Question

A food stall owner was preparing a dough for making bhaturas. He added a pinch of yeast and
sugar to the dough and left it in a warm place. After a few hours, the dough had risen. There was
a sour smell too.
(i) Why did the dough rise?
(ii) Why did the dough smell sour?
(iii) What is the type of respiration found in yeast? Does it happen in humans? If yes, when and where does it happen?

Answer 1

Explanation:

Let one side be xcm.Since the difference between the two sides is 7cm

∴ the other side=x+7cm

As the given triangle is a right angled triangle with hypotenuse =17cm

By using pythagoras theorem, we get

x

2

+(x+7)

2

=17

2

⇒x

2

+x

2

+14x+49−289=0

⇒2x

2

+14x−240=0

⇒x

2

+7x−120=0

⇒x

2

+15x−8x−120=0

⇒x(x+15)−8(x+15)=0

⇒(x+15)(x−8)=0

⇒x=−15 or x=8

x=−15 cannot be negative

∴x=8

Hence the two sides of the triangle are 8cm and 15cm.

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Answer 2

Answer:

Explanation:

The C02 released during respiration by the yeast results in the rise of dough.

During anaerobic respiration, yeast produces alcohol resulting in sour smell.

Sugar acts as food for yeast.

At low temperatures, yeasts will not multiply and respire because of which the dough will not rise or become sour.