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Q. No.The organisms first to colonize bare rock during ecological succession are:
1. Annual plants
2. Lichens
3. Mycorrhiza
4. Green algae
91%
From NCERT
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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: Energy Flow |
From NCERT
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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
70%
From NCERT
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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: Energy Flow |
83%
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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: Ecosystem Productivity | Energy Flow |
80%
From NCERT
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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
67%
From NCERT
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Identify the correct statement:
I. PAR designates the spectral range of solar radiation from 400 to 700 nanometers
II. PAR is less than 50% of the incident solar radiation
III. Plants capture only 2 to 10% of PAR
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
I. PAR designates the spectral range of solar radiation from 400 to 700 nanometers
II. PAR is less than 50% of the incident solar radiation
III. Plants capture only 2 to 10% of PAR
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Energy Flow |
80%
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The trophic level of an organism is the number of steps it is from the start of the food chain. The Level 2 typically will be occupied by:
| 1. | Primary producer | 2. | Herbivore |
| 3. | Carnivore | 4. | Apex predator |
Subtopic: Energy Flow |
88%
From NCERT
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If plants convert about 1% of the sunlight they receive into chemical energy, the total energy originally present in the incident sunlight that is finally embodied in a tertiary consumer is about:
1. 0.1%
2. 0.01%
3. 0.001%
4. 0.0001%
1. 0.1%
2. 0.01%
3. 0.001%
4. 0.0001%
Subtopic: Energy Flow |
68%
From NCERT
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Consider the following facts regarding nutrient cycling:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I. | Carbon cycle | Atmosphere only contains 10 % of total global carbon. |
| II. | Phosphorus cycle | Respiratory release of phosphorus into atmosphere is absent. |
| III. | Nitrogen cycle | Only prokaryotes are capable of carrying out biological nitrogen fixation. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
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