Q. No.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
Lichens represent an intimate mutualistic relationship between a fungus and:
| 1. | an algae | 2. | a cyanobacterium |
| 3. | a brown alga | 4. | either 1 or 2 |
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
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
Not all parasitism involves feeding on the body of the host. The exception is:
1. ectoparasitism
2. endoparasitism
3. parasitoids
4. brood parasitism
A feature of ‘r’ strategists would be:
| 1. | few offspring | 2. | little parental care |
| 3. | sigmoid growth curves | 4. | a longer generation time |
The maximum population size of the species that the environment can sustain indefinitely is called as:
| 1. | biotic potential | 2. | natality |
| 3. | environmental resistance | 4. | carrying capacity |
A community of living organisms in conjunction with the nonliving components of their environment, interacting as a system is termed:
| 1. | ecosystem | 2. | species |
| 3. | biome | 4. | population |
The threat of extinction will be highest for:
| 1. | a very small population in an unstable environment |
| 2. | a moderate-sized population of r strategists |
| 3. | a large population with lots of genetic variabilities |
| 4. | a moderate sized population in a stable environment |
© 2024 GoodEd Technologies Pvt. Ltd.