DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:
| 1. | Chilled chloroform |
| 2. | isopropanal |
| 3. | Chilled ethanol |
| 4. | Methanol at room temperature |
Match the Column-I with Column-II
|
Column-I |
Column-II |
||
|
(a) |
Saprophyte |
(i) |
Symbiotic association of fungi with plant roots |
|
(b) |
Parasite |
(ii) |
Decomposition of dead organic materials |
|
(c) |
Lichens |
(iii) |
Living on living plants or animals |
|
(d) |
Mycorrhiza |
(iv) |
Symbiotic association of algae and fungi |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (iii) | (ii) | (i) | (iv) |
| 4. | (ii) | (i) | (iii) | (iv) |
Which of the following ecological pyramids is generally inverted?
1. Pyramid of biomass in a sea
2. Pyramid of numbers in grassland
3. Pyramid of energy
4. Pyramid of biomass in a forest
Which one of the following is not a method of in situ conservation of biodiversity
1. Sacred Grove
2. Biosphere Reserve
3. Wildlife Sanctuary
4. Botanical Garden
Which of the following is the most important cause for animals and plants being driven to extinction?
1. Alien species invasion
2. Habitat loss and fragmentation
3. Drought and floods
4. Economic exploitation
The Earth Summit held in Rio de Janeiro in 1992 was called:
| 1. | for immediate steps to discontinue use of CFCs that were damaging the ozone layer |
| 2. | to reduce emissions and global warming |
| 3. | for conservation of biodiversity and sustainable utilization of its benefits |
| 4. | to asess threat posed to native species by invasive weed species |
Which of these following methods is the most suitable for disposal of nuclear waste?
1. Bury the waste within rocks deep below the Earth's surface
2. Shoot the waste into space
3. Bury the waste under Antarctic ice-cover
4. Dump the waste within rocks under deep ocean
Which of the following pair of gases is mainly responsible for the greenhouse effect?
1. Carbon dioxide and methane
2. Ozone and Ammonia
3. Oxygen and Nitrogen
4. Nitrogen and Sulphur dioxide
Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:
1. making tubes and pipes
2. making plastic sacks
3. use as a fertilizer
4. construction of roads
Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?
1. Geneva protocol
2. Montreal protocol
3. Kyoto protocol
4. Gothenburg protocol
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