Question

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Q.1 what are the different ways in which glucose is oxidised to provide energy in various organisms?

Q.2 what advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?

Q.3 what is the role of theacid in our stomach?​

Answer 1

Answer:

1. ans. Aerobic respiration : In this case pyruvate is broken down into water and carbon dioxide along with release of energy. It commonly occurs in mitochondria of cells. 2) Anaerobic respiration in yeast : In yeast cells during fermentation pyruvate is converted into ethanol and C02 in the absence of 02.05

2. ans. Terrestrial organisms breathe by using atmospheric oxygen whereas aquatic organism takes oxygen dissolved in water. A terrestrial animal has over an aquatic animal with regard to obtaining oxygen for respiration. It's because the air in the atmosphere contains the maximum amount of oxygen.

3. ans. Role of HCl in stomach

It creates a medium of gastric juice acidic so that the enzyme pepsin digests the protein and kills the bacteria present in them. Hydrochloric acid helps your body to break down, digest, and absorb nutrients such as protein.

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Answer 2

Answer 1:

There are basically 3 different ways in which glucose oxidises to provide energy in various organisms. They are ::

• In the absence of oxygen (in yeast)

• During lack of oxygen (in muscle cells)

• Presence of oxygen (in mitochondria)

Answer 2:

Terrestrial animals have advantage in taking oxygen from surroundings as compared to the aquatic animals because oxygen dissolved in water in less as compared to the oxygen present in the atmosphere and we know that aquatic animals take oxygen dissolved in water whereas terrestrial animals take oxygen from atmosphere as a result rate of oxygen supply is more in the body of terrestrial animals as compared to aquatic animals.

Answer 3:

When the food reaches our stomach, gastric glands released HCl (hydrochloric acid), pepsin ( which is a protein digestive enzyme) and mucus. The HCl creates an acidic medium for pepsin to act upon the food to be digested. Pepsin can only act when it is provided an acidic medium ( which is provided by HCl in stomach) for the digestion of protein. Mucus which is also secreted by gastric glands, protects the inner lining of stomach from the effect of HCl.

More :-

End products formed in the breakdown of glucose by different pathways are :-

• Absence of oxygen : Ethanol + Carbon dioxide + Energy.

• Lack of oxygen : Lactic acid + Energy

• Presence of oxygen : Carbon dioxide + water + Energy