Unit – III BIO – GIO CHEMICAL CYCLE - BIOLOGY
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Question 1 |
Oxygen forms about ……………… of the air in the atmosphere.
30% | |
20% | |
10% | |
15% |
Question 2 |
The living components are called …………….. components.
biotic | |
abiotic |
Question 3 |
The atmosphere contains 78% of ………………….
Carbon-di-oxide | |
Nitrogen |
Question 4 |
…………. Helps in denitrification.
Azotobacter | |
pseudomonas |
Question 5 |
By burning of fuels……….. is returned to atmosphere
carbon-di-oxide | |
oxygen |
Question 6 |
……….. is a fossil fuel
Petroleum | |
Groundnut oil |
Question 7 |
………….. is the most significant element in the environment
carbon | |
Nitrogen |
Question 8 |
The loss of water from the plants is called …………………..
Evaporation | |
Transpiration | |
Condensation | |
Precipitation |
Question 9 |
About ……………… of our body is made up of water.
One-third | |
Two-fourths | |
Two-thirds | |
Three-fourths |
Question 10 |
Atmosphere contains……………… of Nitrogen.
62% | |
75% | |
78% | |
82% |
Question 11 |
Fossil fuels like coal and petroleum are a source of……………
Nitrogen | |
Hydrogen | |
Carbon | |
Potassium |
Question 12 |
………………. Is used in burning of materials.
Phosphorous | |
Carbon | |
Carbon-dioxide | |
Oxygen |
Question 13 |
Match the following
| 1 | Denitrification | a) | Fungi |
| 2 | Ammonification | b) | Pseudomonas |
| 3 | Nitrogen fixation | c) | Nitrosomonas |
| 4 | Nitrification | d) | Rhizobium |
1 4 2 3 | |
2 1 4 3 | |
4 1 2 3 | |
3 2 4 1 |
Question 14 |
Match the following
| 1 | Nitrogen fixation | a) | Ammonifying bacteria |
| 2 | Ammonification | b) | Nitrobacter |
| 3 | Nitrification | c) | Pseudomonas |
| 4 | Denitrification | d) | Nostoc |
2 3 4 1 | |
2 1 4 3 | |
3 2 4 1 | |
4 1 2 3 |
Question 15 |
Match the following
| 1 | Autotrophs | a) | Breakdown of organic waste and dead materials. |
| 2 | Oceans | b) | Producers of food for all living Organisms. |
| 3 | Decomposers | c) | Volcanic activites |
| 4 | Carbon di-oxide | d) | Store house of water |
4 2 1 3 | |
3 1 4 2 | |
2 1 4 3 | |
1 4 2 3 |
Question 16 |
- Assertion (A) : Animal proteins are secreted out in the form of urea. Uric acid or ammonia.
- Reason (R) : When plants and animals die, their proteins are broken down to release nitrates.
A and R right | |
A is right R is wrong | |
A and R are wrong | |
R explains A |
Question 17 |
- Assertion (A) : Denitrifying bacteria reduces nitrate ions of soil to gaseous nitrogen.
- Reason (R) : The atmospheric nitrogen content is maintained constant
A and R right | |
A is right R is wrong | |
A and R are wrong | |
R explains A |
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