CBSE
Multiple Choice QuestionsMatch the following column I with column II.
| Column I | Column II |
| A. Pollen grains | 1. Photochemical smog |
| B. PAN | 2. Particulate pollution |
| C. CO2 | 3. Global warming |
| D. Cadmium | 4. Itai- itai disease |
A- 2; B- 1; C- 3; D- 4
A- 4; B- 2; C- 1; D- 3
A- 1; B- 2; C- 3; D- 4
A- 3; B- 1; C- 2; D- 4
Match the items in column I with those in column II and choose the correct answer.
| Column I | Column II |
| A. Thiobacillus | 1. Nitrogen- fixation |
| B. Nitrosomonas | 2. Ammonification |
| C. Azotobacter | 3. Nitrification |
| D. Pseudomonas | 4. Denitrification |
A- 4; B- 3; C- 1; D- 2
A- 3; B- 4; C- 1; D- 2
A- 4; B- 2; C- 1; D- 3
A- 2; B- 1; C- 3; D- 4
Two related but geographically isolated species are known as
sibling species
sympatric species
taxonomic species
allopatric species
Pyramid of biomass is more real than the pyramid of number; because
The former take the size of individuals into consideration, but the later does not
Number of individuals are easier to count than calculating biomass
Less number of parameters are considered in the former, but the later accounts the whole existing conditions
The former may be inverted in some cases, but the later is always upright
Match the following column I with column II.
| Column I | Column II |
| A. Producer | 1. Herbivores |
| B. Primary consumer | 2. Green plants |
| C. Secondary consumers | 3. Saprotrophs |
| D. Decomposer | 4. Carnivores |
A- 1; B- 2; C- 3; D- 4
A- 2; B- 1; C- 4; D- 3
A- 2; B- 4; C- 3; D- 1
A- 3; B- 2; C- 1; D- 4
The overlapping zone in between two ecosystems is known as
ecozone
biotope
ecotone
buffer zone
The number of taxa present in a particular area of an ecosystem is
- diversity
- diversity
- diversity
- diversity
Match the following column I with column II
| Column I | Column II |
| A. Cytology | 1. Study of fossils |
| B. Entomology | 2. Study of cells |
| C. Palaentology | 3. Study of birds |
| D. Ornithology | 4. Study of insects |
A- 2; B- 3; C- 4; D- 1
A- 2; B- 4; C- 1; D- 3
A- 1; B- 2; C- 4; D- 3
A- 3; B- 2; C- 1; D- 4
Read the following statements.
I. Ocean acts as the global sink for CO2.
II. The atmospheric input of carbon from rainfall is greater.
III. Carbon gas is exchanged between organisms and atmosphere during respiration.
IV. Human activities are increasing CO2 concentration in the atmosphere.
Choose the incorrect options.
Only I
II and IV
Only III
None of the above
The animal species controlling the ecosystem functioning is known as
edge species
pioneer species
keystone species
umbrella species
