Class 3 Maths - Classification - CBSE Worksheets Solutions

Section A: Multiple Choice Questions (MCQs)

Q1: Which of the following is the odd one out?
(a) Dog
(b) Cat
(c) Fish
(d) Apple

Ans: (d)
Explanation: The odd one out is "Apple" as it is not an animal, unlike the other options.

Q2: Select the odd one out from the options below:
(a) Oak
(b) Maple
(c) Rose
(d) Pine

Ans: (c)
Explanation: The odd one out is "Rose" as it is a plant, while the other options are types of trees.

Q3: Identify the odd one out among the given animals:
(a) Lion
(b) Elephant
(c) Giraffe
(d) Shark

Ans: (d)
Explanation: The odd one out is "Shark" as it is a fish, while the other options are land animals.

Q4: Which of the following does not belong to the plant kingdom?
(a) Rose
(b) Mushroom
(c) Sunflower
(d) Grass

Ans: (b)
Explanation: The odd one out is "Mushroom" as it is a fungus, not a plant.

Q5: Choose the option that is not a type of bird:
(a) Eagle
(b) Sparrow
(c) Butterfly
(d) Crow

Ans: (c)
Explanation: The odd one out is "Butterfly" as it is an insect, not a bird.

Section B: Fill in the Blanks

Q1: In the classification of living organisms, the largest category is called _______.

Ans: Kingdom.
Explanation: The classification of living organisms involves arranging them into hierarchical groups based on their similarities and evolutionary relationships. The broadest and largest category is called the "Kingdom." Organisms within a kingdom share fundamental characteristics and represent a high level of diversity. There are currently five main kingdoms: Animalia (animals), Plantae (plants), Fungi, Protista (mostly unicellular eukaryotes), and Monera (mostly prokaryotic organisms).

Q2: Reptiles, birds, and mammals belong to the _______ group of animals.

Ans: Phylum Chordata
Explanation: The classification of animals involves various hierarchical levels, and one of the main categories is Phylum. Animals within a particular phylum share certain structural and developmental characteristics. Reptiles, birds, and mammals all belong to the phylum Chordata. The defining feature of this group is the presence of a notochord at some stage of their development, which is a flexible rod-like structure that provides support and forms the basis of the backbone (vertebral column) in vertebrate animals.

Q3: The process of classifying organisms based on their similarities and differences is called _______.

Ans: Taxonomy.
Explanation: Taxonomy is the science of identifying, naming, and categorizing living organisms into hierarchical groups based on their shared characteristics and evolutionary relationships. It aims to organize the vast diversity of life into a systematic and logical framework. Taxonomists use various methods, including morphology, genetics, behavior, and ecological traits, to determine the relationships among organisms and place them into appropriate taxonomic groups.

Q4: Animals that have a backbone are called _______.

Ans: Vertebrates.
Explanation: Vertebrates are a group of animals within the subphylum Vertebrata, which are characterized by having a well-developed internal skeleton made up of a vertebral column (backbone) that protects the spinal cord. Vertebrates include fish, amphibians, reptiles, birds, and mammals. This group represents a significant portion of the animal kingdom, and their shared characteristics distinguish them from invertebrates, which do not have a backbone.

Q5: The smallest category in the classification of organisms is known as _______.

Ans: Species.
Explanation: Species is the smallest and most specific category in the classification of living organisms. A species is a group of individuals that can interbreed and produce fertile offspring under natural conditions. It is the basic unit of biological classification and represents the most fundamental level of diversity among living organisms. Each species is given a unique two-part scientific name (binomial nomenclature) to identify and distinguish it from other species.

Section C: True or False

Q1: All animals can be classified into vertebrates and invertebrates.

Ans: True.
Explanation: Yes, all animals can be broadly classified into two main groups: vertebrates (animals with a backbone) and invertebrates (animals without a backbone).

Q2: Classification helps in organizing and studying a large number of organisms. 

Ans: True.
Explanation: Yes, classification is essential to organize and study the vast diversity of living organisms. It allows scientists to categorize and understand the relationships between different species, making it easier to study and communicate about them.

Q3: All plants produce flowers as part of their life cycle. 

Ans: False.
Explanation: Not all plants produce flowers. Plants are classified into two main groups: angiosperms (flowering plants) and gymnosperms (non-flowering plants). Gymnosperms, such as conifers, do not produce flowers.

Q4: Birds are warm-blooded animals.

Ans: True.
Explanation: Yes, birds are warm-blooded animals, which means they can maintain a relatively constant body temperature regardless of the external environment.

Q5: Humans belong to the animal kingdom. 

Ans: True.
Explanation: Yes, humans belong to the animal kingdom. The animal kingdom (Animalia) is one of the major biological kingdoms and includes multicellular, eukaryotic organisms that are heterotrophic (obtain food from other sources) and lack cell walls. Humans are part of the animal kingdom as well.

Section D: Match the Column

Ans: