Respiration in Organisms Class 7 Extra Questions and Answers Science Chapter 10

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Class 7 Science Chapter 10 Extra Questions and Answers Respiration in Organisms

Extra Questions for Class 7 Science Chapter 10 Respiration in Organisms with Answers

Respiration in Organisms Class 7 Extra Questions Very Short Answer Type

Question 1.
Where does cellular respiration take place?
Answer:
It takes place in the cells of organisms.

Question 2.
Write the equation for breakdown of food in aerobic respiration.
Answer:

Question 3.
Write the equation for breakdown of food in anaerobic respiration.
Answer:

Question 4.
What is a breath?
Answer:
A breath means one inhalation plus one exhalation.

Question 5.
What is the breathing rate of an average person at rest?
Answer:
On an average, an adult human being at rest breathes in and out 15-18 times in a minute.

Question 6.
How do ribs and diaphragm move during inhalation?
Answer:
During inhalation, ribs move up and outwards and diaphragm moves downwards.

Question 7.
What care should be taken during sneezing?
Answer:
When one sneezes, he/she should cover his/her nose so that the foreign particles expelled out are not inhaled by other persons.

Question 8.
Which is the respiratory organ for earthworm?
Answer:
Skin.

Question 9.
What is exhalation?
Answer:
Giving out of air rich in carbon dioxide is called exhalation.

Respiration in Organisms Class 7 Extra Questions Short Answer Type 1

Question 1.
What are anaerobes? Give example.
Answer:
There are some organisms such as yeast that can survive in the absence of air. They are called anaerobes.

Question 2.
What is yeast? What is their use?
Answer:
Yeasts are single-celled organisms. They respire anaerobically and during this process yield alcohol. They are, therefore, used to make wine and beer.

Question 3.
Why do you get muscle cramps after heavy exercise?
Answer:
The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps.

Question 4.
Show the composition of inhaled and exhaled air.
Answer:
The percentage of oxygen and carbon dioxide inhaled and exhaled air:

Respiration in Organisms Class 7 Extra Questions Short Answer Type 2

Question 1.
How does anaerobic respiration occur in humans?
Answer:
During heavy exercise, fast running, cycling, walking for many hours or heavy weight lifting, the demand for energy is high. But the supply of oxygen to produce energy is limited. Then anaerobic respiration takes place in the muscle cells to fulfil the demand of energy:

Question 2.
Describe respiration in earthworm.
Answer:
Earthworms breathe through their skins. The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them.

Respiration in Organisms Class 7 Extra Questions Long Answer Type

Question 1.
Give a brief description of our respiratory system with diagram.
Answer:
Normally we take in air through our nostrils. When we inhale air, it passes through our nostrils into the nasal cavity. From the nasal cavity, the air reaches our lungs through the windpipe. Lungs are present in the chest cavity.

This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm forms the floor of the chest cavity.

Question 2.
Draw diagrams to show movements of rib and diaphragm during breathing.
Answer:

Question 3.
Describe respiration in cockroach.
Answer:
A cockroach has small openings on the sides of its body. These openings are called spiracles. Internally, they have a network of air tubes called tracheae for gas exchange rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body. Similarly, carbon dioxide from the cells goes into the tracheal tubes and moves out through spiracles.

Question 4.
How does breathing take place?
Answer:
Breathing involves the movement of the diaphragm and the rib cage. During inhalation, ribs move up and outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs.

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