Introduction to Nutrient Cycling

Q.

What is a sedimentary cycle?

Q.

What Role Do Plants Play In Ecological Balance?

Q.

What is a biogeochemical cycle? What are the different types of biogeochemical cycles?

Q. The movement of nutrient elements through the various components of the ecosystem is known as .

1. nutrient cycling
2. element cycling
3. compound cycling
4. chemical cycling

Q.

What is a true ecosystem?

Q.

Which ecosystem is said to be balanced?

Q. Which of the following is absolutely essential functional component of the ecosystem?

1. Producers
2. Producers and herbivores
3. Producers and detritivores
4. Detritivores

Q. In an ecosystem, cycling of nutrients is called

1. Geological cycle
2. Chemical cycle
3. Geochemical cycle
4. Biogeochemical cycle

Q. Select the correct match from the following
I. Sedimentary nutrient – Nitrogen cycle
II. Pioneer species – Lichens
III. Secondary succession – Burned forests
IV. Pyramid of biomass in sea – Always upright

1. II and III only
2. I, II and IV only
3. I, II and III only
4. III only
5. II and IV only

Q. What are the different types of nutrient cycles found in nature ?

1. Gaseous
2. Sedimentary
3. Water
4. Oxygen cycle

Q.

Define biogeochemical cycles.

Q.

Name two types of biogeochemical cycles.

Q.

Define nutrient cycling

Q. The largest reservoir of carbon is the

1. Soil
2. Atmosphere
3. Ocean
4. Sedimentary rocks.

Q. The circulation or cycling of elements in an ecosystem is known as

1. Geological cycling
2. Geochemical cycling
3. Biogeochemical cycling
4. None of the above

Q. The function of leghaemoglobin during biological nitrogen fixation, in root nodules of legumes is to

1. Convert atmospheric N${}_2$ to NH${}_3$
2. Convert ammonia to nitrite
3. Transport oxygen for activity of nitrogenase
4. Protect nitrogenase from oxygen

Q. The movement of nutrient elements through the various components of the ecosystem is known as .

1. nutrient cycling
2. element cycling
3. compound cycling
4. chemical cycling

Q. For release of materials into the abiotic elements in an ecosystem which one of the folllowing is necessary?

1. Producers
2. Decomposers
3. Man
4. Consumers

Q. In ecosystem, cycling of nutrients is called

1. Geological cycle
2. Biogeochemical cycle
3. Geochemical cycle
4. Chemical cycle

Q. In nature major quantity of nitrogen fixation takes place by

1. Symbiotic bacteria
2. Lightnings
3. All of these
4. Blue green algae

Q. For sedimentary type of biogeochemical cycles, the reservoir is

1. atmosphere
2. water
3. earth's crust
4. living organisms

Q. The final stable community in ecological succession is termed as

1. Pioneers
2. Sere
3. Climax community
4. Carnivores

Q. Which of the following is absolutely essential functional component of the ecosystem?

1. Producers and detritivores
2. Producers
3. Producers and herbivores
4. Detritivores

Q. Choose the correct pair of nutrient and its reservoir:

1. Atmosphere
2. $\mathrm{Earth}s\mathrm{crust}$
3. $\mathrm{Carbon}$
4. $\mathrm{Phosphorus}$
5. $\mathrm{Sulphur}$
6. $\text{Crust \& Atmosphere}$

Q. If the nitrogenase enzyme has been inactivated by radiation, there will be no _________.

1. Fixation of nitrogen by legumes
2. Fixation of atmospheric nitrogen
3. Conversion of nitrate to nitrite in legumes
4. Conversion of ammonia to nitrate in soil

Q. Choose the correct pair of nutrient and its reservoir:

1. Atmosphere
2. $\mathrm{Earth}\text{'}s\mathrm{crust}$
3. $\mathrm{Carbon}$
4. $\mathrm{Phosphorus}$
5. $\mathrm{Sulphur}$
6. $\text{Crust \& Atmosphere}$

Q. What do you mean by Nutrient cycle?

Q. Assertion :Nitrogen fixing bacteria of legume nodule live in oxygen depleted cells. Reason: Leghaemoglobin completely removes oxygen from nodule cells.

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. Write important features of a sedimentary cycle in an ecosystem.

Q. Study of biogeochemical cycles is called as biogeochemistry, it involves

1. Cycling of energy
2. Cycling of gases
3. Cycling of nutrients
4. Cycling of water