Gas Exchange in Animals

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Which of the following statements about stomata is true?

Stomata are only open during the daytime
Stomata allow the plant to release oxygen into the air
Stomata are openings on the upper epidermis of a leaf
Stomata are surrounded by guard and closing cells (correct)

What is the main function of guard cells?

To release oxygen into the air
To take in carbon dioxide for photosynthesis
To regulate the temperature of the leaf
To control the opening and closing of stomata (correct)

During the daytime, what happens to the guard cells?

They release oxygen into the air
They become swollen and full of water (correct)
They regulate the temperature of the leaf
They shrink and lose water

What happens to the guard cells at night?

They shrink and lose water (A) Signup and view all the answers

What is the main purpose of stomata in plants?

To take in carbon dioxide for photosynthesis (B) Signup and view all the answers

What is the color of the cobalt chloride paper after being exposed to exhaled air?

Pink (A) Signup and view all the answers

What is the temperature of inhaled air compared to exhaled air?

Inhaled air is higher in temperature (A) Signup and view all the answers

Which of the following is a key factor in gas exchange in plants?

The presence of stomata (C) Signup and view all the answers

What is the net gas exchange in plants during the daytime?

Net uptake of carbon dioxide and net release of oxygen (A) Signup and view all the answers

What happens to gas exchange in plants at night?

Net uptake of oxygen and net release of carbon dioxide (A) Signup and view all the answers

What is the purpose of using hydrogencarbonate indicator in Experiment 7.7?

To show any change in carbon dioxide content (D) Signup and view all the answers

What is the net release of carbon dioxide in plants?

Net uptake of oxygen and net release of carbon dioxide (D) Signup and view all the answers

What is the main source of food for plants?

Sunlight (D) Signup and view all the answers

What is the role of stomata in gas exchange in plants?

To allow gas exchange (C) Signup and view all the answers

Which gas is removed from our bodies through gas exchange during respiration?

Carbon dioxide (D) Signup and view all the answers

What is the purpose of setting up the boiling tube in Experiment 7.12?

To study the gas exchange in mealworms (C) Signup and view all the answers

What happens to the limewater in flask B and flask D when the vacuum pump is turned on in Checkpoint 7.6?

Limewater in flask B turns yellow and limewater in flask D turns pink (D) Signup and view all the answers

What is the purpose of the diaphragm in the human breathing system?

To draw air into the lungs (B) Signup and view all the answers

Where does gas exchange take place in the human breathing system?

Air sacs (A) Signup and view all the answers

What is the pathway of air flowing through the human breathing system?

Nasal cavity -> Trachea -> Bronchi -> Lungs (D) Signup and view all the answers

What is the texture of the pig's lungs observed in the experiment?

Soft (B) Signup and view all the answers

Which of the following is the primary function of gas exchange in humans?

To provide a continuous supply of oxygen to body cells (C) Signup and view all the answers

Where does gas exchange in humans take place?

In the air sacs inside the lungs (C) Signup and view all the answers

What is the purpose of gas exchange between the air sacs and the blood capillaries?

To allow oxygen to enter the blood and carbon dioxide to leave the blood (A) Signup and view all the answers

How large is the total surface area of our lungs?

About the size of a tennis court (A) Signup and view all the answers

In which lungs do you think gas exchange is more effective, frog's or human's?

Human's (C) Signup and view all the answers

How does smoking affect gas exchange in humans?

It decreases the effectiveness of gas exchange (D) Signup and view all the answers

What is the primary purpose of the vacuum pump in the smoking experiment with pig lungs?

To simulate the smoking process by the lungs (D) Signup and view all the answers

What is the purpose of observing the lung tissue carefully in the smoking experiment with pig lungs?

To determine if the lung tissue floats or sinks in water (D) Signup and view all the answers

What is the effect of smoking on the lungs of a pig, as shown in the smoking experiment?

The lung tissue sinks in water (C) Signup and view all the answers