Q. 775.0( 2 Votes )

Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test-tube is closed with a cork and allowed to stand for some time. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick.

(a) What could be (i) X, (ii) Y, and (iii) Z ?

(b) What is the process of converting sugar into substance Y by the action of X known as? (c) What type of respiration is exhibited by X in the above process ?

Answer :

(a) (i) Yeast (ii) Ethanol (iii) Carbon dioxide

(b) Fermentation is the process by which sugar converts into ethanol by the action of Yeast.


(c) Fermentation is an example of anaerobic respiration which is done by yeast (X) in the above experiment.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Get to Know How Do We Respire?42 mins
Genius Quiz | The Vital Processes38 mins
Quiz | Let's Recall - Life Process50 mins
Get to Know About Waste EliminationFREE Class
Know More About Transport in animals47 mins
Defining Life and Life Processes57 mins
Champ Quiz | Examining the Life Processes43 mins
Doubt Session - Life Processes46 mins
Working of Heart49 mins
Champ Quiz | Double Circulation33 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses