Question

Why yeast are able to produce in sugar solution

Answer 1

Yeast can use oxygen to release the energy from sugar (like you can) in the process called "respiration". So, the more sugar there is, the more active the yeast will be and the faster its growth (up to a certain point - even yeast cannot grow in very strong sugar - such as honey).

Answer 2

Answer:

Yeast can convert glucose into $CO_2$

Explanation:

Yeasts have an inbuilt mechanism through which they can use glucose present in sugar solution to break it into their energy form and release $CO_2$.