Organisms and Populations — BIOLOGY STD 12 Science — Question

1. Which of the above represents the increase or decrease of population?
2. If N is the population density at time t, then what would be its density at time (t + 1)? Give the formula.
3. In a barn there were 30 rats. 5 more rats enter the barn and 6 out of the total rats were eaten by the cats. If 8 rats were born during the time period under consideration and 7 rats left the barn, find out the resultant population at time (t + 1).
4. If a new habitat is just being colonized, out of the four factors affecting the population growth, which factor contributes the most?