale
o
(d) Frog
2.
Which of the following has a
streamlined body?
o
(a)
Fish ✅
o
(b) Frog
o
(c) Snails
o
(d) Tapeworm
3.
Animals along with their groups are given below:
o
P: Pheretima – Annelida ✔️
o
Q: Snails – Arthropoda ✖️
(Snails belong to Mollusca.)
o
R: Sea Urchin – Mollusca ✖️
(Sea urchin belongs to Echinodermata.)
o
S: Fasciola – Platyhelminthes ✔️
Answer: (c)
P, S ✅
4.
Which of the following is not a
parasite?
o
(a) Roundworm
o
(b) Tapeworm
o
(c)
Earthworm ✅
o
(d) Leech
B. Match the
following
|
Column A |
Column B |
|
1. Fish |
(b) Aquatic |
|
2. Crocodile |
(e) Reptile |
|
3. Birds |
(d) Feathers |
|
4. Mammals |
(a) Hairy skin |
|
5. Frogs |
(c) Amphibian |
C. Name the
phylum based on the characteristics
1.
They have flattened bodies.
o
Platyhelminthes
2.
They have a canal system.
o
Porifera
3.
They have jointed legs.
o
Arthropoda
4.
They have a vertebral column.
o
Chordata
5.
They have an external shell.
o
Mollusca
6.
They have a spiny exoskeleton.
o
Echinodermata
D.
Short-answer questions
1.
What is the main difference between invertebrates and vertebrates?
Answer:
- Invertebrates do not have a backbone or vertebral column.
- Vertebrates possess a backbone or vertebral column.
2.
Write one distinguishing feature for each of the following.
(a)
Porifera
- Body bears numerous pores and has a canal system.
(b)
Platyhelminthes
- Body is flat and unsegmented.
(c)
Echinodermata
- Body has a spiny skin (spiny exoskeleton).
(d)
Mollusca
- Soft, unsegmented body usually protected by a shell.
(e)
Arthropoda
- Jointed legs and a hard exoskeleton.
(f)
Cnidaria
- Tentacles bear stinging cells (cnidoblasts).
3.
How are birds adapted for the aerial habitat?
Answer:
Birds are adapted for flight because:
- They have a streamlined body.
- Forelimbs are modified into wings.
- Their bodies are covered with feathers.
- They have light, hollow bones.
- They possess strong flight muscles.
4.
Give reasons.
(a)
Amphibians can live in water and on land.
Answer:
Amphibians can live both in water and on land because they breathe through gills in the larval stage and through lungs and moist skin in the adult stage.
(b) Fish have
streamlined bodies.
Answer:
Fish have streamlined bodies to reduce water resistance, enabling them to swim
smoothly and quickly.
5.
Differentiate between
(a) Annelida
and Platyhelminthes
|
Annelida |
Platyhelminthes |
|
Body is segmented. |
Body is unsegmented. |
|
Body is cylindrical. |
Body is dorsoventrally flattened. |
|
Mostly free-living. |
Many are parasitic. |
(b)
Arthropoda and Echinodermata
|
Arthropoda |
Echinodermata |
|
Jointed legs are present. |
Jointed legs are absent. |
|
Hard chitinous exoskeleton. |
Spiny exoskeleton/endoskeleton
present. |
|
Bilateral symmetry. |
Adult shows radial symmetry. |
E. Long-answer Questions
1. Write a short
note on the basis of classification (any three).
Answer
Animals are classified on the basis of different characteristics. Any
three are:
(i) Presence or
absence of backbone
- Animals with a vertebral column are called vertebrates.
- Animals without a vertebral column are called invertebrates.
(ii) Body symmetry
- Bilateral symmetry: The body can
be divided into two equal halves by only one plane (e.g., earthworm).
- Radial symmetry: The body can
be divided into similar halves by many planes passing through the centre
(e.g., starfish).
(iii) Body cavity
(Coelom)
- The body cavity between the body wall and internal organs is called
the coelom.
- Animals may be acoelomate, pseudocoelomate, or coelomate
depending on the presence of this cavity.
(Other acceptable bases include segmentation, body
covering, habitat, reproduction, etc., if given in your textbook.)
2. Compare the five classes of vertebrates on the basis of heart,
reproduction and respiration.
|
Class |
Heart |
Respiration |
Reproduction |
|
Pisces |
Two-chambered |
Gills |
Lay eggs (oviparous) |
|
Amphibia |
Three-chambered |
Gills (larva), lungs & skin (adult) |
Lay eggs in water |
|
Reptilia |
Three-chambered (except crocodile has four) |
Lungs |
Lay shelled eggs on land |
|
Aves |
Four-chambered |
Lungs |
Lay hard-shelled eggs |
|
Mammalia |
Four-chambered |
Lungs |
Mostly give birth to young ones and feed them with milk |
3. Draw a diagram of a member of Annelida and write any four
characteristic features.
Diagram: Draw an Earthworm
(Pheretima).
Four characteristics
1.
Body is long and cylindrical.
2.
Body is divided into many ring-like segments.
3.
They are bilaterally symmetrical.
4.
They possess a true coelom.
4. Discuss the special features of Class Mammalia.
Answer
- Body is covered with hair.
- Females possess mammary glands to feed young ones.
- Mostly give birth to young ones.
- Warm-blooded animals.
- Respiration takes place through lungs.
- Heart is four-chambered.
- External ears are present.
- They have well-developed brains.
F. Case-based Questions
I. Identify the
class and write two special features.
1. Crow
Class: Aves
Features
- Body covered with feathers.
- Forelimbs modified into wings.
2. Fish
Class: Pisces
Features
- Respire through gills.
- Streamlined body with fins.
3. Snake
Class: Reptilia
Features
- Dry skin covered with scales.
- Respire through lungs.
4. Frog
Class: Amphibia
Features
- Lives both on land and in water.
- Moist skin.
II. Read the following and answer.
1. Match the
animals (W–Z) with their classes.
|
Animal |
Class |
|
W |
Amphibia |
|
X |
Reptilia |
|
Y |
Aves |
|
Z |
Mammalia |
Answer:
- W → Amphibia
- X → Reptilia
- Y → Aves
- Z → Mammalia
2. Which of the
animals is cold-blooded?
Animal W (Amphibia) and Animal X (Reptilia) are
cold-blooded.
Answer: (a) Animal W
and X ✅
3. Which
characteristic is unique to mammals among the listed features?
Answer:
The unique characteristic is that mammals produce milk through mammary
glands to feed their young ones.
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