CBSE Class 5 EVS Blow Hot Blow Cold Worksheet Set 02

Question 1. Draw a flow chart to show the process of respiration: -
Answer: Nose / Nostrils
    ↓
Nasal Passage / Nasal Cavity
    ↓
Windpipe (Trachea)
    ↓
Bronchi (Two small tubes)
    ↓
Lungs
    ↓
Alveoli (Air sacs where exchange of gases takes place)
In simple words: The flow chart traces the exact pathway of air as it enters our body during breathing until oxygen reaches the lungs.
Exam Tip: Use arrows pointing downwards to clearly show the sequence of organs involved in the respiratory system.

Question 2. Fill in the blanks: -
1. In the lungs, the exchange of oxygen and carbon dioxide takes place.
2. It is in the alveoli (air sacs) that the oxygen is taken in and replaced with carbon dioxide (Destination Point)
3. The windpipe is also known as trachea.
4. The nasal passage joins the nasal cavity / nose to the windpipe.
5. When we take air in through nostril it's called inhalation (inspiration).
Answer: 1. oxygen, carbon dioxide
2. alveoli
3. trachea
4. nasal cavity
5. inhalation
In simple words: These terms represent the key structures and actions involved in human breathing and gaseous exchange.
Exam Tip: Memorize scientific terms like trachea for windpipe and alveoli for air sacs as they frequently appear in exams.

Question 3. Solve the crossword puzzle
Clues
Across:
3 - muscular sheet below lungs
5 - windpipe divides in to two small tubes
7 - cover your mouth while doing this
8 - small opening in the nose
10 - short tube
11 - Breathing in

Down:
1 - gas given out
2 - bony structure that protects lungs
4 - gas needed for burning
6 - two air sacs
9 - breathing in
Answer:
Across Solutions:
3. DIAPHRAGM
5. BRONCHI
7. SNEEZE (or COUGH)
8. NOSTRIL
10. PHARYNX (or LARYNX)
11. INHALATION

Down Solutions:
1. CARBON DIOXIDE
2. RIB CAGE
4. OXYGEN
6. LUNGS
9. INHALE
In simple words: Crossword puzzles test your vocabulary related to the respiratory system by matching definitions to key scientific terms.
Exam Tip: Count the number of letter boxes in the crossword grid to verify if your guessed word fits correctly.