What would be true if you compare the flow of energy and the flow of chemical nutrients in an ecosystem?
1.
Much larger amount of energy flows through the ecosystem than the amount of nutrients
2.
Energy is recycled, but nutrients are not
3.
The requirement of nutrients is obligatory for organisms but the requirement of energy is not.
4.
Nutrients are recycled, but energy is not.
Subtopic: Â Energy Flow |
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Level 2: 60%+
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Identify the incorrect statement regarding primary productivity in an ecosystem?
| 1. | It occurs only through the process of photosynthesis. |
| 2. | Almost all life on Earth relies directly or indirectly on primary production. |
| 3. | Net primary production is available for consumption by herbivores. |
| 4. | Gross primary productivity minus the respiratory loss is the net primary productivity. |
Subtopic: Â Ecosystem Productivity |
 57%
Level 3: 35%-60%
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In a terrestrial ecosystem, the abiotic factors that have most effect on its primary productivity will be:
1. light and nutrients
2. light and moisture
3. temperature and moisture
4. temperature and nutrients
1. light and nutrients
2. light and moisture
3. temperature and moisture
4. temperature and nutrients
Subtopic: Â Ecosystem Productivity |
 52%
Level 3: 35%-60%
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During the carbon cycle, carbon dioxide is returned to the atmosphere by the plants through:
1. Photosynthesis
2. Decomposition of biomass
3. Respiration
4. Transpiration
1. Photosynthesis
2. Decomposition of biomass
3. Respiration
4. Transpiration
Subtopic: Â Nutrient Cycling |
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Level 2: 60%+
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The organisms first to colonize bare rock during ecological succession are:
1. Annual plants
2. Lichens
3. Mycorrhiza
4. Green algae
1. Annual plants
2. Lichens
3. Mycorrhiza
4. Green algae
Subtopic: Â Ecological Succession |
 91%
Level 1: 80%+
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After the primary producer level in an ecosystem:
| 1. | less and less amount of new chemical energy is added at successive trophic levels |
| 2. | no new chemical energy is added at successive trophic levels |
| 3. | more and more amount of new chemical energy is added at successive trophic levels |
| 4. | less amount of new chemical energy is added at primary consumer level and then the amount of new chemical energy added to successive levels becomes more and more |
Subtopic: Â Energy Flow |
Level 3: 35%-60%
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Identify the correct statements:
1. Only II
2. Only III
3. Only II and III
4. Only I
| I: | Primary succession is faster than the secondary succession |
| II: | Both hydrarch and xerarch successions lead to mesic conditions |
| III: | Rooted submerged plants are pioneers in primary hydrarch succession |
1. Only II
2. Only III
3. Only II and III
4. Only I
Subtopic: Â Ecological Succession |
 70%
Level 2: 60%+
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Eagle | P | tertiary consumer |
| B | Cyanobacterium | Q | primary producer |
| C | Fungus | R | decomposer |
| D | Grasshopper | S | primary consumer |
Codes:
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | S | R |
| 3. | R | S | Q | P |
| D. | S | R | P | Q |
Subtopic: Â Energy Flow |
 84%
Level 1: 80%+
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| COLUMN I | COLUMN II | ||
| A | Standing crop | P | Mass of living material at each trophic level at a particular time |
| B | Standing state | Q | The amount of nutrients present in the soil at any given time |
| C | Net primary productivity | R | The rate of formation of new organic matter by consumers |
| D | Secondary productivity | S | Available biomass for the consumption to heterotrophs |
| A | B | C | D | |
| 1. | S | P | Q | R |
| 2. | P | Q | R | S |
| 3. | P | Q | S | R |
| 4. | R | P | Q | S |
Subtopic: Â Ecosystem Productivity |Â Energy Flow |
 80%
Level 1: 80%+
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In primary hydrarch succession, the seral stage just before the climax forest is likely to be:
1. Submerged free floating plant stage
2. Scrub stage
3. Marsh meadow stage
4. Reed swamp stage
1. Submerged free floating plant stage
2. Scrub stage
3. Marsh meadow stage
4. Reed swamp stage
Subtopic: Â Ecological Succession |
 67%
Level 2: 60%+
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