Primary Productivity

Q.

Productivity is the rate of production of biomass expressed in terms of:

i. $\left(kcal{m}^{–3}\right)y{r}^{–1}$

ii. $g{m}^{–2}y{r}^{–1}$

iii. $g^{–1}y{r}^{–1}$

iv. $kcal{m}^{–2}y{r}^{–1}$

1. ii

2. iii

3. ii and iv

4. i and iii

Q. Ecological efficiency is:

1. $\frac{\text{Food primary assimilated}}{\text{food energy ingested}}\times 100$
2. $\frac{\text{Gross primary productivity}}{\text{incident total solar radiation}}\times 100$
3. $\frac{\text{Net primary productivity}}{\text{Gross primary productivity}}\times 100$
4. Volume of $C{O}_2\frac{\text{evolved}}{\text{volume}}$ of $O_2$ consumed

Q.

What is the primary productivity? Give the brief description of factors that affect primary productivity.

Q. Energy stored at the consumer level is :

1. Gross primary productivity
2. Net primary productivity
3. Net productivity
4. Secondary productivity

Q.

Read the given statements and select the correct option
Statement 1: Net primary productivity is less than gross primary productivity
Statement 2: Net primary productivity is equal to gross primary productivity minus the respiratory losses

1. Both statements 1 & 2 are correct
2. Statement 1 is correct but statement 2 is incorrect
3. Statement 1 is incorrect but statement 2 is correct
4. Both statements 1 and 2 are incorrect

Q.

The net primary productivity of an ecosystem is

1. Total weight of green plants-respiratory losses

2. Total weight of green plants+Respiratory losses

3. Respiratory losses alone

4. None of the above

Q. Primary productivity refers to the

1. total biomass of the photosynthetic organisms in the ecosystem.
2. rate of decomposition by the detritivores.
3. 
   the rate of photosynthesis in plants and photosynthetic bacteria as compared to the rate of plant consumption by herbivores
4. the total amount of light energy converted to organic compounds in a given area per unit time by producers.

Q.

Primary productivity is measured in terms of

1. Kg per $m^2$ per yr

2. g per $m^2$ per yr

3. Tonnes per hectare per yr

4. All correct

Q.

Productivity is the rate of production of biomass expressed in terms of:

i. $\left(kcal{m}^{–3}\right)y{r}^{–1}$

ii. $g{m}^{–2}y{r}^{–1}$

iii. $g^{–1}y{r}^{–1}$

iv. $kcal{m}^{–2}y{r}^{–1}$

1. ii

2. iii

3. ii and iv

4. i and iii

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Which of the following is expected to have the highest value (gm/$m^2$ /year) in a grassland ecosystem?

1. Net production (NP)
2. Gross production (TP)
3. Tertiary production (GP)
4. Secondary production (SP)

Q. In an ecosystem, the rate of production of organic matter during photosynthesis is termed as

1. Secondary productivity.
2. Net productivity.
3. Gross primary productivity.
4. Net primary productivity.

Q.

What is primary productivity? Give brief description of factors that affect primary productivity.

Q.

Primary productivity is measured in terms of

1. All correct

2. Kg per $m^2$ per yr

3. g per $m^2$ per yr

4. Tonnes per hectare per yr

Q.

Read the given statements and select the correct option
Statement 1: Net primary productivity is less than gross primary productivity
Statement 2: Net primary productivity is equal to gross primary productivity minus the respiratory losses

1. Both statements 1 & 2 are correct
2. Statement 1 is correct but statement 2 is incorrect
3. Statement 1 is incorrect but statement 2 is correct
4. Both statements 1 and 2 are incorrect

Q. Productivity is the rate of production of biomass expressed in terms of:

1. $\left(kcal{m}^{–3}\right)y{r}^{–1}$
2. $g{m}^{–2}y{r}^{–1}$
3. $g^{–1}y{r}^{–1}$
4. $kcal{m}^{–2}y{r}^{–1}$

Q. Stability of ecosystem depends upon

1. Primary productivity
2. Number of consumers
3. Interaction between producers and consumers
4. Number of producers

Q. The mass of living material at a trophic level at a particular time is called

1. Net primary productivity.
2. Standing state.
3. Standing crop.
4. Gross primary productivity.

Q. Productivity is the rate of production of biomass expressed in terms of:

1. $\left(kcal{m}^{–3}\right)y{r}^{–1}$
2. $g{m}^{–2}y{r}^{–1}$
3. $g^{–1}y{r}^{–1}$
4. $kcal{m}^{–2}y{r}^{–1}$

Q. Primary productivity refers to the

1. 
   the rate of photosynthesis in plants and photosynthetic bacteria as compared to the rate of plant consumption by herbivores
2. the total amount of light energy converted to organic compounds in a given area per unit time by producers.
3. rate of decomposition by the detritivores.
4. total biomass of the photosynthetic organisms in the ecosystem.

Q. Energy stored at the consumer level is :

1. Gross primary productivity
2. Net primary productivity
3. Net productivity
4. Secondary productivity

Q.

Productivity is the rate of production of biomass expressed in terms of:

i. $\left(kcal{m}^{–3}\right)y{r}^{–1}$

ii. $g{m}^{–2}y{r}^{–1}$

iii. $g^{–1}y{r}^{–1}$

iv. $kcal{m}^{–2}y{r}^{–1}$

1. ii

2. ii and iv

3. i and iii

4. iii

Q.

The net primary productivity of an ecosystem is

1. Total weight of green plants-respiratory losses

2. Total weight of green plants+Respiratory losses

3. Respiratory losses alone

4. None of the above

Q. The number of primary producers within a specified area would be maximum in

1. Tundra
2. Grasslands
3. Deserts
4. Rainforests

Q. The number of primary producers within a specified area would be maximum in

1. Grasslands
2. Deserts
3. Tundra
4. Rainforests

Q. Very Short Answer Type Questions :
Write the equation that helps in deriving the net primary productivity of an ecosystem.