CBSE Class 5 EVS Revision Worksheet Set 04

Q1 Choose the correct option:-

Question 1. The beginning of language and expression is:
(a) crying
(b) laughing
(c) shouting
Answer: (a) crying
A baby communicates its needs, hunger, or discomfort primarily through crying, which serves as the earliest form of expression.
In simple words: A baby starts expressing itself by crying.

Exam Tip: Remember that before learning words, infants use crying as their basic communication tool.

Question 2. A great lady with disabilities who devoted her life to other disabled people:
(a) Hellen D'souza
(b) Hellen Keller
(c) Hellen Marsh
Answer: (b) Hellen Keller
Hellen Keller was deaf and blind, and she dedicated her entire life to advocating for and inspiring people with disabilities worldwide.
In simple words: Hellen Keller overcame her own disabilities to help others.

Exam Tip: Hellen Keller is a universally known figure for inspiring individuals with visual and hearing impairments.

Question 3. The Indian acrobats who perform in villages, towns and cities:
(a) Gymnasts
(b) Acrobats
(c) Nats
Answer: (c) Nats
Nats are a traditional community of street acrobats and performers in India who showcase their skills in public spaces.
In simple words: Traditional Indian street acrobats are known as Nats.

Exam Tip: Associate the traditional community name "Nats" with street acrobatics and performances in India.

Question 4. While breathing in, our lungs:
(a) expand
(b) contract
(c) both
Answer: (a) expand
When we inhale, air rushes into the lungs, causing them to expand and fill with oxygen.
In simple words: Lungs get bigger or expand when we take in air.

Exam Tip: Inhalation = expansion of chest and lungs; Exhalation = contraction.

Question 5. The insects use special organs to find their way:
(a) antennae
(b) abdomen
(c) legs
Answer: (a) antennae
Insects use their antennae (feelers) to sense smells, vibrations, and surroundings to navigate.
In simple words: Insects use their feelers or antennae to find directions.

Exam Tip: Antennae act as sensory organs for insects to detect smells and movement.

Q2 Fill in the blanks:

Question 1. _________ use Earth's magnetic field to find their way around.
Answer: Migratory birds
Many species of migratory birds use the Earth's magnetic field as a natural compass during long-distance journeys.
In simple words: Birds use Earth's magnetism to navigate during migration.

Exam Tip: Mention "Migratory birds" or "Sea turtles" as organisms that sense magnetic fields.

Question 2. Insects, wolves, dears and skunks release chemicals called _________ to communicate with each other.
Answer: pheromones
Pheromones are chemical signals released by animals that trigger social responses and communication among members of the same species.
In simple words: Animals use scented chemicals called pheromones to send messages.

Exam Tip: Learn the spelling and definition of pheromones for animal communication questions.

Question 3. All wrestler worship _________.
Answer: Lord Hanuman
Traditional Indian wrestlers traditionally pay homage and worship Lord Hanuman as a symbol of strength, discipline, and power.
In simple words: Wrestlers look up to and worship Lord Hanuman for strength.

Exam Tip: Lord Hanuman represents ultimate physical and mental strength in traditional Indian wrestling culture.

Question 4. During winter our _________ is warmer than the air outside.
Answer: breath
The air inside our lungs and body is at body temperature, which is significantly warmer than cold winter air outdoors.
In simple words: The air we breathe out is warm compared to cold winter air.

Question 5. Eating habits are greatly influenced by _________.
Answer: culture, region, and availability of food
What people eat depends heavily on local agricultural production, climatic conditions, traditions, and cultural backgrounds.
In simple words: Our food choices depend on where we live and our traditions.

Exam Tip: Geographical location and cultural background are key factors in determining dietary habits.

Q3 Give one word for the following:

Question 1. Lacking the ability to speak.
Answer: Dumb (or Mute / Speech-impaired)
An individual who cannot produce spoken language is referred to as mute or speech-impaired.
In simple words: Someone who cannot speak is called mute or dumb.

Exam Tip: Use respectful modern terminology like "speech-impaired" alongside traditional terms when appropriate.

Question 2. State where snake boat race is held.
Answer: Kerala
Snake boat races (Vallam Kali) are a famous traditional cultural and sporting event held in the backwaters of Kerala during Onam.
In simple words: Kerala is famous for its traditional snake boat races.

Exam Tip: Connect "snake boat race" instantly with the state of Kerala and the festival of Onam.

Question 3. The gas which helps us to digest our food.
Answer: Oxygen
Oxygen is essential for cellular respiration, breaking down digested food molecules to release energy for bodily functions.
In simple words: Oxygen helps break down food to release energy in our body.

Exam Tip: Do not confuse digestive juices with the gas required for energy release (oxygen).

Question 4. The part of butterfly which helps us to suck nectar.
Answer: Proboscis
Butterflies possess a long, tubular, flexible mouthpart called a proboscis, which acts like a straw to suck nectar from flowers.
In simple words: A butterfly uses its straw-like mouth called a proboscis to drink nectar.

Exam Tip: Learn the spelling and exact function of "proboscis" for insect-related questions.

Question 5. An animal which uses a range of sounds to indicate different messages.
Answer: Dolphin (or Whale / Bird / Monkey)
Dolphins emit a complex variety of clicks, whistles, and squeaks to communicate specific messages and coordinate with each other.
In simple words: Dolphins use different sounds to talk to each other.

Exam Tip: Marine mammals like dolphins and whales are well known for complex acoustic communication.

Q4 Write True or False for the following statements:-

Question 1. The sense of hearing helps bats to fly.
Answer: True
Bats use echolocation, emitting high-pitched sounds and listening to the returning echoes to navigate and fly in complete darkness.
In simple words: Bats use sound echoes to fly and find obstacles in the dark.

Exam Tip: Remember that bats rely primarily on hearing (echolocation) rather than vision for flight navigation.

Question 2. Elephants show affection by entwining their trunk.
Answer: True
Elephants use their trunks to touch, greet, and entwine with one another as a sign of affection, bonding, and reassurance.
In simple words: Elephants wrap their trunks together to show love and friendship.

Exam Tip: Elephant trunk entwining is a classic behavioral example of social bonding.

Question 3. Kalaripayattu is an archery camp.
Answer: False
Kalaripayattu is an ancient traditional martial art form originating from Kerala, not specifically an archery camp.
In simple words: Kalaripayattu is a traditional martial art, not archery.

Question 4. Our windpipe is also called the diaphragm.
Answer: False
The windpipe is scientifically called the trachea, while the diaphragm is the dome-shaped muscle located below the lungs.
In simple words: The windpipe is the trachea, not the diaphragm.

Exam Tip: Do not confuse the respiratory tube (trachea) with the breathing muscle (diaphragm).

Question 5. A part of an organism having a vital function is called fibre.
Answer: False
A distinct part of an organism that performs a specific vital function is called an organ, not fibre.
In simple words: Body parts that do important jobs are called organs.
Exam Tip: Distinguish between organs (functional body parts) and fibers (thread-like structures).

Q5 Correct the incorrect statement:

Question 1. Animals which feed on other dead animals, plant material and waste are called carnivores.
Answer: Animals which feed on dead animals, plant material and waste are called scavengers (or omnivores/detritivores).
Carnivores hunt and feed exclusively on the flesh of living animals.
In simple words: Animals that clean up dead remains are scavengers, not carnivores.

Exam Tip: Scavengers help keep the environment clean by consuming dead matter.

Question 2. The puffer fish can puff up to four times its size. By swallowing water.
Answer: The puffer fish can puff up to several times its size by swallowing water rapidly.
The original sentence had a punctuation error with a full stop splitting the sentence improperly.
In simple words: Puffer fish swallow water quickly to swell up and scare predators.

Exam Tip: Watch out for punctuation errors in scientific statements during correction exercises.

Question 3. We take deep breaths when or heart beats faster to take in more carbon dioxide.
Answer: We take deep breaths when our heart beats faster to take in more oxygen.
During physical exertion, the body requires more oxygen for energy production, not carbon dioxide.
In simple words: We breathe heavily to take in more oxygen, which our body needs.

Exam Tip: Remember that living beings inhale oxygen and exhale carbon dioxide.

Question 4. Escalators help people on wheel chairs to enter a building.
Answer: Ramps (or elevators/lifts) help people on wheelchairs to enter a building.
Escalators are moving stairs and are unsafe and unsuitable for wheelchair users.
In simple words: Ramps help wheelchair users enter buildings easily.

Exam Tip: Ramps are a crucial accessibility feature for differently abled individuals using wheelchairs.

Question 5. Boxers in India were trained in akharas traditionally.
Answer: Wrestlers in India were trained in akharas traditionally.
Akharas are traditional training schools specifically meant for Indian traditional wrestling (kushti).
In simple words: Traditional wrestling (kushti) takes place in akharas, not boxing.

Exam Tip: Associate "akharas" with traditional Indian wrestling rather than modern combat sports like boxing.

Q6 Complete the following:

Question 1. Breathing involves _________.
Answer: inhalation (taking in oxygen-rich air) and exhalation (giving out carbon dioxide-rich air)
Breathing is the physical process of taking air into the lungs and pushing it out.
In simple words: Breathing means taking air in and pushing air out.

Exam Tip: Clearly mention both inhalation and exhalation when defining breathing.

Question 2. Whales and dolphins communicate _________.
Answer: through a series of clicks, whistles, and low-frequency songs traveling through water
Marine mammals use specialized vocalizations to transmit information across vast distances underwater.
In simple words: Whales and dolphins talk to each other using clicking sounds and songs underwater.

Question 3. Sniffer dogs are used by _________.
Answer: police, military, and rescue teams to detect explosives, drugs, or missing people
Because of their extraordinary sense of smell, dogs are deployed in security and rescue operations.
In simple words: Police use sniffer dogs with powerful noses to find hidden items or criminals.

Exam Tip: Highlight the exceptional olfactory sense of dogs in security applications.

Question 4. Differently abled people may have _________.
Answer: physical, sensory, intellectual, or developmental impairments that affect daily activities
Differently abled individuals experience varying degrees of challenges in mobility, vision, hearing, or learning.
In simple words: Differently abled people may have physical or sensory challenges.

Exam Tip: Always use respectful and inclusive language when discussing differently abled individuals.

Question 5. We blow on sparks in firewoods because _________.
Answer: it supplies a fresh and steady stream of oxygen, which fans the flames and helps the fire burn brighter
Blowing increases the oxygen supply around glowing embers, causing them to reignite.
In simple words: Blowing adds more oxygen to the embers, making the fire grow bigger.

Question 1. How do cats and golden hamsters communicate?
Answer: Cats communicate through purring, meowing, hissing, body posture, and tail movements. Golden hamsters communicate primarily through scent marking using specialized scent glands, as well as squeaks and body language.
Different species use unique combinations of vocal sounds, gestures, and chemical signals.
In simple words: Cats use sounds and body posture, while hamsters use scents and squeaks to communicate.

Exam Tip: Contrast vocal/visual communication in cats with scent-based communication in hamsters.

Question 2. Why does our chest expands and contracts while breathing?
Answer: Our chest expands when we inhale because air fills our lungs and the diaphragm moves downward. It contracts when we exhale as air is pushed out and the diaphragm relaxes upward.
This mechanical movement changes the volume of the chest cavity to draw air in and push it out.
In simple words: The chest moves out when air fills the lungs and moves in when air goes out.

Question 3. How does a baby expresses his/her feelings? Environmental sensitivity (Value based)
Answer: A baby expresses feelings through crying when uncomfortable or hungry, smiling or laughing when happy, cooing when content, and using facial expressions or gestures. Being sensitive to these cues helps caregivers understand and respond to the baby's needs lovingly.
Infants rely completely on non-verbal emotional expressions.
In simple words: Babies cry when upset and smile when happy to show their feelings.

Question 4. How can we help the differently abled people?
Answer: We can help differently abled people by being respectful, offering assistance when needed, ensuring accessible infrastructure like ramps and braille signage, treating them with equality, and encouraging their participation in normal social activities.
Creating an inclusive and supportive environment empowers differently abled individuals.
In simple words: We can help them by being kind, offering help, and making public spaces accessible.

Question 8. Draw a labeled diagram of a process that digests food and provides energy to our body?
Answer: The process of digestion breaks down food in organs like the mouth, stomach, and small intestine, while the respiratory and circulatory systems supply oxygen to convert digested nutrients into energy.
In simple words: Food is digested in the digestive system and combined with oxygen to give us energy.

Exam Tip: Ensure all primary organs (mouth, food pipe, stomach, small intestine) are clearly labeled in biological diagrams.