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R.Q. is zero in...

R.Q. is zero in

A

Succulents

B

Germinating fatty seeds

C

Maturing fatty seeds

D

Anaerobic respiration.

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### Step-by-Step Solution: 1. **Understanding R.Q. (Respiratory Quotient)**: - The Respiratory Quotient (R.Q.) is defined as the ratio of the volume of carbon dioxide (CO2) produced to the volume of oxygen (O2) consumed during respiration. - Mathematically, R.Q. = CO2 produced / O2 consumed. 2. **Analyzing the Options**: - **Succulents**: These are plants that store water in their leaves, stems, or roots. They often undergo respiration in the absence of light, leading to incomplete oxidation of substrates. - **Germinating Fatty Seeds**: These seeds typically have an R.Q. greater than 1 because they consume oxygen and produce more CO2 during the breakdown of fats. - **Maturing Fatty Seeds**: Similar to germinating seeds, these also have an R.Q. greater than 1. - **Anaerobic Respiration**: This process occurs without oxygen and results in the production of ethanol or lactic acid, leading to an infinite R.Q. since no oxygen is consumed. 3. **Identifying the Correct Answer**: - In succulents, during dark conditions, they undergo incomplete oxidation, which means they do not release CO2. Therefore, the R.Q. becomes 0 (since CO2 produced is 0). - For the other options, the R.Q. values are greater than 1 or infinite, which does not fit the criteria of having an R.Q. of 0. 4. **Conclusion**: - The correct answer is **Succulents**, as they exhibit an R.Q. of 0 during specific conditions due to incomplete oxidation.
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