Total Productivity of an Ecosystem

Q. Measurement of biomass in terms of dry weight is more accurate. Why?

Q. The final stable community in ecological succession is

1. climax
2. pioneers
3. sere
4. carnivores

Q.

What is meant by mass extinction?

Q. What would happen to all the energy fixed by autotrophic organisms if the community has no animals to eat the plants?

Q.

What are limiting factors?

Q. Competition for nutrients, food, light and space is more severe between two:

1. Unrelated species occupying different niches
2. Unrelated species occupying the same niche
3. Closely related species occupying different niches
4. Closely related species occupying the same niche

Q. Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as:

1. In situ cryo- conservation of biodiversity
2. Ex situ conservation of biodiversity
3. In situ conservation of biodiversity
4. Ex situ conservation by sacred groves

Q. Assertion : Ex situ conservation is no longer about keeping threatened species in enclosures.
Reason : Gametes, embryos, tissues or seeds of endangered plants or animals can be conserved via techniques of cryopreservation, gene banks, seed banks, etc.

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

Q. Describe the inter-relationship between productivity, gross primary productivity and net productivity. [3]

Q. Two species competing for the same resource can avoid competition by choosing different times for feeding. It is known as ___(i)______ and was supported by ___(ii)______.

1. (i) - competitive exclusion, (ii) - Gause
2. (i) - competitive exclusion, (ii) - MacArthur
3. (i) - resource partitioning, (ii) - MacArthur
4. (i) - resource partitioning, (ii) - Gause

Q. Ecosystem having the highest primary productivity is

1. Pond
2. Ocean
3. Desert
4. Forest

Q. Complete the given analogy.

Rock : Lithosere :: Sand : ______

1. Psammosere
2. Hydrosere
3. Halosere
4. Xerosere

Q.

The type of ecosystem with the highest mean plant productivity is

1. Tropical rain forest

2. Temperate grassland

3. Tundra

4. Desert

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

1. consumers
2. decomposers
3. producers
4. parasites

Q.

How is biodiversity important for ecosystem functioning?

Q. Maximum photosynthesis take place by :

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

Q. ___ is the rate of biomass accumulation at a specific period of time in the ecosystem.

Q. Explain how diversity of living organisms helps in enriching any ecosystem.

Q. Which one has the maximum biomass?

1. Taiga
2. Alpine vegetation
3. Tropical rain forest
4. Temperate forest

Q.

What is an ecosystem service? List any four important ecosystem services provided by the natural ecosystems. Are you in favour or against levying a charge on the service provided by the ecosystem?

Q.

Species diversity influences the productivity of the ecosystem by:

1. Complementary interactions between species

2. All of the above

3. The presence of architecture species

4. Ensuring the efficient use of resources

Q. Two species competing for the same resource can avoid competition by choosing different habits. This phenomenon is called______ and was supported by _______ .

1. competitive exclusion, Gause
2. competitive exclusion , MacArthur
3. resource partitioning, Gause
4. resource partitioning, MacArthur.

Q. In general, which ecosystem has the greatest species biodiversity?

1. Tropical rainforest
2. Desert
3. Tundra
4. Temperate deciduous forest
5. Grassland

Q. Which one of the following biomes has evergreen vegetation and animal well adapted to drought?

1. Chaparral
2. Tundra
3. Pampas
4. Velds

Q. In what way a plant growing on a forest floor is adapted for its survival?

1. Has shallow roots
2. Requires low light
3. Requires strong light
4. Requires moist soil
5. Has a deep ta root

Q. While on a journey up in the hills you may come across a thick forest of Pinus geradiana. What do you think is the altitude of that region from sea level?

1. 1000 to 2000 feet
2. 6000 to 7000 feet
3. Above 12000 feet
4. 3000 to 4000 feet

Q. Write brief notes on the following:
(a) Photosystem II and photosystem I
(b) Budding
(c) Parthenocarpy
(d) Global warming
(e) Secondary air pollutants.

Q. Solar energy can be trapped to the maximum capacity by

1. Planting trees
2. Crops
3. Grasses
4. Xerophytic plants

Q. An aquatic ecosystem with maximum primary productivity is

1. Ocean
2. River
3. Pond
4. Estuary

Q.

Species diversity influences the productivity of the ecosystem by:

1. Ensuring the efficient use of resources

2. Complementary interactions between species

3. The presence of architecture species

4. All of the above