Class 7 Ch - 10 Respiration in Organisms

Yeast is used in wine and beer industries because it respires

• aerobically producing oxygen

• anaerobically producing alcohol

• anaerobically producing CO₂

• aerobically producing alcohol

During the process of exhalation, the ribs move

• down and outwards

• down and inwards

• up and outward

• up and inwards

Breathing is a process that

(i) provides O₂ to the body.

(ii) breaks down food to release energy.

(iii) helps the body to get rid of CO₂

(iv) produces water in the cells.

Which of the following gives the correct combination of functions of breathing?

• (i) and (ii)

• (i) and (iii)

• (ii) and (iii)

• (ii) and (iv)

Which are the gases involved in breathing?

• O₂ and O₃

• O₂ and SO₂

• O₂ and NO₂

• O₂ and CO₂

Name the organ of the body in which the blood is oxygenated.

• Lungs

• Pancreas

• Heart

• Lever

After heavy exercise, due to the accumulation of which substance we get muscle cramps ?

• Lactic acid

• Lipoic acid

• Malaic acid

• Fumaric acid

Yeasts are used in

• wine and beer industry

• bakery

• in both

• none of these

In the following figure of respiratory system organs labelled by 1 and 2 are respectively:

• Lungs, Nasal cavity

• Tracheae, Lungs

• Lungs, Tracheae

• Nasal cavity, Lungs

Breathing rate in human beings in normal condition is

• 12-15 times in a minute

• 15-18 times in a minute

• 18-22 times in a minute

• 22-25 times in a minute

Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

• alcohol and lactic acid

• alcohol and CO₂

• lactic acid and CO₂

• lactic acid only