Breathing in Animals

Q.

Breathing through the mouth is not recommended because mouth doesn't have any filter mechanism like nostrils to filter dust while breathing.

1. Statement I is True and Statement II is the correct explanation.

2. Statement I is True and Statement II is not the correct explanation.

Q. Aquatic animals like fish have __________ for respiration.

1. lungs
2. spiracle
3. trachea
4. gills

Q. During rainy season, animals living in the soil come out of their holes for __________.

1. excretion
2. respiration
3. digestion
4. reproduction

Q.

Describe an activity to show that air contains water vapours.

Q.

What do you observe when

A burning candle is covered with an inverted jar.

Q.

All living organisms need ____________ for respiration.

Q.

State whether the following statement is true or false.

Nitrogen as a nutrient element is highly immobile in plants.

1. True
2. False

Q.

Photosynthesis is important because it ____.

1. Synthesis food

2. Purifies atmosphere

3. Maintains a balance of gases in the atmosphere

4. All of these

Q.

State whether the following statements are true or false. If false, correct them.

(a) Plants consume oxygen for respiration.

(b) Plants produce oxygen during the process of making their own food.

(c) Air helps in the movements of sailing yachts and gliders but plays no role in the flight of birds and airplanes.

(d) Air does not occupy any space.

Q. Mountaineers carry cylinders filled with _____ gas as it is difficult to breathe at higher altitudes.

1. oxygen
2. nitrogen
3. hydrogen
4. carbon dioxide

Q.

Do not wear any ________clothes while handling fire.

Q.

Question 12.2

Make sentences using the given set of words.

Respiration, dissolved, animals, air, aquatic.

Q.

Organs that are used by fish for the exchange of gasses (O₂ and CO₂) in water?

Q.

State true or false.
Oxygen cycle maintains the air composition on Earth.

1. Hydrogen cycle

2. Oxygen cycle

Q.

Mist is a mass of fine water droplets in the atmosphere near or in contact with the earth.

1. True
2. False

Q.

They started playing and at the end of the game, all three of them were panting and breathing heavily. Sam noticed that John was breathing through his mouth so he advised him to breath through nose and not through mouth.

To this Kenneth said ' how does it matter? we will be inhaling the same air whether we breathe through nose or through mouth'.

Sam gave a reasonable explanation to make Kenneth and John understand that they should breathe through our nose and not through our mouth.

What was explanation given by Sam?

1. Breathing through mouth results in more consumption of oxygen and we should save oxygen.
2. Fine hair and mucus present inside the nose prevent carbon dioxide from getting into the respiratory system.
3. Fine hair and mucus present inside the nose prevent dust particles from getting into the respiratory system.
4. Breathing through nose results in less consumption of oxygen and we should save oxygen.

Q.

Dissolved ________in water is used by aquatic organisms used for respiration.

Q. To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Q.

An animal placed in an airtight transparent jar and is kept in sunlight, as shown in the figure.

How can the animal be helped to survive for a long time?

1. By placing another mouse in it

2. By placing a green plant in it

3. By removing all the air through a vacuum pump

4. By placing a burning candle in it

Q. During rainy season, animals living in the soil come out of their holes for

1. reproduction
2. excretion
3. respiration

Q.

Which of the following gases when decreased in the air increases the breathing rate?

1. Nitrogen

2. Oxygen

3. Carbon dioxide

4. Inert gases

Q. During rainy season, animals living in the soil come out of their holes for __________.

1. respiration
2. excretion
3. digestion
4. reproduction

Q. During rainy season, animals living in the soil come out of their holes for __________.

1. excretion
2. respiration
3. digestion
4. reproduction

Q. Plants prepare their own food by the process called .

1. respiration
2. breathing
3. photosynthesis
4. circulation

Q.

Statement I: Breathing through the mouth is not recommended.

Statement II: It is because mouth doesn't have any filter mechanism like nostrils to filter dust from the air while breathing.

1. Both statement I and statement II are true

2. Both statement I and statement II are false

3. Statement I is true and statement II is false.

4. Statement I is false and statement II is true.

Q.

Statement I: Mountaineers carry oxygen cylinders with them while climbing high mountains.

Statement II: The percentage of oxygen in air decrease with increasing altitude.

1. Statement I is true and statement II is the correct explanation

2. Both statements are false

3. Statement I is true and statement II is false

4. Statement I is false and statement II is true

Q.

The land of wind mills is

Q. Aquatic animals like fish have __________ for respiration.

1. lungs
2. spiracle
3. trachea
4. gills

Q.

Champo and Wampo are twin frogs. Champo lives on the ground whereas Wampo lives in the pond. Champo wonders how Wampo respires in water. He thinks Wampo carries an oxygen cylinder like scuba divers. On the other hand Wampo wonders how Champo survives on land. He thinks Champo carries an oxygen cylinder like the mountaineers. Do you think their assumption is right?

Q. Gas with the highest percentage in air is
(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) water vapour