CBSE Class 7 Science Respiration In Animals Worksheet

Very Short Answer Type Questions

Question. Do all cells use oxygen to produce energy ?
Answer : No

Question. Name one substance which is produced in anaerobic respiration by an organism but not in aerobic respiration.
Answer : Ethanol

Question. Name one organism which can live without oxygen.
Answer : Obligate anaerobes like Peptostreptococcus, Treponema, Fusiform, Porphyromonas, Veillonella and Actinomyces can live without oxygen.

Question. In which type of respiration, aerobic or anaerobic, more energy is released ?
Answer : Aerobic respiration

Question. Name the substance whose build up in the muscles during vigorous physical exercise may cause cramps.
Answer : Lactic acid

Question. Where in the lungs does gas exchange take place ?
Answer : alveoli

Question. What is the name of tiny air-sacs at the end of smallest bronchioles in the lungs ?
Answer : At the end of the bronchiole are tiny branches called Alveolar Ducts which end in clusters of sacs called Alveoli.

Question. What is the other name of wind-pipe ?
Answer : trachea

Question. What organs are attached to the two bronchi ?
Answer : Bronchi: It is the part of the respiratory system, which is lead from the trachea to the lungs and its function is to carry air to the lungs through its tubular branches.
Organs attached to the two bronchi:
Lungs are the organs that are attached to the two bronchi, which are part of the respiratory system.
Each bronchiole ends in a number of very thin, irregular walled microscopic air sacs known as alveoli.
The atmospheric air is transported through the tubular branches of bronchi from the nostrils to the alveoli in the lungs.
Alveoli is the site where the exchange of oxygen and carbon dioxide takes place.

Question. Which part of roots is involved in the exchange of respiratory gases ?
Answer : Root hair

Question. Name the process by which plant parts like roots, stems, and leaves get oxygen required for respiration.
Answer : Diffusion

Question. Name the pores in a leaf through which respiratory exchange of gases takes place.
Answer : Stomata

Question. Name the areas in a woody stem through which respiratory exchange of gases takes place.
Answer : Lenticels

Question. What is the name of the extensions of the epidermal cells of a root which help in respiration ?
Answer : Root hair

Question. Out of photosynthesis and respiration in plants, which process occurs :
(a) all the time ?
(b) only at daytime ?
Answer : (a) Respiration (b) Photosynthesis

Question. Name the organs of breathing in fish.
Answer : gills

Question. Name an animal which absorbs oxygen through its moist skin.
Answer : Specific species, such as the lungless salamanders, lack the primitive lungs that other amphibians have and breathe exclusively through their skin. Amphibians like frogs also absorb water through their skin and do not need to drink.

Question. Name an animal which depends on simple diffusion of gases for breathing.
Answer : Amoeba

Question. Name two animals which breathe through gills.
Answer : Gills:
The gills are the respiratory organs.
It assists the aquatic organisms in breathing underwater.
These organs are composed of proteins.
They have a thread-like structure.
They aid in the exchange of various ions, and gases.
Gills are used for breathing by animals such as fish and prawns.

Question. The trachea divides into two tubes at its lower end. What is the name of these tubes ?
Answer : The trachea divides into two primary bronchi, the left bronchus and right bronchus which in turn divides into bronchioles (primary and then secondary and then tertiary) which end into sac-like structures called alveoli.

Question. Where does the blood absorb oxygen in the human body ?
Answer : Alveoli in lungs

Question. Name the red pigment which carries oxygen in blood.
Answer : The red pigment which carries oxygen in the blood is haemoglobin.

Question. Which gases are exchanged in your lungs ?
Answer : During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Question. In the lungs :
(a) what substance is taken into the body ?
(b) what substance is removed from the body ?
Answer : (a) Oxygen (b) Carbon dioxide

Question. State whether the following statements are true or false :
(a) During respiration, the plants take CO2 and release O2.
(b) Energy can be produced in cells without oxygen.
(c) Fish and earthworm exchange gases during respiration in the same way.
Answer : (a) False (b )True (c) False

VERY SHORT ANSWER TYPE QUESTIONS

Q1. What is released during respiration?

Q2. What do we get as products after breaking down of glucose in the absence of oxygen?

Q3. How many times does and adult human being breathe in and out while at rest?

Q4. How does the skin of an earthworm feel on touching?

Q5. How can yeast survive in the absence of air?

SHORT ANSWER TYPE QUESTIONS

Q1. Why does cell need energy?

Q2. Why do all living organisms need to respire?

Q3. What happens to ribs and diaphragm during exhalation in breathing?

Q4. How are muscle cramps caused?

Q5. How is lactic acid produced in muscles?

Q6. What do you mean by breathing rate?

Q7. How do ribs and diaphragm move during inhalation?

Q8. Why should we cover our nose while sneezing?

Q9. How does frog breathe?

Q10. How does oxygen in the air help in the breaking down of food?

Q11. Why are yeasts used for making wine and beer?

Q12. What is the difference between exhalation and inhalation?

Q13. Why does an athlete breathe faster and deeper than usual after finishing the race?

Q14. Why do root cells absorb air from the soil?

Q15. Why can our muscle cells respire anaerobically for short time?

Q16. Explain the process of breathing in fish.

Q17. What is the utility of diaphragm in respiration in human beings?

Q18. Why do we feel hungry after physical exercises?

LONG ANSWER TYPE QUESTIONS

Q1. Explain the mechanism of breathing in human beings.

Q2. Write four differences between breathing and respiration.

Q3. Draw a well labeled diagram of human respiratory system.

Q4. List the similarities and differences between aerobic and anaerobic respiration.

Q5. Describe the process of breathing in earthworms.