Respiration — Practice

Question 1

We will find vocal cords in

Accepted Answer

Larynx

Question 2

Cluster of air sacs in lungs are called

Accepted Answer

Alveoli

Question 3

Which of the following is correct? (i) diaphragm contracts, volume of chest cavity increased (ii) diaphragm contracts, volume decreased (iii) diaphragm relaxes, volume increased (iv) diaphragm relaxes, volume decreased

Accepted Answer

(i) only

Question 4

Respiration is a catabolic process because of

Accepted Answer

Breakdown of complex food molecules

Question 5

The energy currency of the cell is ______, lenticels are respiratory structures on the ______ of a plant, and mangrove trees respire with their ______.

Accepted Answer

ATP, adenosine triphosphate; the stem; aerial roots, also called breathing roots

Question 6

Food sometimes enters the wind pipe and causes choking. How does it happen?

Accepted Answer

The epiglottis fails to close off the trachea in time, so food goes down the air passage instead of the food passage.

Question 7

Air leaves the tiny sacs in the lungs to pass into capillaries. What modification is needed in this statement?

Accepted Answer

Air as such does not leave the alveoli. Oxygen alone diffuses from the alveoli into the blood capillaries, while carbon dioxide diffuses the other way.

Question 8

Why does a deep sea diver and a mountaineer carry an oxygen cylinder on their back, and why does the rate of breathing increase while walking uphill in the mountains?

Accepted Answer

Because the oxygen available to haemoglobin is reduced at altitude, and the body compensates by breathing faster while also needing more oxygen for the extra muscular work.

Question 9

After vigorous exercise we feel pain in the muscles. What is the relationship between the pain and respiration?

Accepted Answer

The muscles run out of oxygen and switch to anaerobic respiration, producing lactic acid, whose accumulation causes the pain and whose removal requires the oxygen repaid afterwards.

Question 10

What procedure do you follow to understand anaerobic respiration in your school laboratory?

Accepted Answer

Boil and cool a glucose solution to drive off dissolved oxygen, add yeast, seal the surface with a one centimetre layer of liquid paraffin, and lead the gas produced into lime water while a thermometer records the temperature.

Practice — Respiration

Sign in to save attempts to your dashboard and track your accuracy over time

Find a verified tutor

Join a live course

Browse coaching centres

About

Categories

Support

Documentation

Get Study Tips & Updates

Download Our App

Download for iOS

Download for Android

Popular Cities