A student prepared a test tube containing yeast, glucose, and water. After 24 hours, the test tube was analyzed for the presence of several substances. What substance would the student expect to find if respiration occurred in the test tube?

PHOTOSYNTHESIS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	a hormone
B	starch
C	nitrogen
D	carbon dioxide

Explanation:

Detailed explanation-1: -The test tube containing active yeasts produces carbon dioxide as the cells use the sugar as an energy source in respiration.

Detailed explanation-2: -Explanation: In the tube containing sugar solution and yeast, aerobic respiration will take place. So the products would be carbon dioxide and water. The tube which has a oil cover on the sugar solution, doesn’t have access to oxygen. So anaerobic respiration will take place.

Detailed explanation-3: -Lime water turns milky when CO 2 is mixed with it. Yeast, when added to the sugar solution or fruit juice that contains sugar, the yeast converts the sugar or glucose to produce ethyl alcohol and CO 2. The CO 2 produced turns the lime water milky.

Detailed explanation-4: -Mix yeast into a solution of glucose and water-this provides the glucose and oxygen needed for respiration. Leave at room temperature for 1 hour. Place mixture in a test tube. Place a boiling tube over the test tube and invert-the test tube will now be upside down.

There is 1 question to complete.

DENDROLOGY

TREE PHYSIOLOGY

PHOTOSYNTHESIS