Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced on the island due to:
1. Habitat fragmentation
2. Better browsing efficiency of goats
3. Predator of goat attacking tortoise
4. Virus of goats parasitizing tortoise
“Competitive Exclusion Principle” may be true if:
1. | The competing species are equally capable |
2. | Resource partitioning occurs |
3. | There is only intraspecific competition |
4. | Resources are limiting |
One mechanism that promotes co-existence rather than exclusion amongst competing species is:
1. | Periodic migration | 2. | Hibernation and aestivation |
3. | Resource partitioning | 4. | Reproductive isolation |
Cuckoos laying their eggs in the nests of crow is an example of:
1. | Ectoparasitism | 2. | Endopararsitism |
3. | Hyperparasitism | 4. | Brood parasitism |
An orchid growing as an epiphyte on a mango branch is an example of:
1. | Ectoparasitism | 2. | Endopararsitism |
3. | Commensalism | 4. | Mutualism |
All the following relations are examples of commensalism except:
1. | Sea anemone and clown fish |
2. | Cattle egret and grazing cattle |
3. | Barnacles growing on the back of whale |
4. | Cuscuta growing on hedge plants |
In mycorrhiza, the fungi help the plant in:
1. Synthesis of high energy carbohydrates
2. Absorption of essential nutrients from the soil
3. Nitrogen fixation
4. Biocontrol of pathogens
The fig tree is pollinated by a:
1. | Honeybee | 2. | Wasp |
3. | Bird | 4. | Moth |
To get pollinated by a bee, the Mediterranean Orchid, Ophrys, employs:
1. Sexual deceit
2. Pseudo-copulation
3. Reward in the form of nectar
4. Place for laying eggs
A population with a population pyramid that has an extremely broad base will most likely be:
1. | a rapidly expanding population |
2. | a stable population |
3. | a population where the birth rate equaled the death rate |
4. | a population where there were more old than young individuals |