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Partial pressure

A) Mangrove plants

Dead space is the air that is not involved in gaseous exchange.

The average breathing rate in an adult man at rest is about 15 to 18 times per minute.

The amount of dissolved oxygen is very low in water compared to the amount of oxygen in the air. Hence the rate of breathing in aquatic animals is faster than the terrestrial animals.

The part of roots that are involved in the exchange of respiratory gases are root hairs.

1. The amount of oxygen dissolved in water is low when compared to the amount of oxygen present in air. 

2. Therefore the rate of breathing in aquatic animals is much faster than in terrestrial animals.

1. Accumulation of lactic acid results in muscular pain. 

2. During 100 m race a well trained athlete can hold his breath and afterwards he pants. 

3. In this case, the muscles are using energy released during the anaerobic break down of glucose, lactic acid is produced. 

4. The presence of lactic acid in the blood is the main cause of muscle fatigue. Whether it is 100 mtr race or 5 km race. 

5. If the body is rested long enough the tiredness goes.

ATP is a nucleotide consisting of a base- adenine, a pentose sugar – ribose and three phosphate groups. Out of three phosphate groups the last two are attached by high energy rich bonds. On hydrolysis, it releases energy (7.3 K cal or 30.6 KJ / ATP) and it is found in all living cells and hence it is called universal energy currency of the cell.

The two common factors associated with compensation point are CO₂ and light. Based on this there are two types of compensation point. They are CO₂ compensation point and light compensation point. C₃ plants have compensation points ranging from 40 – 60 ppm (parts per million) CO₂ while those of C₄ plants ranges from 1 – 5 ppm CO₂ .

In Latin the word respiration means “to breathe”.

Yes, Priestly’s experiments helped to find out the composition of air when burning of charcoal, carbon dioxide is produced which is the one of the composition of air done by Lavoisier. Another experiment with phosphorus done by Lavoisier was cleared that a gas which is the respirable air that is helped in burning was oxygen also a component of air. Lavoisier proved experimentally that carbon dioxide and oxygen were the components of air. Lavoisier confirmed the experiments of Priestly about the gases present in the air.

Lavoisier and Priestly.

The gas produced by combustion is carbon dioxide.

It was fixed air. In those days carbon dioxide was known as fixed air.

The answer is (b) Two

• During anaerobic respiration, the substrate is oxidized without the use of O₂. 
• As CO₂ is given out and O₂ is not used, hence the value of R.Q. is infinite.