Gross Primary Productivity

Q. DDT causes egg shell thinning in birds because it disturbs

1. potassium metabolism
2. magnesium metabolism
3. calcium metabolism
4. carbonic metabolism

Q. Select the incorrect statement for productivity in the ecosystem.

1. GPP is rate of production of organic matter by producers during photosynthesis per unit time and area
2. NPP is less than GPP
3. GPP is available biomass for consumption to heterotrophs
4. NPP is rate of organic matter stored by producers in excess of respiratory loss

Q.

Find out how much cellulose is made by all the plants in the biosphere and compare it with how much of paper is manufactured by man and hence what is the consumption of plant material by man annually. What a loss of vegetation!

Q.

The rate at which light energy is converted into chemical energy in ecosystems:

1. Net secondary productivity

2. Gross primary productivity

3. Net primary productivity

4. Gross secondary productivity

Q.

The rate at which light energy is converted into chemical energy in ecosystems:

1. gross secondary productivity

2. net secondary productivity

3. gross primary productivity

4. net primary productivity

Q. Gross primary productivity is the rate at which organic matter is synthesised by producers per unit area and time.

1. True
2. False

Q. Energy stored at consumer level is known as

1. net community productivity
2. gross primary productivity
3. Net primary productivity
4. Secondary productivity

Q.

Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

1. Secondary productivity

2. Tertiary productivity

3. Gross primary productivity (GPP)

4. Net primary productivity (NPP)

Q. Gross primary productivity is the rate at which organic matter is synthesised by producers per unit area and time.

1. True
2. False

Q. Secondary productivity is the rate of formation of new organic matter by _____.

1. Producer
2. Parasite
3. Consumer
4. Decomposer

Q.

Assertion: The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity
Reason: Gross primary productivity is the rate at which consumers convert the chemical energy of their food into their own biomass

1. Both assertion and reason are true and the reason is the correct explanation of assertion

2. Assertion is true but the reason is false

3. Assertion and reason are false

4. Both assertion and reason are true but the reason is not the correct explanation of assertion

Q. Percentage of photosynthetically active radiation (PAR) in the incident solar radiation is?

1. $1-5\%$
2. Less than $50\%$
3. $2-10\%$
4. Approx. $100\%$

Q.

Find out how much cellulose is made by all the plants in the biosphere and compare it with how much of paper is manufactured by man and hence what is the consumption of plant material by man annually. What a loss of vegetation!

Q. The biomass available for consumption by the herbivores and the decomposers is called

1. net primary productivity
2. gross primary productivity
3. standing crop
4. secondary productivity

Q. In an ecosystem the rate of formation of organic matter during photosynthesis is termed as :

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

Q. In an ecosystem the rate of formation of organic matter during photosynthesis is termed as :

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

Q.

Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

1. tertiary production

2. gross production (GP)

3. net production (NP)

4. secondary production

Q. Gross primary productivity is the rate at which organic matter is synthesised by producers per unit area and time.

1. False
2. True