Mechanism of Breathing

Q.

The correct sequence of air passage during inhalation?

Nostrils→pharynx→larynx→trachea→alveoli

False

True

Q.

Which is the correct sequence of air passage during inhalation?

1. Nostrils→ larynx→ pharynx→ trachea→ lungs.

2. Nasal passage→ trachea→ pharynx→ larynx→ alveoli

3. Larynx→ nostrils→ pharynx→ lungs

4. Nostrils→ pharynx → larynx→ trachea→ alveoli.

Q. Describe the changes that take place (I) around the rib cage (ii) diaphragm (iii) chest cavity, during inspiration. State the effect of these changes

Q. Complete the equation of anaerobic respiration in plants.
$C_6{H}_{12}{O}_6⟶$

1. $C{H}_{3}COOH+C{O}_2+38ATP$
2. $LacticAcid+38ATP$
3. $2C_2{H}_{5}OH+2C{O}_2+2ATP$
4. $6C{O}_2+6H_{2}O+2ATP$

Q.

Catabolic processes ___ .

1. occur only in autotrophs

2. occur only in heterotrophs

3. break complex molecules into simpler ones

4. make complex molecules from simpler ones

Q.

Starting from the nostrils, trace the path in sequence which the transpired air takes until it reaches the air sacs.

Q. Complete the pathway of inhaled air through the respiratory system.
A. Nostrils → B. Nasal cavity → C. → D. Trachea → E.

Q. State the differences between breathing and respiration.​

Q. Lungs lie in the thoracic cavity separated by ............ from the abdominal cavity.

1. Septum
2. Diaphragm
3. Thoracic cage
4. Ribs

Q. What are the functions of ribs and diaphragm? ​

Q. Write one suitable word for the following sentences.
A. The air tubes of insects
B. Tiny pores on the surface of leaf
C. An anaerobic organism

Q. ​Choose the correct pathway of inhaled air through the respiratory system.​

​

1. $Lungs\to Trachea\to Pharynx\to Nostrils$
2. $Nostrils\to Lungs\to Pharynx\to Trachea$
3. $Nostrils\to Pharynx\to Trachea\to Lungs$
4. $Lungs\to Pharynx\to Trachea\to Nostrils$

Q. Which of the following are necessary for the process of breathing in man?

1. Contraction of diaphragm
2. Contraction-relaxation of heart
3. Relaxation of ribs muscle
4. Both A and C

Q. Complete the pathway of inhaled air through the respiratory system.
A. Nostrils → B. Nasal cavity → C.___________ → D. Trachea → E. _____________

Q. Expiration invloves

1. Relaxation of diaphragm and intercostal muscles
2. Contraction of diaphragm and intercostal muscles
3. Contraction of diaphragm muscles
4. Contraction of intercostal muscles