Q3 of 45 Page 178

Which substances are produced by anaerobic respiration in yeast?

In anaerobic respiration, the product can be either lactic acid or ethanol + CO2 on the basis of enzyme involved. Yeast contains the enzyme alcohol dehydrogenase which helps in the formation of alcohol. Due to this reason, fermentation will occur in yeast which will result in the formation of alcohol and CO2.

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1

Which process occurring in human body does not involve energy from respiration?

 2

Assertion (A) In the day time, CO2 generated during respiration is used up for photosynthesis.

Reason (R) There is no CO2 release during day.

 4

The following changes take place in an athlete’s body during a 100m race. Which change occurs first?

 5

The diagram shows part of the human gas exchange system.


What are W, X, Y and Z?