Question

give me solution I will mark you as brainliest ofclass 10th Chapter 6 intext question page number 105 ​

Answer 1

ans 1:    Since the amount of dissolved oxygen is fairly low compared to the amount of

oxygen in the air, the rate of breathing in aquatic organisms is much faster than

that seen in terrestrial organisms. Therefore, unlike aquatic animals, terrestrial

animals do not have to show various adaptations for better gaseous exchange.

ans 2 :   fig.6.8 of your book

ans 3:   Haemoglobin transports oxygen molecule to all the body cells for cellular

respiration. The haemoglobin pigment present in the blood gets attached to O2

molecules that are obtained from breathing. It thus forms oxyhaemoglobin and

the blood becomes oxygenated. This oxygenated blood is then distributed to all

the body cells by the heart. After giving away O2 to the body cells, blood takes

CO2 which is the end product of cellular respiration. Now the blood becomes de-

oxygenated.

Since haemoglobin pigment has less affinity for CO2, CO2 is mainly transported

in the dissolved form. This de-oxygenated blood gives CO2 to lung alveoli and

takes O2 in return.

ans 4:   The exchange of gases takes place between the blood capillaries that surround the

alveoli and the gases present in the alveoli. Thus, alveoli are the site for exchange

of gases. The lungs get filled up with air during the process of inhalation as ribs

are lifted up and diaphragm is flattened. The air that is rushed inside the lungs

fills the numerous alveoli present in the lungs. Each lung contains 300-350

million alveoli. These numerous alveoli increase the surface area for gaseous

exchange making the process of respiration more efficient.

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