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Which of the following statements are tr...

Which of the following statements are true ?
1. Gross primary productivity is always greater than Net Primary productivity .
2. Gross primary productivity plus the respiration losses give us Net Primary productivity .
3. The rate of respiration of plants affects the Net Primary productivity .
4. Net primary productivity + Gross primary productivity = Respiratory loss.

A

1 - True , 2 - False , 3 - True , 4 - False

B

1 - True , 2 - True , 3 - False , 4 - False

C

1 - False , 2 - False , 3 - True , 4 - True

D

1 - True , 2 - True , 3 - True , 4 - False

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about Gross Primary Productivity (GPP) and Net Primary Productivity (NPP) are true, let's analyze each statement step by step. ### Step 1: Understand Gross Primary Productivity (GPP) and Net Primary Productivity (NPP) - **Gross Primary Productivity (GPP)** is the total rate at which organic material is produced by photosynthesis in a given area over a specific time period. - **Net Primary Productivity (NPP)** is the rate at which organic material is accumulated in excess of respiration. It can be calculated using the formula: \[ NPP = GPP - R \] where \( R \) is the respiration loss. ### Step 2: Analyze Each Statement 1. **Statement 1**: "Gross primary productivity is always greater than Net Primary Productivity." - This statement is **True** because GPP includes all the organic material produced, while NPP accounts for the energy lost through respiration. Thus, GPP is always greater than or equal to NPP. 2. **Statement 2**: "Gross primary productivity plus the respiration losses give us Net Primary Productivity." - This statement is **False**. The correct relationship is: \[ NPP = GPP - R \] Therefore, GPP plus respiration losses does not equal NPP. 3. **Statement 3**: "The rate of respiration of plants affects the Net Primary Productivity." - This statement is **True**. Since NPP is calculated by subtracting respiration from GPP, any change in the rate of respiration will directly affect NPP. 4. **Statement 4**: "Net primary productivity + Gross primary productivity = Respiratory loss." - This statement is **False**. The correct relationship is: \[ R = GPP - NPP \] Therefore, NPP plus GPP does not equal respiratory loss. ### Conclusion Based on the analysis: - Statement 1: True - Statement 2: False - Statement 3: True - Statement 4: False Thus, the true statements are 1 and 3. ### Final Answer The true statements are: 1. Gross primary productivity is always greater than Net Primary Productivity. 3. The rate of respiration of plants affects the Net Primary Productivity. ---
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