The most effective biologic control of insects is achieved by:
1. | insectivorous birds | 2. | biocides |
3. | parasitoid wasps | 4. | parasitic nematodes |
We all know that water hyacinth is an invasive plant that has caused havoc in many water bodies in our country. But it has some usefulness as well. This includes:
I. Substrate for biogas production
II. Bio cleaning of industrial waters
III. Source of effective antipyretic
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
Exploring molecular, genetic and species-level diversity for products of economic importance is called as:
1. | Molecular pharming | 2. | rDNA technology |
3. | Bioprospecting | 4. | Bioharvesting |
Which of the following is a biocide that was first to be used on a large scale?
1. | DDT | 2. | 2,4-D |
3. | Mercury | 4. | Methane |
The type of species that will most likely be supported by small parks will be:
1. | k - selected species | 2. | r - selected species |
3. | climax species | 4. | species with small niches |
Plants are an important source of medicines for human use. Identify the incorrectly matched pair:
|
PLANT |
MEDICINE |
1. |
Taxusbrevifolia |
Anticancer drug |
2. |
Cinchona officinalis |
Anti-malarial |
3. |
Rauwolfiaserpentina |
Anti-hypertensive |
4. |
Catharanthusroseus |
Anti-helminthic |
Overexploitation is one of the “evil quartet” that increases the risk of extinction mainly for the:
1. animals that feed on a lower trophic level
2. large animals with low intrinsic reproductive rates
3. aquatic animals
4. terrestrial organisms
Exotic alien introduced species can become invasive in the introduced ecosystem due to:
I. preying on native species.
II. out-competing native species for food, light, and breeding habitat.
III. lack of natural predators.
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
Habitat loss and fragmentation lead to loss of biodiversity primarily because:
1. | less plants in fragmented habitats leads to less photosynthesis. |
2. | more soil erosion takes place in fragmented habitats. |
3. | smaller populations in fragmented habitats are more prone to extinction. |
4. | animals migrate out of smaller habitat fragments. |
The most serious negative impact of loss of biodiversity on humans would be due to:
1. global warming and ozone depletion.
2. loss of ecosystem services.
3. loss of source of genetic diversity to preserve endangered species.
4. loss of species for ʺbioprospecting.ʺ