Explain Verhlust - Pearl logistic growth of a population with suitable graphical representation.
Why do cattle avoid browsing on calotropis plants? explain.
Asked by pksunilnair | 12th Dec, 2017, 09:17: PM
A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and deceleration, finally an asymptote when the population density reaches the carrying capacity.
(a) Unlimited resources result in exponential growth which dep[ends on the carrying capacity of the species. The carrying capacity of a given habitat is the total number of organisms in a given species for which there are sufficient resources, so that they survive and reproduce.
(b) It is shown by the following equation-
dN/dt= rN [ (K-N)/ K]
where, N= population density at time‘t’
r= intrinsic rate of natural increase
K= carrying capacity
- This growth curve is shown by culture of yeast cells and human population.
Answered by Sivanand Patnaik | 13th Dec, 2017, 09:29: AM
- if mean and median pertaining to certain character of the populations are of same value,the following is most likely to occur, 1: a skewed curve 2: a normal distribution 3: a bi modal distribution 4: a T-shaped curve
- Why in a natural environment with plenty of food but no predation, a population shows J-shaped growth curve?
- What does the sigmoid growth curve of a population mean?
- Give an example where percentage cover is a more meaningful measure of the population size.
- Eichhornia crassipes is an alien hydrophyte introduced in India. Mention the problems posed by this plant.
- What are the two types of population growth curves? What are the phases involved in both types of curves?
- Why cannot a population live alone by itself in nature?
- (i) What is ‘r’ in the population equation? (ii) How does the increase and decrease in the value of ‘r’ affect the population size?
- Define population and community.
- (i) What is carrying capacity? (ii) Write any four population attributes.
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