Question

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Answer 1

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1. What are the end products of aerobic respiration?

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$\implies$ The end products of aerobic respiration is $\sf {CO_2 }$ ( carbon dioxide ) , $\sf {O_2 }$ and energy.

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2. The cellular respiration takes place in which cell organelle?

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$\implies$ Cellular respiration takes place in Mitochondria.

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3. Name the end products of anaerobic respiration in yeasts.

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$\implies$ The end products of anaerobic respiration in yeasts are $\sf { C_2H_5OH }$ ( ethanol ) and $\sf {CO_2 }$ ( carbon dioxide ) .

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4. In some animals ,exchange of gases takes place through its thin and moist skin. Name one such animal.

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$\implies$ Earthworm.

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5. Give the name of respiratory organs in following animals:

Give the name of respiratory organs in following animals:a) Fish

Give the name of respiratory organs in following animals:a) Fishb) Human being

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$\implies$ a) Respiratory organ in fish is gills.

$\implies$ Respiratory organ in human being is lungs.

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6. Our nostrils has hair and mucous. What is the need of them in our nasal cavity?

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$\implies$ Both hair and mucous in our nostrils is needed in our nasal cavity because they help in removal of foreign particles.

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7. When oxygen enters our body it combines with haemoglobin to form a new substance. What is that new product?

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$\implies$ The new product is oxyhaemoglobin.

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8. Is the rate of breathing same for entire respiring organism?

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$\implies$ No, the rate of breathing same for entire respiring organism.

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9. Which gas present in air is essential for aerobic respiration? What is the role of this gas during respiration?

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$\implies$ Oxygen is the gas present in air is essential for aerobic respiration. Oxygen plays very important role in respiration. During aerobic respiration oxygen breaks down the glucose into carbon dioxide and water.

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10. On a very cold morning, Boojho and Paheli were talking with each other as they were walked down to their school. They observed that the air coming out of their mouth looked like smoke. They were assumed and wandered how it happened. Help them to find the answer.

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$\implies$ When we exhale (breathe out), our breath also contains moisture within CO2 .Because our mouth and lungs are moist, each breath we exhale contains a little bit of water in the form of water vapor.

and when you exhale and it's cold outside, though, the water vapor in your breath loses its energy quickly. Rather than continuing to move freely, the molecules begin to pack themselves closely together and makes the water vapour which we see smoke like substance. This happened to Boojho and Paheli.

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11. Sometimes we see that farmers loosen the soil. What is the reason behind it.

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$\implies$ The farmers loosen the soil because-:

• It helps in making the water and air holding capacity of the soil.
• The air then helps the roots to breathe, even though they penetrate deep into the soil.

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12.Various organs constitute the respiratory system of human. These organs are located according to their functions. Identify them.

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$\implies$ The organs in respiratory systems and their functions are-:

• Nostrils - Its allows air to enter in our body.
• Nasal cavity - It makes our nose moisturize, and filters the air entering the body before it reaches the lungs.
• Wind pipe or trachea - It allow the passage of air to pass the air into bronchi.
• Bronchi - Bronchus enters the lungs then divides into large number of small tubes called bronchioles.
• Lungs- They provide oxygen to capillaries and exhale carbon dioxide.

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Answer 2

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