Definition of Biomass

Q.

What is the main difference between oligotrophic and eutrophic lakes?

Q.

What do you understand by primary and secondary productivity?

Q.

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

1. Secondary productivity

2. Net primary productivity

3. Standing crop

4. Gross primary productivity

Q.

Total organic matter present in an ecosystem is called?

Q. If $C{o_2}^{}$ is removed totally from the biosphere, which organisms will be affected first?

1. Secondary consumers
2. Teritary consumers
3. Producers
4. Primary producers

Q. The amount of living material present at different trophic levels at a given time is called ___________ .

1. DFC
2. GFC
3. biomass
4. standing crop

Q. Which ecosystem has the highest gross primary productivity?

1. Desserts
2. Coral reefs
3. Mangroves
4. Grasslands

Q. Read the following statements related to the ecosystem and identify the correct statements?

I. Ecosystem receives input in the form of solar energy and inorganic matter
II. Ecosystems give output in the form of heat and waste matter
III. A regular input of energy is essential for maintaining the ecosystem​​​​

1. Only I and II
2. I, II and III
3. Only II and III
4. Only I and III

Q. Assertion :GFC is major conduit for energy flow in aquafic ecosystem. Reason: DFC may be connected with GFC at some levels.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Assertion :Net primary productivity is gross primary productivity minus respiration. Reason: Secondary productivity is produced by heterotrophs.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

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

Q. How many equations are correct for Productivity
(a) NCP=NPP-GSP
(b) GPP=NPP+R
(C) NPP=GPP-R
(d) NSP=GSP-R
(e) NSP=GPP-R
(f) NPP=NCP+GSP

1. only A, C, D are correct
2. only C, D, F are correct
3. only A, B, C, D are correct
4. A, B, C, D, F are correct.

Q. Arrange the following ecosystems in increasing order of their mean NPP(tons/ha/year).
A. Tropics deciduous forest
B. Temperature coniferous forest
C. Tropical rainforest
D. Temperate deciduous forest.

1. B $<$ D $<$ A $<$ C
2. D $<$ B $<$ A $<$ C
3. A $<$ C $<$ D $<$ B
4. B $<$ A $<$ D $<$ C

Q. Maximum photosynthesis takes place by

1. Zooplankton
2. Marsh plants
3. Phytoplankton
4. Woody plants

Q.

Maximum CO₂ fixation is done by

1. Zooplanktons

2. Bacteria

3. Green plants

4. Phytoplanktons

Q. Assertion :Net primary productivity is less than the gross primary productivity. Reason: Net primary productivity is equal to the gross primary productivity minus the respiration losses.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Explain primary productivity and the factors that influence it.

Q. What does 'R' represent in the given equation for productivity in an ecosystem? GPP-R=NPP

Q. What is primary production?

Q. How are productivity, gross productivity, net primary productivity and secondary productivity interrelated.

Q. What is hydroponics?

Q. Assertion: The Earth is a closed system for mineral cycle.

Reason: Mineral cycle takes place between abiotic and biotic components of earth.

1. Both the assertion and reason are true and the reason is the correct explanation of the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false
4. Both the assertion and reason are false

Q. What is primary productivity? Why does it vary in different types of ecosystems?

Q. Productivity is the rate of production of biomass expressed in terms of.
(i) $\left(kcal{m}^{-3}\right)y{r}^{-1}$
(ii) $g^{-2}y{r}^{-1}$
(iii) $g^{-1}y{r}^{-1}$
(iv) $\left(kcal{m}^{-2}\right)y{r}^{-1}$

1. (ii)
2. (iii)
3. (ii) and (iv)
4. (i) and (iii)

Q. Describe the inter relationship between productivity, gross primary productivity and net productivity.

Q. Which of these ecosystems has the lowest primary productivity per square meter?

1. Salt marsh
2. Open ocean
3. Grassland
4. Tropical forest

Q. The annual net primary productivity of the whole biosphere is approximately.

1. $150$ billion tons
2. $170$ billion tons
3. $160$ billion tons
4. $180$ billion tons

Q. Biomass available for consumption by herbivores and decomposers is called

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

Q. Which of the following is expected to have the highest value ($gm/m^2/yr$) in a grassland ecosystem?

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

Q. Gross primary productivity of an ecosystem is 170 tons of organic matted and amount used in respiration is 50 tons. Calculate the net primary productivity of the ecosystem.

1. 120 tons
2. 100 tons
3. 70 tons
4. 12 tons
5. 17 tons