Question
Comment on the growth curve given below.
✓
Answer
A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and deceleration and finally an asymptote, when the population density reaches the carrying capacity. A’ plot of N in relation to time (t) results in a sigmoid curve. This type of population growth is called Verhulst-Pearl Logistic Growth and is described by the following equation:
$\frac{\text{dN}}{\text{dt}}=\text{rN}\Big(\frac{\text{K}-\text{N}}{\text{K}}\Big)\\\ \ \\\frac{\text{dN}}{\text{dt}}=\text{rN}\Big(1-\frac{\text{N}}{\text{K}}\Big)$
$\Big(1-\frac{\text{N}}{\text{K}}\Big)$ Environmental resistance.
$\frac{\text{dN}}{\text{dt}}=\text{rN}\Big(\frac{\text{K}-\text{N}}{\text{K}}\Big)\\\ \ \\\frac{\text{dN}}{\text{dt}}=\text{rN}\Big(1-\frac{\text{N}}{\text{K}}\Big)$
$\Big(1-\frac{\text{N}}{\text{K}}\Big)$ Environmental resistance.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is a biogeochemical cycle. What is the role of the reservoir in a biogeochemical cycle. Give an example of a sedimentary cycle with reservoir located in earth’s crust.
Match the items of column A with those given in column B.
|
S. No
|
Column A
|
S. No
|
Column B
|
|
(i)
|
Eli Lilly
|
(a)
|
Cotton bollworm
|
|
(ii)
|
Pest resistance
|
(b)
|
Meloidegyne incognitia
|
|
(iii)
|
Crylab
|
(c)
|
Golden Rice
|
|
(iv)
|
CryIAC
|
(d)
|
Humulin
|
|
(v)
|
RNAi
|
(e)
|
Corn borer
|
|
(vi)
|
Vitamin A
|
(f)
|
Bt cotton
|
Describe various methods of asexual reproduction in animals.
Where does spermatogenesis occur in human testes? Describe the process of spermatogenesis upto the formation of spermatozoa.
- The graph below represents the growth patterns of two types of aquatic organisms over a brief period of time in a water body, surrounded by agricultural land, extensively supplied with fertilisers. Identify the organisms that would represent: (i) A and (ii) B.
- State the reason for such a change in the water body and also write the term given to it.
- List the three different allelic forms of gene ‘I’ in humans. Explain the different phenotypic expressions, controlled by these three forms.
- A woman with blood group'A'marries a man with blood group 'O'. Discuss the possibilities of the inheritance of the blood groups in the following, starting with 'yes' or 'no' for each:
- They produce children with blood group ‘A’ only.
- They produce children, some with 'O' blood group and some with 'A' blood group.
A species-area curve is drawn by plotting the number of species against the area. How is it that when a very large area is considered the slope is steeper than that for smaller areas?
A flower of brinjal plant following the process of sexual reproduction produces 360 viable seeds.
Answer the following questions giving reasons:
How many ovules are minimally involved?
Answer the following questions giving reasons:
How many ovules are minimally involved?
What do you understand by energy flow in an ecosystem? Explain the flow of energy through different trophic levels. Draw a diagram of a food chain.
i. Why must a cell be made 'competent' in biotechnology experiments? How does calcium ion help in doing so?
ii. State the role of 'biolistic gun' in biotechnology experiments.
ii. State the role of 'biolistic gun' in biotechnology experiments.