Page 2 - Assignment

7. Darwinian fitness is represented by:
1. Low r value
2. High r value
3. High K value
4. Low K value
8. Under a particular set of selection pressures, organisms evolve towards the most
efficient:
1. Thermoregulation
2. Water conservation
3. Respiration
4. Reproduction strategy
9. In a tide pool, 15 species of invertebrates were reduced to 8 after one species was
removed. The removed species may be a:
1. Parasite
2. Mutualist
3. Top predator
4. Herbivore
10. Very small animals are rarely found in polar region mainly because:
1. Smaller animals have a relatively slower heart rate
2. Smaller animals have a more surface area relative to their volume
3. Smaller animals are invariably herbivores
4. Smaller animals rely on diffusion for exchange of gases with the environment

B. Very Short Answer Questions (1 mark each)

1. Which are the factor responsible for the wide variety of habitat formed within each
biome?
2. Fresh water animals are unable to survive for long in sea water. Give reason.
3. With which population growth model is the Verhulst Pearl equation associated?
4. Define diapause. Which organisms exhibit it?
5. Calculate the death rate if 6 individuals in a laboratory population of 60 fruit flies died
during aparticular week.
6. In biological control method, one living organism is used against another to check its
uncontrolledgrowth. Which kind of population interaction is involved in this?
7. An organism has to overcome stressful condition for a limited period of time. Which
strategiescan it adopt to do so?
C. Short Answer Questions-II (2 marks each)

8. What are the four levels of biological organisation with which ecology basically deals?
9. Differentiate between stenohaline and euryhaline organisms.