Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What shape does the exponential growth curve take when population density (N) is plotted against time (t)?
The context mentions: 'The above equation describes the exponential or geometric growth pattern of a population (Figure 11.3) and results in a J-shaped curve when we plot N in relation to time.'
Which of the following is considered a more realistic population growth model, especially for most animal populations in nature?
The context states: 'Since resources for growth for most animal populations are finite and become limiting sooner or later, the logistic growth model is considered a more realistic one.'
The logistic growth curve shows a specific sequence of phases. Identify the correct order of phases:
The context describes logistic growth as: '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.'
In the logistic growth model, what does 'K' represent?
The context explicitly defines K as 'K = Carrying capacity'.
For the Norway rat, the 'r' value is 0.015, and for the flour beetle, it is 0.12. What does this difference in 'r' values indicate?
The 'r' value is the 'intrinsic rate of natural increase'. A higher 'r' value indicates a greater potential for population growth. Since 0.12 (flour beetle) is greater than 0.015 (Norway rat), flour beetles have a higher intrinsic rate of natural increase.
The integral form of the exponential growth equation is $N_t = N_0e^{rt}$. What does $N_0$ represent in this equation?
The context states: 'Where $N_t$ = Population density after time t, $N_0$ = Population density at time zero, r = intrinsic rate of natural increase, e = the base of natural logarithms (2.71828)'.
What is the common term used for the S-shaped curve observed in logistic growth?
The context states: '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 (Figure 11.3)'.
When a population undergoing logistic growth reaches its carrying capacity (K), what happens to its growth rate ($dN/dt$)?
In the logistic growth equation, $dN/dt = rN((K-N)/K)$, when $N = K$, then $(K-N)$ becomes 0, making the entire expression for $dN/dt$ equal to 0. The context also mentions the asymptote 'when the population density reaches the carrying capacity'.
If a species is growing exponentially under unlimited resource conditions, what can be predicted about its population density in a short time?
The context states: 'Any species growing exponentially under unlimited resource conditions can reach enormous population densities in a short time.'
The anecdote about the king and the chess game (doubling wheat grains on squares) is used to dramatically demonstrate which concept?
The context explicitly states: 'The following is an anecdote popularly narrated to demonstrate dramatically how fast a huge population could build up when growing exponentially.'
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every Botany question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.