Question

4. Explain the three pathways of breakdown of

glucose in living organis​

Answer 1

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Answer 2

$\huge\underline\bold\red{ANSWER}$

The three pathways of breakdown of glucose in organisms. They're as follows:

(i) Aerobic respiration

(ii) Anaerobic respiration

(iii) In Mitochondria

(i) Aerobic respiration:

The process of breaking down of food in the presence of oxygen to form energy is called as aerobic respiration.

The 6 - carbon molecule, glucose is broken down into a 3 - carbon molecule, pyruvate. This all happens in the presence of oxygen. They by - products are Carbon dioxide, Water and Energy.

(ii) Anaerobic respiration:

The process of breaking down of food in the absence of oxygen to form energy is called as anaerobic respiration.

During heavy exercise, our body needs more energy to continue our exercise. Here, the more oxygen is needed. But the oxygen taken by nose is insufficient. And there's no time to break down food in the presence of oxygen 'cause of lacking of oxygen.

So, the energy produced in mitochondria in the absence of oxygen produce lactic acid which causes muscle cramps.

The pyruvate is again broken down into Lactic acid which's also a three - carbon molecule.

(iii) In mitocondria:

The break down of pyruvate using oxygen takes place in mitochondria.

Pyruvate is broken down to give a three - carbon molecules of Carbon dioxide.

The energy formed during aerobic respiration is a lot greater than the energy produced in anaerobic respiration.