Question

Plant cells have mitochondria, which use glucose to produce ATP. Where does the glucose originate?

Answer 1

Plant produces glucose in the chloroplast through the process of photosynthesis. Calvin cycle is basically the biological process through which glucose is produced. The steps involved are as follows:

1. Absorbed CO2 is added to RuBP and 6C sugar is formed.

2. Breaking of 6C sugar into two  3-phosphoglycerate molecules

3. ATP gives phosphate group  to form 3-phosphoglycerate which is later on converted into 1,3-biphosphoglycerate.

4. Electons are required by 1,3-biphosphoglycerate to an aldehyde called glyceraldehyde-3-phosphate or G3P and these electrons are donated by NADPH

5. Enzyme aldolase uses two molecules of G3P to produce 6 C sugar called  fructose-1,6-biphosphate which is further converted to fructose-6-phosphate

6. Enzyme  isomerase converts fructose-6-phosphate to glucose-1-phosphate

Answer 2

Answer: The glucose in the plant originates from the cellular process known as photosynthesis.

Explanation:

The glucose in the plant cell originates from the process photosynthesis which takes place in the presence of sunlight and chlorophyll.

The carbon dioxide is combined with water in the leaves of the plant to get converted into glucose.

The light energy is converted into chemical energy. Oxygen is also released as a by-product of this process. The oxygen produced by the plants is also used for the conversion of glucose into ATP in mitochondria.