Kerala SCERT Class 9 Biology Breathing for Energy Question Answer
Kerala SCERT Class 9 Biology Chapter 4 Breathing for Energy Question Answer Solution Here. Kerala Board Class 9 Students can find Here 4th Chapter Breathing for Energy Notes provide by our Teacher. Important Question Answer from Chapter 4 Breathing for Energy.
- Board- Kerala Board.
- Class – 9.
- Subject – Biology Part 1
- Chapter – 4
- Chapter Name – Breathing for Energy.
- Topic – Question Answer Solution.
More Notes by Expert Teacher:
1.) Define inspiration and expiration. Describe the changes taking place in parts of respiratory organ during this process?
Air enters the lungs and increases the size of the thoracic cavity. This process is known as inspiration. When air is expelled out of the lung it leads to contraction of the thoracic cavity known as expiration.
During inspiration the ribs rise due to contraction of muscles, diaphragm contracts during expiration ribs lower due to relaxation of muscles, diaphragm relaxes.
2.) Draw a labeled diagram of an alveolus and briefly explain about the oxygen and carbon dioxide diffusion in it.
The capillaries surround the alveoli, the surface that separates the blood in the blood capillaries and the air in the alveoli, has the thickness of two rows cells.
During inspiration the concentration of oxygen is higher than carbon dioxide in alveoli and in capillaries the concentration of carbon dioxide is higher than oxygen, hence the oxygen from the alveoli diffuses in capillaries and carbon dioxide from the capillaries diffuse in alveoli.
3.) What are red blood cells that explain the importance of carrying oxygen?
Red blood cells are disc shaped and do not have nucleus or any other organelles. They have hemoglobin which has an affinity to oxygen. The structure consists of four protein strands with iron containing Heam, oxygen combines with iron in the Heam hence each hemoglobin molecule can carry four oxygen molecules.
4.) Assertion and reasoning
Assertion: – the main constituent for the synthesis of hemoglobin is iron
Reason1: – food items like leafy vegetables do not contain iron.
Reason2: – food items like leafy vegetables with iron content should content should be included in diet
Options
a·) Both reasons are true for assertion
b·) Reason 2 is correct for assertion
c·) Assertion is wrong hence reasons are wrong
d·) Assertion 1 is correct for assertion
Option: – reason 2 is correct for assertion
5.) The process by which energy is released is called cellular respiration. Explain the two processes?
Glycolysis is the first phase of cellular respiration occurs in cytoplasm glucose is converted to pyruvate and 2 ATP are produced
The Krebs cycle is the second phase of cellular respiration that occurs in mitochondria pyruvic acid is converted to carbon dioxide and water 28 ATP molecules are produced.
6) Case base question
For a science project student were told to write names of some products that undergo fermentation and explain the organism involved if any Savita wrote about idli and curd.
- a) Write the organism involved and the product of respiration in idli
- b) Write the organism involved and product of respiration in curd
- c) What kind of respiration takes place in fermentation
- d) Write any two other product name that are from fermentation
Yeast is involved in idli and produces alcohol and Co2
Bacteria is involved in curd making and product is lactic acid
Anerobic respiration is involved in fermentation
Two products out of fermentation are cake and wine
7) Tabacco is hazardous for health, explain any two kinds of ill effects of smoking?
The respiratory disorders associated with tobacco are lung cancer carcinogen present in tobacco which causes lung cancer. Bronchitis is caused due to tar, carbon monoxide leads to deposition of mucus, swelling of lungs.
8) Write about the effect of smoking on alveoli and bronchioles?
Alveoli ruptures due to loss of elasticity, by the deposition of toxic substance. This reduces the surface area vital capacity of respiration.
Bronchitis is associated with bronchioles which leads to deposition of mucus and swelling of lungs.
Also See: This Chapter MCQ Question and Answer