Question

(A) A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.
(a) Why did the dough rise?
(b) Why did the dough smell sour?
(c) Why was sugar added to the dough?
(d) What would have happened if the dough was kept in the refrigerator, soon after it was prepared?
(B) Plants lack a specialised respiratory system. How do they carry out respiratory process? Explain.​

Answer 1

Answer:

A)

1. yeast ferments dough thus formation of CO₂, thats why it rises!

2. as it ferments, it gets sour smell!

3. sugar helps yeast fermenting!

4. it wont rise cuz reactivity of yeast will decrease!

B) Roots, stems, and leaves of plants exchange gases for respiration separately. As we all know, leaves have tiny pores called stomata, which is used for the exchange of gases. The oxygen, taken in through stomata is used by cells in the leaves to break down glucose into carbon dioxide and water. ( from brainly.in)

hope it helps <3